Current Trends and Challenges in Pharmacoeconomic Aspects of Nanocarriers as Drug Delivery Systems for Cancer Treatment

Sylwia Milewska; Katarzyna Niemirowicz-Laskowska; Gabriela Siemiaszko; Piotr Nowicki; Agnieszka Z Wilczewska; Halina Car

doi:10.2147/IJN.S323831

. 2021 Sep 28;16:6593–6644. doi: 10.2147/IJN.S323831

Current Trends and Challenges in Pharmacoeconomic Aspects of Nanocarriers as Drug Delivery Systems for Cancer Treatment

Sylwia Milewska ¹, Katarzyna Niemirowicz-Laskowska ^1,^✉, Gabriela Siemiaszko ², Piotr Nowicki ¹, Agnieszka Z Wilczewska ², Halina Car ¹

PMCID: PMC8487283 PMID: 34611400

Abstract

Nanotherapy is a part of nanomedicine that involves nanoparticles as carriers to deliver drugs to target locations. This novel targeting approach has been found to resolve various problems, especially those associated with cancer treatment. In nanotherapy, the carrier plays a crucial role in handling many of the existing challenges, including drug protection before early-stage degradations of active substances, allowing them to reach targeted cells and overcome cell resistance mechanisms. The present review comprises the following sections: the first part presents the introduction of pharmacoeconomics as a branch of healthcare economics, the second part covers various beneficial aspects of the use of nanocarriers for in vitro, in vivo, and pre- and clinical studies, as well as discussion on drug resistance problem and present solutions to overcome it. In the third part, progress in drug manufacturing and optimization of the process of nanoparticle synthesis were discussed. Finally, pharmacokinetic and toxicological properties of nanoformulations due to up-to-date studies were summarized. In this review, the most recent developments in the field of nanotechnology’s economic impact, particularly beneficial applications in medicine were presented. Primarily focus on cancer treatment, but also discussion on other fields of application, which are strongly associated with cancer epidemiology and treatment, was made. In addition, the current limitations of nanomedicine and its huge potential to improve and develop the health care system were presented.

Keywords: nanotechnology, pharmacology, pharmacoeconomic analysis, pharmacoeconomics, nanomaterials synthesis, clinical trials

Introduction

Nowadays, increasing evidence indicates that nanomedicine might have revolutionized therapeutic and diagnostic procedures, especially cancer treatment. This new technology provides a new toolset impacting the prevention of diseases by applying novel molecular diagnostic disease markers, early diagnosis of the neoplastic lesions in molecular imaging, and the treatment by enabling precise and effective therapies based on a personalized medication regimen.¹^,² Furthermore, there is evidence suggesting that combining nanomedicine with pharmacoeconomic evaluations could help reduce costs in managing cancer patients, for instance, by shortening the time of hospitalization or bringing down the number of necessary tests to be carried out. Another important fact worth mentioning is that the efficacy of drugs used with nanocarriers may substantially reduce cytotoxicity, preventing the occurrence of side effects by dose reduction and lower accumulation of therapeutic compounds in healthy body sites.³^,⁴ The considerations above provide a sound basis for holding nanotechnology in future medical developments capable of delivering highly efficacious and safe products. These new approaches should be available at reasonable costs and help restrict healthcare costs while maintaining clinical efficacy.³^,⁵

From a pharmacoeconomic point of view, the development of new drug substances and products such as nanosystems and their introduction into the pharmaceutical market could contribute to more affordable care. Specifically, the potential for reducing adverse events plays a significant role in new encapsulated therapeutics, which results in fewer medical procedures and leads to the reduction in personnel costs. It also gives greater chances of remission and allows patients to return to professional life.⁵^,⁶

Moreover, it should be emphasized that the application of nanotechnology in the medical field has many advantages since nanoparticles make a significant contribution as drug delivery systems due to their unique properties like the small size and large surface area.^7–9 The nanoformulation of drugs increases efficacy by enhancing the drug’s cellular uptake in the cellular targets; hence, it achieves better biodistribution. Nanosized formulations, in comparison with conventional forms of drugs, exhibit better control of drug release kinetics, which lead to an increased active concentration and bioavailability. Another important factor is that the nanodrugs could induce a marked suppression of tumor growth, prolongation of total survival time in cancer patients, and targeted delivery, which might enhance cytotoxic effects on neoplastic cells and restrict adverse effects in the whole body.¹⁰^,¹¹ All the above advantages make nanotechnology much cheaper than conventional therapies, which can also be reflected in the pharmacoeconomic aspect as the reduction or total avoidance of costs associated with medical (hospitalization, medical devices, monitoring therapy), and non-medical procedures (accommodation, transportation or the informal care).

It is worth noting that a broad literature review was undertaken. This paper presents existing evidence available regarding the effectiveness and expected pharmacoeconomic benefits of the alternative options of commonly used chemotherapeutic drugs to treat different types of cancers. Some factors may influence the results of the treatment regimen applied, such as patients’ age, stage of the disease, therapy onset, benefit duration, and also time to recurrence. Pharmacoeconomic analyses of alternative therapy options will improve decision-making and will help to optimize the use of already limited health care resources allocated to the care of cancer patients.¹² This paper aims to identify potential benefits from applying pharmacoeconomic to the rapidly evolving area of nanotechnology, especially in the domain of drug development for cancer treatment, which is presented in Figure 1.

Pharmacoeconomic impacts in biomedical nanotechnology.

Pharmacoeconomics – a Use Case of Nanocarriers Evaluation

Pharmacoeconomics is considered as a branch of health economics, which identifies, measures, and compares the costs and consequences of drug therapy for healthcare systems and society.^13–15 Moreover, it provides essential guidance on the management of limited healthcare resources and medical practice. Given the limited financial resources, health economics, particularly pharmacoeconomic analysis, is becoming a frequently used criterion for decision-making in modern healthcare policy.¹⁶^,¹⁷ Therefore, searching for novel therapeutic options characterized by high efficacy with restricted side effects remains a highly desired goal.¹⁸

Pharmacoeconomics applies the principles of health economics to the field of pharmaceutical policy. Also, it uses a broad range of techniques for health economic evaluation in the specific context of drug management.¹⁹^,²⁰ In effect, the introduction of novel forms of drugs, such as those encapsulated in carriers, lies in pharmacoeconomic purposes.

If think about conducting a pharmacoeconomic analysis, we should follow a clearly defined stepwise approach: a) Define the pharmacoeconomic problem – we should state the problem and select the objectives; b) Identify the perspective of the study – the most popular are: patients, provider, payer, and society; c) Identify the relevant interventions – we need to answer a significant question: “Have all relevant interventions been identified (including non-drug interventions)?”; Use decision trees or treatment models; d) Select the appropriate pharmacoeconomic method – CEA, CMA, CUA, CBA; e) Select the primary data source and study design – retrospective/prospective clinical trial data, economic (naturalistic) trial data; f) Select the secondary data sources – such as databases, literature, clinical expertise; g) Select appropriate analysis technique – modeling, meta-analysis; h) Identify the measures and the outcomes of alternative interventions – health outcomes and resource outcomes for beneficial as well as adverse effects; i) Use analytical methods – to establish the probability of outcome events and to answer the research question – such as efficacy rates, the incidence of adverse drug reactions, and decision trees; j) Estimate costs and effectiveness – reduce costs and outcomes; perform incremental cost analysis; k) Perform sensitivity analysis – determine the effect of varying uncertain variables over a range of results/assumptions; l) Interpret and present results – describe assumptions, methods, data sources; study limitations including significant omissions stated; interpret results.²¹

There are four most popular analyses to estimate the outcomes, and each of the methods is associated with a different type of pharmacoeconomic analysis, see Table 1.

Table 1.

Types of Pharmacoeconomic Studies.^21–24

Pharmacoeconomic Study	Description	Use Case	Example
Cost-minimization analysis (CMA)	To select the least costly among several similar interventions. • Applied when there is a need to compare multiple drugs of equal efficacy and equal tolerability. • Is performed when the outcomes are the same for the two interventions. • It cannot be used to evaluate programs or therapies that lead to different outcomes.	To identify the least costly option when outcomes/consequences are identical.	Compare costs of Drug A and Drug B (equal efficacy for a given condition and safety).
Cost-benefit analysis (CBA)	To identify, measure, and compare the benefits and costs of a program or treatment alternative. • The most comprehensive and the most difficult of all economic evaluation techniques. The benefits are assigned a monetary value so that costs and benefits can be easily compared. Different interventions can be compared – is a useful tool (like CUA) for resource allocation by policy-makers. • CBA should be employed when comparing treatment alternatives in which the costs and benefits do not occur at the same time. • Can be used to compare programs with different objectives - because all benefits are converted into currency and to evaluate a single program or compare various programs.	To compare programs or agents with different objectives or one program against a return on investment benchmark.	Clinical pharmacy service vs another institutional service.
Cost-effectiveness analysis (CEA)	To assist decision-makers in identifying the preferred choice among possible alternatives. • Used to evaluate multiple drug interventions for the same condition. The cost of drug treatments is weighed against the effectiveness of the drug. • The costs of drug treatments consist of acquisition costs, physician engagement, and nursing costs for administration of the drug. • The effectiveness of drug treatment is measured by the duration of treatment, length of hospital stay, and mortality rate. • The key measure of these evaluations is the incremental cost-effectiveness ratio (ICER).	To compare treatment alternatives for a given condition that differ in outcomes and costs.	Osteoporosis: Drug A vs Drug B on fracture risk reduction ($/fractures avoided).
Cost-utility analysis (CUA)	To compare medications or interventions with different outcomes. • Compare cost, quality, and the number of patient-years. • Used when programs and treatment alternatives should be compared. • CUA is applied less frequently than other economic evaluations because of the lack of standardization of measurement utilities, eg, difficulty comparing QALYs (quality-adjusted life-years) across patients and populations and difficulty quantifying patient preferences.	The same as CEA, useful when treatment extends life and/or affects the quality of life.	Compare cancer chemotherapy regimens.

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In pharmacoeconomic analysis, costs are crucial elements that should be taken into consideration. They can be classified as direct (medical and non-medical), indirect and intangible costs. Financial costs relate to monetary payments associated with the price of a good or service traded on the market. Economic costs match the broader concept of resource consumption, irrespective of whether such resources are traded in the market.¹³^,²⁴ In Table 2, we summarize and specify the types of costs that are considered in pharmacoeconomics. These costs together with the expected pharmacoeconomic efficacy measure when applying nanocarriers in cancer treatment are shown in Table 3.

Table 2.

Type of Costs in Pharmacoeconomic Analysis.¹³^,²²^,²⁴

Costs
Direct	Medical	1^a. Hospitalization 1^b. Outpatient visits (to primary care providers) 1^c. Procedures and tests (laboratory tests, surgical interventions, USG) 1^d. Medical devices 1^e. Homecare 1^f. Nursing care 1^g. Medications 1^h. Monitoring therapy 1ⁱ. Adverse events management 1^j. Medical staff costs 1^k. Administrative costs
Direct	Non-medical	2^a. Accommodation 2^b. Transportation 2^c. Non-medical services (home helper, meals on wheels, social assistance) 2^d. Devices and investments 2^e. The informal care
Indirect		3^a. Sick leave or absences (short term disability) 3^b. Reduced productivity at work (productivity loss) 3^c. Early retirement due to illness (long term disability) 3^d. The premature death
Intangible		Costs which are difficult to assess; a patient or their family might feel: 4^a. Anxiety 4^b. Pain 4^c. Suffering

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Table 3.

Efficacy of Selected Drugs and Expected Pharmacoeconomic Benefits Due to Their Nanoformulations.¹¹⁵^,^140–167

Nanocarrier		Efficacy	Expected Pharmaco-Economic Efficacy*
NP	Type of NPs	Doxorubicin
Chitosan-dextran conjugate NPs	P	Reduction of tumor size; Prolongation of survival.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Dox-loaded chitosan NPs	P	Marked inhibition of tumor growth; Prolongation of survival.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Dendrimer-Dox conjugates NPs	P	A single dose can cure mice with s.c. implanted colon cancer; The 100% survival of the tumor-bearing mice; A lower weight loss.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Peptide-Dox conjugates NPs	Pp	Marked inhibition of tumor cells in vitro; An effectiveness against a Dox-resistant neuroblastoma cell line.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Dox-loaded polymeric NPs	P	The greatest inhibition of primary human liver tumors implanted s.c.; Reduction in tumor growth; greater tumor inhibition and tumor necrosis; A marked reduction in the tumor collagen levels; A little to no toxicity to the mice.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PCMB-Dox NPs	P	Prolongation of survival; Suppression of tumor growth by about 80%; No toxic effects evidenced by histology, blood chemistries, and body weight.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Dox-loaded exosomes	E	Significant inhibition of tumors; No cardiotoxicity.	1^a-1^k,2^a-2^e 3^a-3^d.4^a-4^c
Paramagnetic NPs	M	A greater killing of cancer cells.	1^a-1^k,2^a-2^e 3^a-3^d.4^a-4^c
		5-Fluorouracil
SLNs	L	An improvement of the uptake of anticancer drugs inside colon tumors; Superior anticancer activity; Enhanced cytotoxic effects.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Chitosan-based NPs	P	Minimization of the toxic effects on healthy cells; An improvement of localization of the drug at the colon region; A decrease in drug-induced toxicity; A reduction of dose frequency and drug administration; A provision of better targeting efficiency and the accumulation of the drug.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PLGA NPs	P	The rate of cell lysis was about 80%; A prominent exhibition of an effect on target CRC cells.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
FA and PLGA conjugates	P	An enhancement of anticancer activity; The lowest cell viability.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Eudragit S100 coated CPNs	P	A better targeting efficiency; An exhibition of drug release over a prolonged period.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
SiNPs	M	An enhancement of cellular uptake; An improvement of cytotoxic effects.	1^a-1^k,2^a-2^e, 3^a-3^d,4^a-4^c
		Paclitaxel
PLGA-NPs	P	Minimal systemic toxicity; Significantly better tumor growth inhibition effect with transplantable liver tumors; Facilitation of drug cell uptake; An increase in cellular association; An enhancement of cytotoxicity; Inhibition of intimal proliferation in a rabbit vascular injury model; A significant prolongation of survival; Improvement of drug encapsulation efficiency; Better control of drug release kinetics; An enhancement of cellular uptake; Better antitumor efficacy.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PLA NPs	P	Significant antitumor efficacy; More drug accumulation in tumors.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PCL NPs	P	An enhancement of cytotoxicity; A remarkable tumor growth inhibition; An enhancement of antitumor efficacy; No acute toxicity; An increase in cellular uptake; An enhancement of toxicity; An improvement of tumor inhibitory activity.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PEG-PCL NPs	P	An improvement of the pharmacokinetic profile; An increase in the mean survival time; Better drug loading profile; An improvement in entrapment efficiency to 98%; Significantly greater tumor accumulation.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PVP-b-PCL or PCL-g-PVA	P	Significantly superior antitumor efficacy; An exhibition in reduction of drug release rate profiles; Better antitumor activity.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
HO-GC	P	Faster cellular uptake; Better therapeutic efficacy; An enhancement of the aqueous solubility; Achievement of a higher drug loading up to 20%; Achievement of maximum entrapment efficiency of 97%.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
mPEG-CHO-chitosan NPs	P	Significantly slower tumor growth rate; An improvement of life span.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
LyP-1-Abraxane NPs	Pp	A significant improvement of antitumor efficacy.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
BSA NPs	Pp	High stability; Surface properties which specifically targeted to human prostate cancer cells.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
OSA NPs	Pp	An improvement of the lipophilicity of albumin; Higher drug entrapment efficiency; Greater stability.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
HA-NPs	P	A superior antitumor efficacy; An achievement of the drug loading up to 20.7%.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
PBCA-NPs, (HA)-PBCA-NPs	P	A gradual drug release up to 80% within 96 h; Reduction of the initial burst release of the drug; A decrease in the cytotoxicity; An enhancement by cellular uptake; More potent antitumor inhibition activity.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
HPG-C10-PEG, PEI-C18-HPG	P	Drug release up to 80%; Better tolerance; A significant exhibition and improvement of antitumor efficacy; A decrease in cytotoxicity.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
PEG-PE NPs	P	Better antitumor activity; An improvement of antitumor efficacy.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
Gelatin NPs	P	A significant improvement of antitumor activity.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
NK 105	P	A significant better antitumor efficacy; Dramatically lower neurocytotoxicity.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Liposomes	L	A significant better antitumor efficacy; Greater tumor uptake; Reduction of toxicity; Significantly smaller tumor volumes; Inhibition of metastasis.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
SLNs	L	Increased cellular uptake; Optimization of the drug entrapment efficiency; A significant enhancement of toxicity; An increase in brain uptake; Slower tumor growth rate; Potential to overcome P-gp-mediated MDR.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Lipid Nanocapsules	L	A significant increase in the life span; Potential to overcome P-gp-mediated MDR; An increase in drug cell uptake and retention; An increase in drug loading and entrapment efficiency; Prolonged and sustained in vitro release; An exhibition of better antitumor efficacy.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
PTX Fatty Acid-Prodrug Lipid-Based NPs	L	Tumor growth inhibition; Antitumor activity; Less toxic; A significant improvement of drug loading efficiency; A superior anti-tumor efficacy.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Micro- and Nano-Emulsions	L	Much better tolerance; A significant improvement of antitumor efficacy; An increase in the life span; An extended release; Greater bioavailability.	1^a-1^k,2^a-2^e 3^a-3^d,4^a-4^c
Drug-Polymer Conjugates	P	A significantly better antitumor efficacy; A remarkable enhancement of tumor inhibitory activity; Low toxicity; Superior antitumor activity; Complete elimination of tumors (in some cases); Prolonged circulation time.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
MNPs	M	An enhancement of cell inhibition activity; Low toxicity.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
CNTs	C	A significant improvement of antitumor activity; An increase in drug loading; A significant increase in cell death; Non-toxicity.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
CD NPs	P	Low haemolysis and cytotoxicity.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
Nanogel	P	A significant improvement of antitumor efficacy.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c
ANG 1005	Pp	Better antitumor efficacy; An increase in survival time.	1^a-1^k, 2^a-2^e 3^a-3^d, 4^a-4^c

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Note: *Based on Table 2.

Abbreviations: ABCB1 gene, ATP Binding Cassette Subfamily B Member 1; ANG 1005, Angiopep-2 Paclitaxel Conjugate; BSA, Bovine Serum Albumin; C, carbon-based nanoparticles; CD NPs, Cyclodextrin Nanoparticles; CNTs, Carbon Nanotubes; CRC, Colorectal Cancer; Dox, Doxorubicin; E, exosomes-based nanoparticles; Eudragit S100, Anionic Copolymers based on Methacrylic Acid and Methyl Methacrylate; HA, Hyaluronic Acid; (HA)-PBCA-NPs, Hyaluronic acid coated poly(butyl cyanoacrylate) nanoparticles; HO-GC, Hydrotropic Oligomer-Conjugated Glycol Chitosan; HPG, Hyperbranched Polyglycerol; HPG-C10-PEG, Hyperbranched polyglycerol-C10- poly(ethylene glycol); i.v., intra venosa; L, lipid-based nanoparticles; LyP, 1-Abraxane - type of peptide; M, metallic-based nanoparticles; MNPs, Magnetic NPs; MDR, Multidrug Resistance; mPEG-CHO-chitosan NPs, Methoxypoly(ethylene glycol) conjugated Chitosan Nanoparticles; NK 105, Paclitaxel-incorporating Micellar Nanoparticle Formulation; PEG, polyaspartate micellar NPs; NPs, Nanoparticles; s.c., subcutaneously; OSA, Octyl-modified bovine Serum Albumin; SiNP, Silica Nanoparticles; SLNs, Solid Lipid Nanoparticles; P, polymeric-based nanoparticles; PBCA, Poly(butyl cyanoacrylate); PCL, Poly(ε-caprolactone); PCMB-Dox NPs, PEGylated Carborane-Conjugated Amphiphilic Copolymer Doxorubicin Nanoparticles; PEI-C18-HPG, Polyethyleneimine (PEI)-C18-HPG; PEG-PCL, Poly(ethylene glycol)-Poly(ε-caprolactone); PEG-PE Nps, Poly(Ethylene Glycol)-Phosphatidyl Ethanolamine Nanoparticles; P-gp, Permeability glycoprotein; PLA, Polylactide; PLGA, Poly(lactic-co-glycolic acid); PLD, PEGylated Liposomal Doxorubicin; PLMB-Dox NPs, Doxorubicin-Loaded Carborane-Conjugated Polymeric Nanoparticles; Pp, peptide-based nanoparticles.

For any pharmacoeconomic analysis, the perspective is critical since it determines what costs and benefits will be measured: 1. Societal – all costs and consequences that occurred during the treatment, 2. Third-party payer–payers are represented by insurance companies, employers, or the government; the direct costs are included, but also indirect costs can also be included, 3. Hospital/physician (healthcare providers) – providers include hospitals, private-practice physicians, or managed-care organizations; from this perspective, direct medical costs are included, 4. Patient – all costs borne by the patient for any product or services and are not covered by any insurance; there are direct, indirect, and intangible costs (out of pocket). According to the aforementioned, those costs/analysis should be taken into consideration if we are thinking about the safe application of nanocarriers in modern therapy.¹³^,²⁵

The Cancer Burden in the World

The National Cancer Institute defines cancer as a set of diseases in which abnormal cells divide without control and can spread to various tissues. Cancers can manifest in different parts of the body – leading to a range of different cancer types.²⁶ Based on the available data, it is assessed that cancer is one of the leading causes of death. In 2018, 9.6 million people were estimated to have died of various forms of cancer. Globally, WHO roughly estimates that 1 in 6 deaths is due to cancer. Considering the income – approximately 70% of deaths from cancer occur in low- and middle-income countries. The most common cancers, in terms of frequency and number of deaths, are lung, breast, and colorectal.²⁷

Cancer burden is associated with risk factors belonging to three main groups, which are: socio-economical, life-style, and genetic/health predisposition comprising prolonging and chronic inflammation caused by the existence of microbial infections. Besides the fact that microbes might induce chronic inflammation, it was evidenced that they are able to produce carcinogenic bacterial metabolites, which caused mutation of genetic materials.²⁸ It means that disturbance in one of these groups triggers a cascade of processes leading to the development of cancer. Researchers have found several risk factors that may increase the chance of getting lung, breast, and colorectal cancer (Figure 2).

The burden of cancer: risk factors and the frequency of diagnosed cases and deaths (in the center³⁵).

In the case of lung cancer, the number one risk factor is smoking. People who smoke cigarettes are about 15, even up to 30 times more likely to get or die of lung cancer than people who do not smoke. Smoking only a few cigarettes a day or occasionally increases the risk of developing lung cancer. The longer a person smokes, and the more cigarettes are smoked each day, the more risk becomes apparent. It is a misleading belief that smoking can only cause lung cancer. Smoking also causes several other neoplasms, such as cancer of the mouth and throat, esophagus, stomach, colon and rectum, liver, pancreas, kidney, urinary bladder, and even acute myeloid leukemia.²⁹ Moreover, it should be emphasized that tuberculosis, pneumonia, and chronic bronchitis are examples of pathology, which have a profound role in the emergence of cancer. In effect, in the case of lung cancer, prolonging microbial infections are major inflammation-inducing factors, which is known to be the cause of cancer development.³⁰

Risk factors for breast cancer can be divided into modifiable and non-modifiable.³¹ To have a lower risk of getting breast cancer, every woman should be physically active and keep the body weight normal, if possible – avoid taking contraceptives and hormone replacement therapy, have the first pregnancy before age 30, breastfeed, and have a full-term pregnancy. Smoking, being exposed to chemicals, drinking alcohol, and having changes in other hormones due to night shift working may also increase breast cancer risk.³¹ Non-modifiable risk factors include age, genetic mutations, reproductive history, dense breasts, personal and family history of breast cancer, and previous treatment using radiotherapy. Important is the fact that there is evidence linking chronic inflammation, which might be caused by microbial infection, to breast cancer risk, development and progression.³² For instance, it is established that breast cancer was one example of among other 15 incident cancer, in which the risk of developing one year after Staphylococcus aureus bacteremia (SAB) was significantly increased compared to the general population.³³ Screening for this aspect in cancers in populations with developed SAB infection might allow for earlier disease detection. Additionally, the presence of chronic infection also affects the human microbiota. Recent studies have found that people who have a good response to immunotherapy to treat their cancer appear to have a different microbiome composition than those who do not respond that well.³⁴

The risk of getting colorectal cancer increases as the patient gets older.³⁶ About 90% of cases occur in people in their 50s or older. Other risk factors include inflammatory bowel disease (Crohn’s disease, ulcerative colitis), a personal or family history of colorectal cancer or colorectal polyps, and a genetic syndrome, such as hereditary non-polyposis colorectal cancer (Lynch syndrome).³⁶ Moreover, in recent decades, there has been accumulating information in the published literature about the link between CRC and microbial infection. It has been announced that both viruses and bacteria can cause CRC via prolonged infection and accompanying inflammation, as well as induction of mutagenesis that leads to uncontrolled epithelial cell proliferation. Based on data from clinical and laboratory trials, among the aforementioned microbial agents, a crucial role was noted for Streptococcus bovis, Helicobacter pylori, Escherichia coli, Klebsiella pneumoniae, and Fusobacterium.³⁷

It should be kept in mind that lifestyle factors may also contribute to an increased risk of colorectal cancer, such as lack of regular physical activity, low amount of fruit and vegetables in the diet, a low-fiber and high-fat diet or a diet high in processed meat, overweight and obesity, alcohol consumption and tobacco use.³⁶

Noteworthy is the fact that between 30% and 50% of cancers can be prevented by avoiding risk factors and implementing existing evidence-based prevention strategies. Cancer burden can also be reduced by early detection of cancer and the management of patients who develop cancer. Many cancers are curable if they are diagnosed early and treated properly.³⁸ Additionally, it should be emphasized that inflammation is often associated with cancer development and progression.³⁹ The triggering of chronic inflammation that increases cancer risk includes bacterial infections. In effect, the application of nanotechnology products that possess proved antimicrobial properties might have important implications for cancer preventions (Table 4).

Table 4.

The Examples of Nanotechnology-Based Applications with Proved Antimicrobial Properties

Nanoparticles	Microbe	Mode of Action	Ref.
Metal and metal oxide NPs: 1. Ag NPs 2. BiOBr NPs with Fe³⁺	Staphylococcus aureus MRSA	Disruption of the bacterial cell wall. Stops cell division by interaction with both DNA and RNA. Disruption of signal transduction, and ROS generation.	[40–43]
Carbon-based NPs: 1. GO 2. GO with curcumin 3. CNFs 4. NCQDs		Penetration of cell membranes. A significant enhancement of the anti-MRSA. Activity due to the illumination of LED lights. The positively charged NCQDs interacted with negatively charged bacteria and then anchored specifically to particular sites on the surface of MRSA.	[40,41,44,45]
Liposomes: 1.liposomal vancomycin 2.exosomal linezolid		Liposomal vancomycin (in comparison to free form) adequately accumulated vancomycin levels in the macrophages and exhibited a remarkable bactericidal effect against MRSA intracellularly. The in vivo assessment of exosomal linezolid (vs free linezolid) showed superior activity against intracellular MRSA.	[40,46–48]
Polymeric NPs: 1.diblock guanidinium polymer 2.encapsulation of vancomycin in the amphiphilic self-assembled supramolecular vesicles 3.C1-PNPs with gentamicin or ciprofloxacin 4.PEG-PLGA with Eudragit E100 and chitosan		The system is able to target macrophages, release an antibiotic inside the cell, and consequently increase the effectiveness against intracellular MRSA. Restore MRSA sensitivity to antibiotics as C1-PNPs increased the cellular uptake of gentamicin by MRSA and inhibited the MRSA efflux mechanism for ciprofloxacin. Target macrophages in an efficient way and also to improve the delivery of vancomycin to MRSA inside the cells, and conclusively improved the antibacterial activity of vancomycin on intracellular MRSA.	[40,49,50]
Silica NPs: 1.Gentamicin-loaded mesoporous silica NPs		The system is able to release loaded gentamicin upon the bacteria’s presence followed with the bacterial toxins-caused degradation of the shell and thus could be used to treat the intracellular MRSA.	[40,51]
Polydopamine-based NPs: 1.PDA-PEG-Van NPs		High targeted antimicrobial activity against MRSA when exposed to NIR low-power radiation.	[52]
Metal and metal oxide NPs: 1.Mg(OH)₂ NPs	Streptococcus bovis	The mechanism of antimicrobial action of oxide NPs involves the production of active oxygen species which are known to induce bacterial cell death. The effect of MgO is stronger against Gram(+) bacteria than Gram(-) bacteria, most likely because of differences in bacterial membrane structure.	[53]
Metal and metal oxide NPs: 1.AG NPs 2.Tv-Ag NPs	Helicobacter pylori	Generation of ROS (oxidative damage) and exhibits antimicrobial and antibiofilm activity.	[54,55]
Noble metal NPs: 1.GNR@LDH-PEG NPs 2.GNSs 3.Tri-Ag NPs 4.dvPtNPs	Escherichia coli	NIR irradiation - thermally kill at least 99.99% of E.coli. Concomitant release of ROS and chemotherapeutic Pt²⁺, resulting in tri-model (photothermic/photodynamic/chemotherapeutic) antibacterial activity against E.coli.	[56,57]
Metal sulfide/oxide NPs: 1.CS@MoS₂ 2.MoS₂/PDA-RGD 3.CuS NPs 4.MnO₂ NPs	Escherichia coli	Photothermic and photodynamic effects of chitosan-assisted MoS₂ (CS@MoS₂), resulting in the inhibition of 99.84% of E.coli. MnO₂ can have interaction with GSH in bacteria and convert into Mn²⁺, not only destroying the oxide balance of bacteria, as well as avoiding long-term body retention.	[56]
Polydopamine-based NPs:		Specific interaction with bacteria and showed that under NIR radiation induced a temperature rise to 45 ^°C could cause a marked bacterial death.	[52]
1.PDA-coated polystyrene/silver NPs 2.PDA-modified magainin NPs			[52]
Carbon-based NPs: 1.rGO-Au NPs	Klebsiella pneumoniae	Captured the bacterial cell wall membrane, and Au NPs destroyed the outer coating of the bacterial cell wall.	[41]
Metal and metal oxide NPs: 1. Ag NPs 2. GSH-Ag NPs	Fusobacterium	An exhibition of improved antimicrobial activity due to their enhanced surface-to-volume ratio. Trigger inflammatory response in human gingival fibroblasts by the increase of cytokine production.	[58,59]

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Abbreviations: Ag NPs, silver nanoparticles; BiOBr NPs, polyethylenimine grafted bismuth oxybromide nanoplates with Fe³⁺; C1-PNPs, pyridinium amphophile-loaded PLGA (poly (lactic-co-glycolic acid) nanoparticles; CNFs, carbon nanofibers; CS@MoS₂, chitosan-assisted MoS₂; CuS NPs, copper sulfide nanoparticles; dvPtNPs, dualvalent platinum nanoparticles; GNR@LDH-PEG, poly(ethylene glycol) (PEG) modified core-shell GNR@ (gold nanorod) layered double hydroxide nanoparticles; GNSs, gold nanospheres; GO, graphene oxide; GSH, glutathione; GSH-Ag NPs, glutathione-stabilized silver nanoparticles; MDR, multidrug-resistant; MIC, minimum inhibitory concentration; Mg(OH)₂ NPs, magnesium hydroxide nanoparticles; MnO₂ NPs, manganese oxide nanoparticles; MoS₂/PDA-RGD, molybdenum disulfide/polydopamine-arginine-glycine-aspartic acid; MRSA, methicillin-resistant Staphylococcus aureus; NCQDs, nitrogen-doped carbon quantum dots; NIR, Near-infrared irradiation; NPs, nanoparticles; PCE, tetrachloroethene; PDA-PEG-Van NPs, polydopamine-based nanoparticles modified with PEG and vancomycin; rGO-Au NPs, reduced-graphene-oxide functionalized with gold nanoparticles; ROS, Reactive Oxygen Species; Tri-Ag NPs, citrate-coated triangular nanoparticles; Tv-Ag NPs, toxicodendron vernicifluum silver nanoparticles.

Adequate prevention measures and early detection and treatment might substantially reduce cancer mortality rate. There are two components for efficient detection: 1. Early diagnosis – cancer that is diagnosed at an early stage, when it is not too large and has not spread, is more likely to better respond to effective treatment and can result in a greater improvement in survival rates, decrease in mortality, and less expensive treatment; 2. Screening – aims to detect cancer before the symptoms appear. The definition says that it is the presumptive identification of unrecognized disease or defects through tests, examinations, or other procedures that can be applied rapidly.⁶⁰

However, implementation of the above preventive measures mentioned above in most cases cannot be accomplished due to the failure of systemic approaches.

Different Aspects of the Use of Nanocarriers – Prevention, Diagnostic and Therapeutic Application

Recently, increasing evidence demonstrates that nanoparticle-based targeting strategy is effective and promising at a diagnostic and therapeutic level and might include many kinds of cancers, such as colorectal cancer, breast cancer, ovarian cancer, or lung cancer.⁶¹^,⁶² Nanotechnology can be used in the prevention of disease, diagnosis, and treatment, especially by enabling early disease detection and diagnosis, as well as a precise and effective therapy, which is vital for developing personalized treatment strategy. In effect, implementing the aforementioned new concept of personalized medicine potentially offers an efficient cure for virtually any type of malignancy. Various applications of nanotechnology concerning prevention, diagnosis and treatment fields of use are shown in Figure 3.

Many types of nanodevices could be clinically applicable, in different kinds of detection, such as imaging contrast agents, immunoassays, or targeted drug delivery systems. In Table 5, commonly used nanodevices and their primary areas of application are presented.

Table 5.

Types of Nanodevices Used in Clinical Application

	Cantilevers	Carbon Nanotubes	Dendrimers	Nanocrystals	Nanoparticles	Nanoshells	Nanowires	Quantum Dots
Cellular imaging								x
Contrast agents used in diagnostic imaging (eg MRI, ultrasound)			x		x^a
Detection of disease protein biomarkers		x
Detection of disease protein biomarkers	x						x^b
Detection of DNA mutation	x	x					x^c
Detection of Gene expression	x						x^d
Detection of infectious agents by DNA hybridization					x
Detection of Neurotransmitters								x
Formulation improvement for poorly soluble drugs				x
High-throughput screening	x						x^a
Imaging of tumors and lymph nodes								x
Immunoassays					x^c
Immunohistochemical assays								x
Indicators of apoptosis, angiogenesis					x^b
Multiplexed diagnostics; immunoassays								x
Optical detection of genes and proteins								x
Targeted diagnostic imaging of tumors						x
Targeted drug delivery, permeation enhancers					x
References	[1,63–65]	[1,63,64]	[1]	[1]	[1^a,⁶³^,⁶⁴^,⁶⁶^b–⁶⁸^c]	[1]	[1,63^a,⁶³^b,⁶⁴^,⁶⁷^c,⁶⁹^d]	[1,67,70–72]

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Treatments Using Drug Delivery Systems

An accurate cancer diagnosis is essential for adequate and effective treatment because each type of cancer requires a specific treatment regimen that encompasses one or more actions, such as surgery, radiotherapy, and chemotherapy. Determining treatment goals and palliative care is an essential first step, and health services should be integrated and patient-oriented. The fundamental aim is to cure cancer or to prolong life. Improving the patient’s quality of life is not insignificant, and it can be achieved by supportive or palliative care with minimization of side effects of drugs as well as via psychosocial help.⁷³

Nanocarriers used in drug delivery systems are typically about a size below 500 nm. They are made of organic (lipid, liposome, dendrimer, polymeric) or inorganic (carbon nanotubes, iron oxides, metallic) materials, as well as their hybrids of varying sizes, shape, and surface characteristics.⁷⁴ Examples of the most widespread anticancer drugs as part of drug delivery systems, specifying the nanocarriers and type of cancer, are presented in Figure 4.

To achieve targeted drug delivery with maximum pharmacokinetic activity at pathology sites, constant progress in drug delivery systems using nanotechnology strategies has been noted. The use of drug carriers offers several benefits in terms of the chemical and biological properties of the drug. From a chemical point of view, the application of nanocarriers exerts an impact on drug solubility and penetration ability. Moreover, surface characteristics, immobilization of homing molecules, as well as the sensitivity of carriers to different stimuli determine specific-site delivery, modulate drug release, exert the impact on biodistribution and retention process, as well as influence the immunomodulatory properties of carriers. The above-mentioned features show that a strong association between physicochemical and biological properties exists.

Improving Drug Solubility

The most crucial goal of nanoencapsulation is to solve the problem of poor drug solubility.⁷⁴ The majority of the currently used drugs are poorly water-soluble molecules, which is why various methods of immobilization and encapsulation of drugs in nanoparticles are used to increase their bioavailability. Drug solubility can be increased by the supplementation of additives (DMSO), which, however, can be toxic even at low doses.⁷⁵ From the pharmacoeconomic point of view, insoluble drug delivery technologies have many benefits, including reduction of dose and related toxicity, improved formulation, cost reduction, patent protection, or patient compliance.⁷⁶

Nanocarriers for hydrophobic drugs delivery are most often built of biodegradable monomers or preformed polymers (polymeric nanoparticles), amphiphilic building blocks that due to their organization create structures having the drug located in the hydrophobic interior of a hydrophilic vehicle (polymeric micelles, liposomes), or are structures exhibiting the guest-host properties (dendrimers, carbon nanotubes).

Polymer nanoparticles can be divided due to their organization into (1) nanospheres in which the drug is trapped or dispersed in a polymer matrix, and (2) nanocapsules that consist of a drug dissolved or dispersed in an oily or aqueous core that is surrounded by a solid polymer membrane. A plethora of drugs, including anticancer (Paclitaxel, 5-Fluorouracil), anti-inflammatory (Ibuprofen, Diclofenac), and antibiotics (Rifabutin, Benzathine penicillin G) are described as formulations based on polymeric nanoparticles. A number of PNPs bearing hydrophobic anticancer drugs are at various stages of clinical trials.⁷³^,⁷⁴

In another of the strategies involving the use of polymeric micelles, water-insoluble drugs exhibit affinity for the hydrophobic region of micelles formed from diblock hydrophobic-hydrophilic polymers. As a result of drug encapsulation, a hydrophilic nanocarrier is created, which due to the typically low critical micelle concentration, remains stable even after dilution by body fluids. Drug-containing polymeric micelles, such as Genexol PM^® containing Paclitaxel, already exist on the market.⁷⁶

Another example of delivery of poorly soluble drugs is the liposomal formulation, where lipophilic drugs can be dissolved in the lipid segment of the phospholipid bilayer membrane. Liposomal carriers are very flexible when it comes to their structure and functionality. Lipid formulations of anticancer drugs have been successfully marketed, such as Endo^®-TAG-1 which is a product containing Paclitaxel that uses positively charged phospholipid vesicles for pancreatic cancer treatment.⁷⁷^,⁷⁸

Finally, hydrophilic dendrimeric polymers are recognized as suitable carriers because drugs can be encapsulated in their interior. The presence of empty cavities can be controlled by affecting the polymer conformation by changing the pH, the type of solvent, as well as the design of the polymer structure itself. At the same time, the encapsulation mechanisms can utilize electrostatic, hydrophobic, acid-base interactions, or hydrogen bonds between the drug and the polymer. Although there is no dendrimer-based product on the cancer drug market, research shows that some known dendrimeric vehicles are good candidates. For example, it was reported that polyamidoamine branched polymers with hydrophobic Paclitaxel, in addition to better drug solubility, showed 10-fold higher anticancer activity compared to free drug, which is attributed to better uptake by tumor cells.⁷⁹

Interestingly, in the latest literature, there are such bioinspired solutions for drug delivery as the use of amphiphilic proteins to stabilize the hydrophobic drug and induce biosilicification on its surface, which leads to the formation of drug-core silica-shell nanoparticles.⁸⁰

Other interesting examples are hydrogels, biocompatible crosslinked hydrophilic polymer networks already well known for being a good hydrophilic drug delivery system, which can be modified to encapsulate hydrophobic drugs, for example, by having hydrophilic moieties or molecules having empty cavities in their structure, or even containing polymeric micelles or nanoparticles with the encapsulated drug.⁸¹

Targeted Drugs Delivery – the Passive and Active Crossing of Biological Barriers

A key element for the effectiveness of the drug is to successfully access diseased sites. This can be improved or enabled by the use of nanosized drug delivery systems, which themselves are capable of crossing biological barriers or allow the encapsulated drug to traverse them to achieve maximum effect at the target. Depending on the method of administration (intravenous, oral, or inhalation), the nanocarrier must cross various barriers on the way to the tissues or organs and subsequently to the cells or organelles, which takes place via two modes of transport, “passive” and “active”. Targeted drug delivery systems (TDDSs) have many advantages, including (1) reducing the exposure of healthy cells to cytotoxic compounds, (2) overcoming the increasingly common drug resistance of tumors, and (3) reduction of side effects of therapy, which directly translates into profits from a pharmacoeconomic point of view.⁸²

“Passive”, non-specific targeting is associated with reduced nanoparticle sizes and surface properties, such as hydrophobicity, surface charge, or non-specific adhesion, which may result in reaching organs having porous endothelial capillaries (liver, spleen), helping to cross specialized epithelial, and penetrating the cell cytoplasm.⁸³ For example, in the case of cancer, the phenomenon of increased permeability and retention (EPR effect) can be observed, which is based on selective penetration into cancer cells compared to normal tissues due to the size of nanoparticles. This is caused by the leaky nature of the tumor-bearing blood vessels that have endothelial cell linings of 100 to 700 nm, which is 10- to 70-fold more than the normal endothelium. This, combined with the weak drainage system typical of solid tumors, leads to the accumulation of drug-loaded nanoparticles in the neoplasm.

Furthermore, due to the increased metabolism of tumor cells, their surroundings are characterized by acidic pH and slightly increased temperature, which can be used in the design of stimuli-responsive nanocarriers. Finally, tumors will release specific enzymes, such as metalloproteases, into their adjacent environment, which in addition to function as tumor markers, can also be recognized by functionalized drug delivery systems.⁷³

Unfortunately, for some organs, the delivery of drugs passively using nanosystems is significantly impeded due to the poor permeability of biological barriers, such as the blood–brain barrier (BBB). In these cases, “active” transport methods can improve traversing through membranes.⁸⁴ “Active targeting” relies on the increased selectivity of the drug-loaded nanocarrier through its surface functionalization with a ligand showing an affinity for the pathological site. Such ligands, including antibodies, peptides, proteins, glycoproteins, growth factors, nutrient compounds, vitamins, or nucleic acids, are bound by receptors that are overexpressed on cancer cells. Then, receptor-mediated endocytosis ensures cellular uptake of nanocarriers providing higher drug concentration in the cytoplasm.⁷³ An interesting example of a ligand is folic acid, whose receptor (FR) is overexpressed in many types of cancer, such as breast, lung, ovarian, and colorectal tumors.⁸⁵ Among classical targets, there are transferrin receptors (TfR) or nicotinic acetylcholine receptors typical for the vasculature of brain tumors.⁸⁶

Furthermore, targeting tumor endothelium on which there are numerous moieties, such as vascular endothelial growth factors (VEGFs) or vascular cell adhesion molecules (VCAMs) can be a complementary strategy to drug delivery, as it involves the destruction of endothelial walls, and thus cutting off oxygen and nutrient access leading to cell death.⁷³

Another advantage of nanocarrier functionalization is the conjugation of the carrier with a fluorescent marker that allows tracking of both the carrier and the drug in vitro and in vivo studies, which can be used in theranostics.⁸⁷

Nowadays, most of the clinical trials using nanocarriers apply “passive” transport,⁸⁵ and the use of the EPR effect in the design of drug delivery systems has become standard. Some of these products are commercially available, such as Doxil^®, a liposomal formulation of the cytotoxic Doxorubicin, or Caelyx^®, a PEGylated liposomal formulation of this drug. Besides, many studies are documenting the in vivo antitumor activity of nanosystems using an “active” mechanism of cell penetration, and some of them are at the clinical trials, including a liposomal nanoplatform containing Doxorubicin with scFv antibody as a ligand targeting the human epidermal growth factor (HER2) receptor in advanced breast cancer, and a polymeric nanoplatform having Docetaxel with nucleic acid-based protein-ligand (ACUPA) targeting prostate-specific membrane antigen (PSMA) in solid tumors.⁸⁶

Increasing Drug Stability and Controlled Release

Drug delivery systems (DDSs) have many advantages over using free medicines. Often, one type of carrier significantly improves a given therapy by improving several chemical properties of the formulation, thereby increasing the stability of the formulation and drug during storage, the stability of the formulation in vivo, and also allowing for prolonged release of the drug.

Maintaining the unchanged properties of the drug during storage and extending its suitability for use in the drug delivery systems can be very helpful. For example, it was reported that a carrier made of cyclodextrin could result in increased thermal stability and reduced drug volatility.⁸⁸ Another case was described by Hsiao and coworkers, who showed that chlorophyll, a valuable bioactive compound known for its sensitivity to oxygen, high temperature, and light, has been encapsulated in polycaprolactone, gaining greater stability and therefore being more convenient for storage.⁸⁶

The drug delivery system can lead to increased drug stability in vivo and protect it from degradation before and after it gets into systemic circulation by decreasing metabolic clearance in blood and gastrointestinal tract (GIT) or renal reticuloendothelial system (RES) clearance. However, it is very important to maintain constant nanoparticle parameters, such as size, morphology, size distribution, porosity, or crystallinity, because their disturbance can lead to altered pharmacological properties of the drug-loaded nanosystem. Some active moieties, such as DNA or siRNA, possess disadvantaged physicochemical properties (molecular weight, charge, susceptibility to degradation by enzymes) and have to be applied clinically together with appropriate nanocarriers.⁸⁸^,⁸⁹ Specifically, in the case of immobilization of enzymes on nanocarriers, in addition to increased stability, they are attributed to such benefits as reduced protein degradation, resistance to mass transfer, high mechanical strength, and minimum diffusional problems.⁹⁰ One should also mention the “stealth” technology used for liposomes, which consists of attaching a synthetic polymer poly(ethylene glycol) (PEG) to the liposome structure. This modification extends the presence of intact pegylated nanocarriers in the blood through reduced uptake by the mononuclear phagocyte system (MPS).⁹¹

The formulation must be stable to external factors mimicking conditions in the body, and therefore without the evaluation nanomaterials cannot be used clinically.⁸³ For instance, Villamizar-Sarmiento et al carried out a comprehensive study and confirmed that the prepared nanomedicines based on poly(styrene sulfonate) polymer had unchanged hydrodynamic sizes and zeta potential for over a dozen days at a varying salt concentration (NaCl), pH, and temperature, and was durable despite freeze-drying and redissolving in water.⁹² Similarly, Kanwar et al studied structural changes of nanostructured lipid carriers (NLCs) under stress conditions, such as changing electrolyte concentration, pH, and stabilizing polymer addition. Interestingly, NLCs are resistant to changes in the environment, which is important for their pharmaceutical applications.⁹³

The immobilization of a drug, both hydrophobic and hydrophilic, helps to ensure its controlled slow-release and avoid burst effect, which would not have been possible without the carrier.⁹⁴ As a result of slow controlled drug release, the active substance has a prolonged circulation in the body and is released at pathological target sites. In one of the strategies, due to the specific chemical properties of the designed nanocarrier, its durability can be controlled in vivo by local stimuli, such as abnormal pH,⁹⁵ temperature,⁹⁶ or ionic strength⁹⁷ (so-called stimuli-responsive materials). For instance, Guo et al reported the synthesis of carriers consisting of cationic liposomes coated with carboxymethyl chitosan, stable under physiological conditions, but in an acidic environment specific to the tumor (pH=6.5) quickly transformed into a cationic form, which aided tumor-specific cellular uptake. Moreover, in the presented studies synergistic use of two active molecules, the anti-cancer drug (doxorubicin) and oncogenic protein inhibitor (MDM2), was possible using the dual-drug delivery system.⁹⁸ Recently, Razavi et al described multi-stimuli-responsive block copolymers based on poly(N-(2-(dimethylamino)ethyl)-methacrylate) (PDMAEMA) and poly(methyl methacrylate) (PMMA) chains terminated with spiropyran, wherein the size of the nanoparticles, as well as the release of doxorubicin, was controlled through pH, light, and temperature.⁹⁹

The Efficiency of Encapsulation/Immobilization of Drugs in Carriers

From a pharmacological point of view, it is important to ensure efficient drug encapsulation to avoid such in vivo side effects of the use of nanocarriers in excess such as agglomeration resulting in excretion from the body by the immune system, high blood pressure, renal failure or systemic toxicity.¹⁰⁰ Unfortunately, the majority of currently known drug delivery systems are characterized by a low loading efficiency (less than 10%), which is associated with the use of a large amount of carrier.¹⁰¹ To achieve good loading efficiency, the kind of materials used (characterized mainly by a large surface area) and their surface modification and the method of drug encapsulation/immobilization are important. In general, the mechanism of drug loading through non-covalent interactions most often results in low loaded drug carriers, and covalent or coordination bonds result in high drug loading efficiency. Such non-covalent bonds are electrostatic interactions, π-π stacking, hydrogen bonding, or hydrophobic/hydrophilic interactions of the drug with the surface of the carrier. For example, the most popular carrier, liposomal, depending on its morphology, is characterized by hydrophobic or hydrophilic drug–carrier interactions. In the case of polymer nanoparticles or dendrimers, they may form structures that allow the drug to become entrapped in a micellar or hollow structure, respectively, or to bind the drug via a chemical linker. Typically, enzymatically or chemically cleavable linkers are used, such as amide, ester, disulfide bonds, or phosphate esters. There are also examples of specific linkers sensitive to the stimulus or enzyme typical of the tumor environment. For example, disulfide bonds can be broken by glutathione, an enzyme that is overexpressed on cancer cells.¹⁰²^,¹⁰³

Due to the type of nanocarriers’ structure, the following types of high drug loading nanomedicines can be distinguished: 1. Inert porous material as a carrier (silica, carbon, or protein nanoparticles); 2. Polymer-drug conjugates (PDCs); 3. Coordination polymer nanoparticles (metal-organic frameworks); 4. Carrier-free nanomedicines (drug nanocrystals, amphiphilic drug–drug conjugates).¹⁰³ The PDCs systems used are solid dispersion of the drug in a hydrophilic polymer, and nanoconjugates of an amphiphilic or hydrophilic polymer with the drug. Recently, various PDCs carrier improvement strategies have been introduced to enhance loading efficiencies, such as the use of: 1. Multi-arm polymer conjugated with drug;¹⁰⁴ 2. The hydrophobic¹⁰⁵ as well as the hydrophilic¹⁰⁶ drugs as part of the core-shell carrier structure; 3. Two drugs with opposite hydrophilicity linked via a hydrophilic carrier (spacer);¹⁰⁷ 4. Encapsulation in core-crosslinked polymer.¹⁰⁸^,¹⁰⁹

Another class of nanomaterials that overcomes the problem of low drug loading is nanocages (protein, gold, carbon, silica, or DNA NCs), which have a hollow structure and can contain up to thousands of drug particles inside.⁹⁷ A different way to increase the effectiveness of drug loading is surface modification. For example, porous iron oxide nanoparticles (IONPs) coated with materials, such as silica, surfactants, carbon, and polymers are used as drug carriers. Moreover, the introduction of functional groups on the surface allows its further modification, for example, with proteins, which further increases the affinity for drugs.¹⁰³ Another example describes calcium phosphosilicate nanoparticles (CPSNPs) as phospho-drug nanocarriers (5-Fluorouracil) where due to metal-ligand complexes between the phosphate group and calcium, efficient drug encapsulation is possible.⁹⁹

It turns out that the effectiveness of the encapsulation procedure depends on many factors, and in the literature, comprehensive analyses can be found regarding specific carriers in combination with various medicines and encapsulation methods. For example, the fact that the route of immobilization should be selected depending on the type of medicine was described by Krukiewicz et al where two different loading methods have been tested with two various active substances. For quercetin, the highest loading was achieved by immobilization on a polypyrrole matrix during the electropolymerization process, while in the case of a second drug tested, ciprofloxacin, incorporation during post-modification (polymer oxidation) was more efficient.¹¹⁰ Furthermore, Perotto et al reported that in addition to such medicine characteristics as hydrophilicity and molecular weight, the charge of the drug might have the most significant impact on its encapsulation, as in the case of positively charged methylene blue-achieving up to 88% encapsulation efficiency in keratin nanoparticles.¹¹¹ Besides, the study of curcumin encapsulation into poly ε-caprolactone NPs was carried out by Nagy and coworkers using Box–Behnken experimental design, where the variables in the encapsulation procedure were the initial amount of the drug, the volume ratio of the organic and aqueous phases, as well as the composition of the organic phase. It was found that the volume of the organic phase containing a drug used for nanoprecipitation of the polymer was crucial for efficient drug loading.¹¹²

In the latest literature, one can also find reports about drugs encapsulated in high loading carriers by environmentally friendly methods. That is, due to aromatic–aromatic interactions and the formation of ionic pairs, hydrophilic and aromatic low molecular weight drugs (HALMD) were encapsulated in a poly(styrene sulfonate) (PSS) with the yield of about 50%.¹¹³

Application, Mechanism of Action, and Drug-Resistance of Selected Chemotherapeutics

Doxorubicin (DOX) is commonly used in various types of malignancies, such as sarcoma, leukemia, lymphomas, breast, lung, and ovarian cancer. There are two different mechanisms of action: intercalation of doxorubicin into DNA and inhibition of topoisomerase II leading to changes in chromatin structure; generation of free radicals and oxidative damage to biomolecules. Repeated doxorubicin administration leads to drug-resistant cancer cells; it also increases drug cytotoxicity. The interaction between signaling pathways can promote drug resistance through the induction of proliferation, cell cycle progression, and prevention of apoptosis. Doxorubicin-induced drug resistance and tumor growth can occur through the adaptive role of the MAPK/ERK pathway in the effort to protect tumor cells. The mechanism of drug resistance of the Anatomical Therapeutic Chemical Classification System (ATC) is related to the expression of multidrug-resistant 1 (MDR1) transporters. MDR1 transporters pump Dox molecules out of cells, reducing intracellular concentration of drug and inhibiting chemotherapeutic efficacy.¹¹⁴^,¹¹⁵

5-Fluorouracil (5-FU) could be applied to treat solid tumors of the gastrointestinal tract, breast, head, and neck, as well as the pancreas. Mechanism of action involves blocking DNA synthesis and replication through inhibition of thymidylate synthase and incorporation of 5-FU metabolites into RNA and DNA. 5‑FU resistance abrogated the anticancer effect amplified by the Chk1 inhibition, even in p53-deficient cancer cells. Chk1 inhibition might be effective in sensitizing 5‑FU resistant cancer cells to 5‑FU because Chk1 activation is reported to be related to the resistance to chemotherapy. It has also been observed that the synergistic cytotoxic potential for Chk1 inhibition during 5‑FU treatment in p53‑deficient colon cancer cells with or without 5‑FU resistance.¹¹⁶^,¹¹⁷

Paclitaxel (PTX) is used against many forms of cancer, for example, ovarian, breast, lung, Kaposi sarcoma, cervical, and pancreatic cancer. Mechanism of action relates to targeting microtubules – it disrupts the major function of microtubules, which is the production of the mitotic spindle during cell division, as well as maintenance of the cell structure, motility, and cytoplasmic movement within the cell. A weakened mitotic checkpoint confers only short-term resistance to mitotic arrest but also the activation of a mitotic checkpoint followed by mitotic slippage resulting in optimal cell killing. There are some identified markers of resistance or sensitivity to paclitaxel, such as proteasome subunits, cyclin-G1 (CCNG1), and solute carrier genes. The cytotoxicity of nanoparticles using tamarind seed polysaccharide and paclitaxel by epichlorohydrin crosslinking (PST-PTX) in cancer cell lines and resistant cancer cell lines were determined by MTT assay. Quantitative analysis of cell death was determined by Annexin V dead cell assay, Caspase 3/7 assay, and expression of pro-apoptotic protein Bax. Overexpression of the ABCB1 gene confers resistance to nab-paclitaxel in urothelial cancer cells.¹¹⁸^,¹¹⁹

Each of these drugs has a different field of application, mechanism of action, and also various explanations of drug-resistance. Cells become resistant to different drugs through various mechanisms of modification of drug targets, alteration in drug metabolism, and genetic changes of cells to target pathways.¹²⁰ However, it is worth noting that despite these differences, resistance to drugs continues to be a principal problem in oncology, affecting most cancer patients.

Improving Activity and Help to Overcome the Drug-Resistance

Currently, major treatments for cancer management include cytotoxic chemotherapy, surgery, targeted therapy, radiation therapy, endocrine therapy, and also immunotherapy. Despite the efforts and achievements made in treating cancers during the last few decades, resistance to classical chemotherapeutic agents and novel targeted drugs remains a major problem in cancer therapies.¹²¹ Drug resistance, also the one existing before treatment (intrinsic) or generated after therapy (acquired), is responsible for most relapses of cancer, which are the major causes of death of the disease. Heterogeneity among patients and tumors and the comprehensiveness of cancer to circumvent therapies make drug resistance even more difficult to deal with. A better understanding of the mechanisms of drug resistance is required to provide guidance to future cancer treatment and achieve better results.¹²¹ The complexity of drug resistance development suggests that combinational and personalized treatment might provide better approaches and improved efficacy for fighting drug resistance in cancer.¹²²

Cancer presents difficult challenges that would benefit from uniting experts from a broad cross-section of related and unrelated fields. Combining extant approaches with novel ones could help in raising this challenging health problem, enabling the development of therapeutics to stop disease progression and prolong patient lives.¹²² Regardless of the research approaches, based on the results from clinical trials and research publications on the application of nanoparticles as drug delivery systems in the treatment of cancer, the main benefits are the enhancement of vascular and gastrointestinal permeability and selectivity of drugs/compounds to tumor cells. Abdifetah et al,¹²³ in their summary of the review, note the fact that due to the application of nanoparticles, the improved permeability and selectivity resulted in the overall improvement of cellular drug uptake, the inhibition of drug hepatic first-pass metabolism and P-gp efflux, the increase in drug solubility and stability, and the decrease in the rate of the drug excretion. As a consequence, a reduced dosage can be achieved without compromising the efficacy, which minimizes potential drug toxicity. Still, regardless of the therapeutic and research progress made, some of the challenges in cancer therapy, such as multidrug resistance (MDR), are being further investigated to better understand the molecular mechanisms and optimize the therapies concerning efficacy and safety. According to El-Readi et al,¹²⁴ due to the tumorous tissue specifics such as their abnormal blood vessels and pathologic processes that hinder effective cancer chemotherapy, the design and application of new methodologies for drug delivery like NPs are vital. MDR is known to be a result of synergistic processes taking place directly in cancer tissues and tumorous cells. In Figure 5, different mechanisms synergistically, causing multidrug resistance (MDR) are summarized.

Multidrug resistance in cancer mechanism overview.¹²⁵

The influence on membrane transport is one of the most important mechanisms in the development of resistance against anticancer drugs. The reduction of drug concentration can be achieved by reduced drug uptake or increased extrusion of the molecules. The overexpression of P-glycoprotein is responsible for efflux. The use of nanoparticles loaded with docetaxel (PLGA-PEG) has proven to be effective in overcoming the MDR as referenced in the article.¹²⁶ The authors also listed other advantages of the application of NPs in the therapy over the standard dosage forms; for example, nanosized drug carriers minimize the elimination of the molecules substantially through the liver or kidney. Other properties like improved permeability and accumulation of nanoparticles loaded with drugs are passively targeting tumor tissues resulting in lower systemic toxicity.

Another successful application of targeted anticancer nanocarriers using biocarriers is presented in the article by Radu et al.¹²⁷ Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) carriers were obtained via the emulsification-diffusion method, loaded with 5-fluorouracil and therapeutic potential on human adenocarcinoma cells was investigated. As a result, it was observed that the drug-loaded carrier could significantly decrease cell viability, showing the high potential of destroying human adenocarcinoma cells. Overall, significant progress has been made in the field of nanocarriers in cancer treatment resulting in improved pharmacokinetic properties, better antitumor efficacy, and lower risk associated with the development of undesirable drug effects. Physicochemical properties of the therapeutic nanocarriers and pathophysiological tumor characteristics still need to be investigated to get deeper insights into the mechanisms allowing effective and safe cancer treatments. Arranja et al reported a list of clinically used nanomedicines containing mainly liposomes, polymer-drug conjugates, and polymeric micelles.¹²⁸ In contrast to traditional chemotherapy, nanomedicines are characterized by prolonged circulation half-lives, increased bioavailability, and better tumor disposition; however, they rely mainly on the EPR effect. To increase our understanding of actively targeted nanodrugs, the authors suggest and discuss the application of strategies from theranostics. The main aim of this approach is to integrate molecular imaging properties into therapeutic agent formulations to monitor tumor accumulation and therapeutic efficacy of nanomedicines at the same application time. More controlled targeted drug delivery should further optimize therapeutic effects minimizing unwanted cytotoxicity in the off-target tissues.

Cancer multidrug resistance (MDR) to chemotherapy is a crucial barrier in the effective treatment of malignancies, which may lead to therapeutic failure of the treatment regimen. Nanotechnology ensures a novel and unconventional approach to circumvent MDR. In Table 6, recent literature examples of application nanocarriers to overcome MDR are presented. Mechanisms and advantages of various types of nanocarriers were discussed below as well as potential approaches to overcome these limitations.

Table 6.

Mechanism of Overcoming Drug Resistance and Benefits of Nanocarrier Use

Drug	Type of Cancer	Type of Nanocarrier	Mechanism of Overcoming Drug Resistance and Benefits of Nanocarrier Use	Ref.
DOX	Ovarian cancer	Iron oxide-titanium dioxide core-shell nanocomposites	Downregulation of TfR1 expression	[120]
DOX	ATC	Dopamine-melanin NPs	Increased cellular uptake	[129]
5-FU	CRC	Mesoporous silica NPs grafted with EGF	Cell death through S phase arrest Downregulation of DPYD expression	[117]
	GC	Gelatinase-stimuli di-block copolymers poly(ethylene glycol)-b-poly(ε-caprolactone) (PEG-b-PCL)	Upregulation of TFAP2E and downregulation DKK4	[130]
	GC	Chitosan NPs	Downregulation of HIF-1α expression	[116]
PTX	Lung cancer	Galactoxyloglucan	Downregulation of the expression of multi-drug resistant proteins P-gp and BCRP	[131]
PTX	MDCK-MDR1	Two diblock copolymers, MePEG114-b-PCL200 and MePEG17-b-PCL5 (PCL200/PCL5) + ultrasound	Increased accumulation of drug	[132]

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Abbreviations: 5-FU, 5-Fluorouracil; ATC, anaplastic thyroid cancer; BCRP, breast cancer resistance protein; CRC, colorectal cancer; DKK4, Dickkopf WNT Signaling Pathway Inhibitor 4; DOX, Doxorubicin; DPYD, Dihydropyrimidine Dehydrogenase; EGF, Epidermal Growth Factor; GC, Gastric Cancer; HIF-1α, Hypoxia-inducible factor 1-alpha; MDCK-MDR1, Madin Darby canine kidney (MDCK) cells with the MDR1 gene; NPs, Nanoparticles; P-gp, Permeability glycoprotein; TFAP2E, Transcription Factor AP-2 Epsilon; TfR1, Transferrin Receptor 1.

Establishing a practical nanotechnology-based drug delivery systems may help in the future to improve the bioavailability and therapeutic efficacy of antitumor drugs while providing better accumulation at the target site compared with conventional antitumor drug delivery systems.

Pharmacoeconomic Aspect of Drug Carriers

The efficacy of selected drugs due to their equivalents in nanocarriers could have an impact on reducing or minimizing costs in pharmacoeconomic analysis, especially in shortening the time of hospitalization or a smaller number of tests carried out. We could also avoid some intangible costs, such as pain, suffering, or anxiety – if the patient stays shorter in the ward and could be faster at home. What is more, we can reduce the number of inpatient days, resulting in decreased risk of infections and medication side effects, improve quality of treatment, and increase hospital profit through more efficient bed management.¹³³

As a result of the use of drug carriers we can observe the following benefits: 1. The economic benefits result from the savings associated with a more cost-effective medical procedure; 2. Clinical benefits are defined as the direct positive effects of the applied therapy, measured by primary or secondary endpoints. The size of clinical benefits is a measure of the clinical effectiveness of the examined medical procedures; 3. Unmeasurable benefits concern the reduction of pain, anxiety, and improvement of life comfort and its duration.

Comparing the use of traditional therapy with alternative therapy, such as nanocarrier-based-therapy, we can evaluate examples of systemic treatment parameters in oncology such as Evaluation of response to treatment (%); Percentage of corresponding patients (%); Percentage of total remissions (%); Time to relapse (months, years); Percentage of reduction in risk of recurrence (%); Percentage of 5-year survival rate (%); Percentage of responses to treatment (%); Percentage of total pathological remissions (%); Total survival time (months); Median survival (months); Indicators of quality of life and reduction of symptoms, such as VAS procedure.¹³⁴

Clinical studies have demonstrated the effects of using PEGylated-liposomal doxorubicin in adjuvant chemotherapy for advanced and metastatic breast cancer (Table 7). Reflected in Table 7, results review the clinical application of PLD in the adjuvant chemotherapy of breast cancer and illustrate the therapeutic effects of pegylated liposomal doxorubicin in various treatment regimens. These clinical studies, which presented therapeutic strategies for applying listed drugs to such adjuvant chemotherapy, show a significant improvement in the treatment results in terms of increased survival time as well as progression-free survival time. Both of these indicators are crucial in the effective treatment of oncological patients.

Table 7.

The Effects of Using Pegylated Liposomal Doxorubicin (PLD) for Adjuvant Chemotherapy of Advanced and Metastatic Breast Cancer

Treatment Regimen	Phase of Clinical Study	Number of Enrolled Patients	Results			Ref.
Treatment Regimen	Phase of Clinical Study	Number of Enrolled Patients	The Total Effective Rate (%)	Median Progression-Free Survival (Months)	Total Median Survival (Months)	Ref.
Evaluation of the effect and safety of salvage chemotherapy for treating metastatic breast cancer with PLD (40 mg/m²)+cyclophosphamide (500 mg/m²) and 5-fluorouracil (500 mg/m²) in the presence of paclitaxel.	II	45	41.9	8.2	Up to 36.6	[135]
Adjuvant chemotherapy in patients with advanced HER-2 positive breast cancer by PLD (administered at 40 mg/m² every four weeks) in combination with lapatinib and trastuzumab.	II	–	4	5.8	23.3	[136]
Comparison of combined PLD (administered at 30 mg/m² every three weeks) and docetaxel with the separate use of docetaxel.	III	–	25–36	7.0–9.8	–	[137]
Examination of the therapeutic efficacy of PLD (administered at 20 mg/m² every two weeks) in elderly patients with advanced breast cancer and all patients enrolled were older than 70 years.	–	–	33.3	10.3	–	[138]
Evaluation of the combined regimen of PLD (administered at 40 mg/m² every four weeks) and navelbine (administered at 25 mg/m² every four weeks) and its therapeutic efficacy in first-line chemotherapy in elderly patients with metastatic breast cancer.	–	34	50	–	3 of 34	[139]

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Over the past decade, the application of nanomaterials for the treatment of cancer features high sensitivity, specificity, and efficacy. Nanomaterials could be applied to employ specific ligands to target cancer cells predictably and deliver encapsulated load capacity effectively. Besides, nanomaterials can also be created for enhanced drug loading, greater half-life in the body, sustained release, and selective distribution by transforming their size, composition, morphology, and surface area. For instance, carbon-based materials, polymeric nanomaterials, metallic nanoparticles, dendrimers, and liposomes have been developed as smart drug delivery systems for cancer treatment, showing improved pharmacokinetic and pharmacodynamic parameters over standard formulations because of their nanosize and individual physicochemical properties.

The data presented in Table 3, suggest that nanotechnology will provide new opportunities for cancer management. Moreover, a range of nanoparticles demonstrate significant efficacy for anticancer therapies, and their application can also be discussed in the pharmacoeconomic context. Considering that all the presented benefits from the use of nanomaterials make nanotechnology much cheaper than conventional treatment, it can also be reflected in the expected pharmacoeconomic efficacy. This could result in the reduction or total avoidance of costs in the management of cancer patients, particularly by reducing costs of interventions, shortening the time of hospitalization or avoided expenditure on illness which results in fewer medical procedures carried out, leads to the reduction of personnel costs and allows patients to return to professional life.

Clinical Application of Drug Carriers

The website clinicaltrials.gov was searched on 09.12.2020. The search was conducted using the keywords: cancer and nanoparticle. The start and end dates of the study were determined from 01.01.2015 to 09.12.2020. The status of the study was also defined – only studies with “completed” status were taken into consideration. As a result of this search, 13 studies meeting the above criteria were found. The search strategy is presented in Table 8.

Table 8.

Terms and Synonyms Searched in Clinical Trials Database

Terms/Synonyms	Search Results*	Entire Database**
Nanoparticle	13 studies	452 studies
Cancer	13 studies	78,405 studies
Neoplasm	13 studies	70,026 studies
Tumor	6 studies	17,331 studies
Malignancy	-	3274 studies
Neoplasia	-	651 studies
Neoplastic Disease	-	22 studies
Neoplastic syndrome	-	618 studies
Oncology	-	1348 studies

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Notes: - No search results. *Number of studies in the results matching the search term or synonym. **Number of studies in the entire database matching the search term or synonym.

To summarize, in Table 9, all studies are interventional (clinical trials), which are presented on the clinicaltrials.gov website. Each study involves a different number of patients, ranging from 2 to 146 participants. Different types of cancer were investigated, and the degree of severity is also taken into account, whether or not it is metastatic cancer. Each study describes arms – experimental or placebo, as well as treatment/other intervention. The selected endpoints – primary, secondary, or other – are included in the studies as per the protocols.

Table 9.

Characteristics of Searched Clinical Studies

I. An Early Phase Study of Abraxane Combined with Phenelzine Sulfate in Patients with Metastatic or Advanced Breast Cancer¹⁶⁸ (8 participants) Metastatic Breast Cancer
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Phase Ib Safety and Pharmacokinetics (PK)/ Pharmacodynamics (PD) Study to Determine the Dosage of Abraxane in Combination with Phenelzine Sulfate in Metastatic or Inoperable Locally Advanced Breast Cancer Study Phase: Phase 1b Study Objectives: To determine the safety and efficacy after administration of Abraxane and phenelzine sulfate (Nardil) for metastatic or locally advanced breast cancer. Study design: Interventional, open label, non-randomised, cumulative cohort group design (5 groups) with a defined target toxicity fraction of 30% and a corresponding margin of 10%. The toxicity fraction is defined for clinical application and study as the number of study subjects receiving particular dose who experience a Dose-Limiting Toxicity. Study Status: completed (October 30, 2019)	Arms: 1. Nanoparticle albumin-bound paclitaxel. Abraxane i.v. (100mg/m²) 2. Phenelzine Sulfate (Nardil) p.o. initial dose of 15mg/d to a max dose of 90mg/d	Brief Summary Participants diagnosed with metastatic breast cancer or inoperable locally advanced breast cancer of age 18 years or above will receive combination of intravenously administered Abraxane and phenelzine sulfate orally. Both of the medicinal products have been applied in clinical practice for years however the combination of both has not been given for cancer therapy. The aim of the study is to investigate the effect of those two drugs together. Safety and efficacy will be assessed weekly for the period of 3 administration cycles. Abraxane administration is given weekly for the first 3 weeks of a 4-week period for 3 consecutive cycles. Phenelzine sulfate will be given daily for 3 cycles. Study is divided in five cohort groups each will be given a progressively increasing dose of phenelzine sulfate. Primary Outcome Measures Dose-Limiting Toxicity events assessed during the initial fifty-six (56) days Secondary Outcome Measures 1. Abraxane Cmax 2. Abraxane Tmax 3. Abraxane Half-life 4. Abraxane AUC 5. Nardil Cmax 6. Nardil Tmax 7. Nardil Half-life 8. Nardil AUC 9. Circulating Tumour Cell burden: a. PDL1 expressing Circulating Tumour Cell b. HER2 expressing Circulating Tumour Cell c. FFPE Tumour cells d. FFPE Stoma cells e. FFPE Cancer Stem Cells
II. Nanoparticle Albumin-Bound Rapamycin in Treating Patients With Advanced Cancer With mTOR Mutations¹⁶⁹ (2 participants) Advanced Malignant Neoplasm; Cervical Squamous Cell Carcinoma; Endometrial Carcinoma; Malignant Uterine Neoplasm; Recurrent Carcinoma of Bladder, Breast, Cervical, Head, and Neck, Ovarian, Prostate; Recurrent Malignant Neoplasm; Recurrent Renal Cell Carcinoma; Solid Neoplasm Stage III; Bladder Cancer Stage: III, IVA, IVB; Prostate Cancer Stage III & Stage IV; Renal Cell Cancer Stage IIIA & Stage IVA; Breast Cancer Stage: IIIA, IIIB, IIIC, IV; Cervical Cancer Stage: IIIA, IIIB, IVB; Ovarian Cancer Stage: IIIB, IIIC, IV
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Pilot Study of a Rapid Access Platform for Investigational Drugs (RAPID) in Advanced Cancers Study Phase: Phase 1 Study Objectives: PRIMARY OBJECTIVES: I. To investigate efficacy. II. To determine the confirmed response rate of nab-rapamycin SECONDARY OBJECTIVES: I. To estimate other clinical outcomes II. To assess the adverse event profile III. To assess the clinical benefit IV. To assess progression-free survival and overall survival of these patients. TERTIARY OBJECTIVES: I. To assess quality of life and to correlate HRQOL/symptoms with genomic markers. II. To assess the rate of individual mTOR pathway aberrations Study design: Interventional, Open label, Single group assignment Study dates: Study start date: January 2016; Study end date: April 24, 2018 Study Status: completed	Arms: 1. Nanoparticle albumin-bound rapamycin Interventions 1. Laboratory Biomarker Analysis 2. Quality-of-Life Assessment	Brief Summary This pilot study investigates clinical response to rapamycin administered to patients with advanced cancer and having abnormal genetic test results in a protein called mechanistic target of rapamycin (mTOR). Patients are given nanoparticle albumin-bound rapamycin, which may inhibit the growth of cancer cells by influencing the mTOR enzyme, required for cell growth. Primary Outcome Measures 1. Proportion of confirmed responses (clinical benefit) Secondary Outcome Measures 1. Incidence of adverse events 2. Relationship of adverse events to study treatment 3. Survival time 4. Time to disease progression Other Outcome Measures 1.Quality of life (EORTC QLQ-C30 questionnaire) 2. Rate of mTOR pathway aberrations
III. A Study of CriPec^® Docetaxel Given to Patients With Solid Tumours¹⁷⁰ (33 participants) Metastatic Cancer, Solid Tumors
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Phase I Open-Label, Safety, Pharmacokinetic and Preliminary Efficacy Study of CriPec^® Docetaxel in Patients With Solid Tumours Study Phase: Phase 1 Study Objectives: To assess safety and tolerability Study design: Open Label, Single Group Assignment Study dates: Study start date: August 2015 Study end date: July 2018 Study Status: completed	Arms: 1. CriPec^® docetaxel Docetaxel containing nanoparticle 3 weekly IV dose	Brief Summary The aim of this study is to determine safety by finding the highest safe dose of CriPec^® docetaxel that can be administered to patients with solid tumours Primary Outcome Measures 1. Incidence of adverse events (grade 3 or 4) as a measure of safety and tolerability. 2. Incidence of abnormal clinical laboratory values as a measure of safety and tolerability. 3. Incidence abnormal of electrocardiogram findings as a measure of safety and tolerability. 4. Incidence of adverse events at the Maximum Tolerated Dose (grade 3 or 4) 5. Incidence of abnormal lab values at the Maximum Tolerated Dose 6. Incidence of ECG abnormalities at the Maximum Tolerated Dose 7. Pharmacokinetics: (Tmax), (Cmax), volume of distribution (Vd), half life (t1/2), total body clearance (CL) and area under the concentration-time curve (AUC) Secondary Outcome Measures 1. Early signs of anti-tumor efficacy (overall response rate) 2. Early signs of anti-tumor efficacy (duration of response)
IV. PIPAC Nab-pac for Stomach, Pancreas, Breast and Ovarian Cancer¹⁷¹ (20 participants) Ovarian Cancer Stage: IIIB, IIIC, IV; Breast Cancer Stage: IIIB, IIIc, IV; Stomach Cancer; Stage III & Stage IV with Metastases; Pancreas Cancer, Stage III& Stage IV
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Intraperitoneal Aerosolization of Albumin-stabilized Paclitaxel Nanoparticles for Stomach, Pancreas, Breast and Ovarian Cancer Study Phase: Phase 1 Study Objectives: To assess maximal tolerated dose via dose escalation combined with pharmacokinetic/pharmacodynamic modelling which incorporates, in addition to plasma, tumor tissue, and peritoneal drug concentrations, biomarkers of toxicity and efficacy Study design: Interventional, Randomized, Single Group Assignment, Double blinded, Multicenter Study dates: Study start date: September 16, 2017; Study end date: May 6, 2020 Study Status: completed	Arms: 1. PIPAC with Abraxane (35 mg/m²) 2. PIPAC with Abraxane (70 mg/m²) 3. PIPAC with Abraxane (90 mg/m²) 4. PIPAC with Abraxane (112,5 mg/m²) 5. PIPAC with Abraxane (140 mg/m²)	Brief Summary The study is designed to assess the maximal tolerated dose of albumin bound nanoparticle paclitaxel (nab-pac) administered with repeated pressurized intraperitoneal aerosol chemotherapy Primary Outcome Measures 1. Maximally tolerated dose of Abraxane (dose limiting toxicities) Secondary Outcome Measures 1. Surgical morbidity will be measured (Dindo-Clavien classification) 2. Maximum plasma concentration of Abraxane 3. Area Under the Curve (AUC) 4. Pharmacodynamics of Abraxane will be analyzed using tumor markers (CA15.3 for breast cancer, CEA for stomach cancer, CA19.9 for pancreatic cancer, CA125 in case of ovarian cancer). 5. Pharmacodynamics (PD) of Abraxane will be analyzed by tumor biopsies 6. Quality of Life (EORTC QLQ-C30 questionnaire) 7. Quality of Life (FACT-G questionnaire) 8. Neutropenia (neutrophil count) 9. Decreased platelet count
V. Ceritinib and Combination Chemotherapy in Treating Patients With Advanced Solid Tumors or Locally Advanced or Metastatic Pancreatic Cancer¹⁷² (38 participants) Advanced Malignant Solid Neoplasm; ALK Positive Metastatic Pancreatic Adenocarcinoma Pancreatic Cancer Stage III & Stage IV
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Phase I Study of Ceritinib (LDK378), a Novel ALK Inhibitor, in Combination With Gemcitabine-Based Chemotherapy in Patients With Advanced Solid Tumors Study Phase: Phase 1 Study Objectives: PRIMARY OBJECTIVES: I. Determine the maximum tolerated dose and recommended Phase II dose of ceritinib in combination with gemcitabine (gemcitabine hydrochloride) alone, gemcitabine/nab-paclitaxel and gemcitabine/cisplatin in patients with advanced solid malignancies. SECONDARY OBJECTIVES: I. Assess the safety profile II. Determine the pharmacokinetic characteristics III. Determine the preliminary efficacy of the study drug combinations. TERTIARY OBJECTIVES: I. Investigate potential biomarkers of efficacy Study design: Interventional, Non-randomized, Open label, Parallel assignment Study dates: Study start date: January 8, 2015; Study end date: February 12, 2019 Study Status: completed	Arms: 1. Ceritinib maximum tolerated dose (MTD) then gemcitabine alone Interventions 1: Drug: Ceritinib Drug: Gemcitabine Hydrochloride Other: Laboratory Biomarker Analysis Other: Pharmacological Study 2. Ceritinib maximum tolerated dose then with gemcitabine and paclitaxel albumin-stabilized nanoparticle Interventions 2: Drug: Ceritinib Drug: Gemcitabine Hydrochloride Drug: Paclitaxel Albumin-Stabilized Nanoparticle Formulation Other: Laboratory Biomarker Analysis Other: Pharmacological Study 3. Ceritinib maximum tolerated dose then with gemcitabine and cisplatin Interventions 3: Drug: Ceritinib Drug: Cisplatin Drug: Gemcitabine Hydrochloride Other: Laboratory Biomarker Analysis Other: Pharmacological Study	Brief Summary Study to determine safety - the maximum tolerated dose and recommended Phase II dose for chemotherapy with Ceritinib (LDK378) in patients with advanced solid tumors Primary Outcome Measures 1. Maximum tolerated dose and recommended Phase II dose of ceritinib in combination with gemcitabine hydrochloride alone 2. Maximum tolerated dose and recommended Phase II dose of ceritinib in combination with gemcitabine hydrochloride and cisplatin 3. Maximum tolerated dose and recommended Phase II dose of ceritinib in combination with gemcitabine hydrochloride and paclitaxel albumin-stabilized nanoparticle formulation Secondary Outcome Measures 1. Incidence of adverse events of Ceritinib in combination treatment with gemcitabine hydrochloride chemotherapy Safety profile based on event type, frequency, severity, time relationship, seriousness and relationship to study treatment. 2. Pharmacokinetics of Ceritinib and Gemcitabine hydrochloride combined: A population based pharmacokinetic model to estimate individual AUC or clearance of Ceritinib 3. Pharmacokinetics of Ceritinib, Gemcitabine hydrochloride, and paclitaxel albumin-stabilized nanoparticle formulation; A population based pharmacokinetic model will be developed to estimate individual AUCs or CL of Ceritinib in combination with Gemcitabine hydrochloride and nab-Paclitaxel. 4. Pharmacokinetic characteristics of paclitaxel albumin-stabilized nanoparticle formulation, and cisplatin; A population based pharmacokinetic model will be developed to estimate individual AUCs or CL of Ceritinib in combination with Gemcitabine hydrochloride and Cisplatin. 5. Progression free survival 6. Response rate as estimated by the RECIST 1.1 Other Outcome Measures: 1. Tumor biomarkers and levels of serum
VI. Phase 1 Trial of PAN-301-1 (SNS-301) in Cancer Patients¹⁷³ (12 participants) Prostate Cancer
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Phase 1, Open Label Trial to Evaluate the Safety and Immunogenicity of PAN-301-1 in Cancer Patients Study Phase: Phase 1 Study Objectives: Study design: Interventional, Sequential Assignment, Open label Study dates: Study start date: December 2016; Study end date: December 2018 Study Status: completed	Arms: 1. PAN-301-1 (SNS-301) Vaccine Intervention: Biological: PAN-301-1	Brief Summary Research phase 1 study of PAN-301-1 (SNS-301), a HAAH directed nanoparticle vaccine, given intradermally in cohorts of patients with biochemically relapsed prostate cancer, aiming to assess safety parameters. Primary Outcome Measures Safety assessment to determine maximum tolerated dose by monitoring the development of adverse events and dose-limiting toxicity Secondary Outcome Measures Safety assessment by monitoring administration site reactions, abnormal lab values and adverse events
VII. Gemcitabine Hydrochloride, Cisplatin, and Nab-Paclitaxel in Treating Patients With Advanced or Metastatic Biliary Cancer¹⁷⁴ (62 participants) Stage III Intrahepatic Cholangiocarcinoma AJCC v7 Stage IIIA Gallbladder Cancer AJCC v7 Stage IIIB Gallbladder Cancer AJCC v7 Stage IVA Gallbladder Cancer AJCC v7 Stage IVA Intrahepatic Cholangiocarcinoma AJCC v7 Stage IVB Gallbladder Cancer AJCC v7 Stage IVB Intrahepatic Cholangiocarcinoma AJCC v7 Unresectable Extrahepatic Bile Duct Carcinoma Unresectable Gallbladder Carcinoma
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Phase II Study of Gemcitabine, Cisplatin, and Abraxane in Advanced Biliary Cancers Study Phase: Phase 2 Study Objectives: PRIMARY OBJECTIVES: I. Determine the progression-free survival of gemcitabine hydrochloride (gemcitabine), cisplatin, and nab-paclitaxel in advanced, untreated biliary cancers. SECONDARY OBJECTIVES: I. Determine the response rate and disease control rate II. Determine overall survival of gemcitabine, cisplatin, and nab-paclitaxel in advanced biliary cancers. III. Evaluate the toxicity of gemcitabine, cisplatin, and nab-paclitaxel in advanced biliary cancers. Study design: Interventional, Single Group Assignment, Open - label Study dates: Study start date: April 2, 2015; Study end date: August 13, 2020 Study Status: completed	Arms: 1. Treatment (nab-paclitaxel, cisplatin, gemcitabine) Intervention/treatment Drug: Cisplatin Given IV Drug: Gemcitabine Hydrochloride i.v. Drug: Nab-paclitaxel i.v. Other: Laboratory Biomarker Analysis, Correlative studies	Brief Summary This study investigates the efficacy of the intervention drugs administered in patients with biliary cancers. Primary Outcome Measures Progression free survival Secondary Outcome Measures Incidence of adverse events
VIII. Radiosensitization of Multiple Brain Metastases Using AGuIX Gadolinium Based Nanoparticles¹⁷⁵ (15 participants) Brain Metastases
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Phase I Clinical Study of Radiosensitization of Brain Metastases By Gadolinium Nanoparticles Study Phase: Phase 1 Study Objectives: To study safety and preliminary efficacy Study design: Interventional, open label, Single Group Assignment Study dates: Study start date: March 2016; Study end date: February 2019 Study Status: completed	Arms: 1. AGuIX and radiotherapy With the following escalation cohorts: 15 mg/kg, 30 mg/kg, 50 mg/kg, 75 mg/kg and 100 mg/kg Intervention/treatment Drug: AGuIX	Brief Summary Study investigates if AGuIX particles may increase the effectiveness of radiation therapy by sensitizing tumor cells to radiation. This trial studies the side effects and optimal dose of AGuIX when injected together with whole brain radiation therapy. The preliminary effectiveness of the combination of AGuIX and radiation therapy will be also assessed. Primary Outcome Measures 1. Maximum tolerated dose of AGuIX given with the whole brain radiation therapy Secondary Outcome Measures 1. Pharmacokinetic parameter of AGuIX particles - Cmax 2. Pharmacokinetic parameter of AGuIX particles - AUC 3. Pharmacokinetic parameter of AGuIX particles -T1/2 4. MRI to evaluate distribution of AGuIX particles in brain metastases and surrounding healthy tissue 5. MRI to assess intracranial progression-free survival 6. Overall survival
IX. Study to Evaluate CORT125134 in Combination With Nab-paclitaxel in Patients With Solid Tumors¹⁷⁶ (146 participants) Solid Tumors
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Phase 1/2 Study of CORT125134 in Combination With Nab-paclitaxel in Patients With Solid Tumors Study Phase: Phase 1/2 Study Objectives: To assess the safety and to determine the preliminary efficacy Study design: Interventional, non-randomized, open label, Single Group Assignment, multicenter Study dates: Study start date: May 2016; Study end date: May 2020 Study Status: completed	Arm CORT125134 with nab-paclitaxel Intervention/treatment CORT125134 with nab-paclitaxel p.o. Nab-paclitaxel i.v.	Brief Summary The purpose of this study is to assess the safety and preliminary efficacy of the combination of drugs: CORT125134 and nab-paclitaxel administered in patients with solid tumors. Primary Outcome Measures 1. Maximum Tolerated Dose of CORT125134 Secondary Outcome Measures 1. Incidence of Treatment-Related Adverse Events Other Outcome Measures 1. Objective response rate, progression free survival, overall survival 2. Objective response rate, progression free survival, and overall survival in patients with GR-positive or GR negative solid tumors. 3. Pharmacokinetics: exposure-response 4. Pharmacodynamics: modulation of GR function, hormonal changes and FKBP5
X. Study of Topical SOR007 Ointment for Cutaneous Metastases¹⁷⁷ (23 participants) Cutaneous Metastasis
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Phase 1/2 Dose-Rising, Safety, Tolerability and Efficacy Study of Topical SOR007 for Cutaneous Metastases Study Phase: Phase 1/2 Study Objectives: To evaluate the safety, tolerability and preliminary efficacy of SOR007 (in different concentrations) Study design: Interventional, Non-Randomized, Sequential Assignment, open-label, dose-rising Study dates: Study start date: January 31, 2018; Study end date: April 29, 2020 Study Status: completed	Arms: 1. SOR007 0.15% (Uncoated Nanoparticle Paclitaxel) Ointment 2. SOR007 1.0% (Uncoated Nanoparticle Paclitaxel) Ointment 3. SOR007 2.0% (Uncoated Nanoparticle Paclitaxel) Ointment Intervention Drug: Uncoated Nanoparticle Paclitaxel) Ointment	Brief Summary To study a topical nanoparticle paclitaxel ointment (SOR007) for the treatment of cutaneous metastases from non-melanoma cancer in adults. Primary Outcome Measures 1. Incidence of treatment emergent adverse events Secondary Outcome Measures 1. Difference in total area of eligible lesion(s) in the treatment area 2. Objective clinical response 3. Reduction in pain at the treatment area 4. Pharmacokinetic parameter – AUC 5. Pharmacokinetic parameter – Cmax 6. Pharmacokinetic parameter – Tmax
XI. PET Study With [89Zr]-Df-CriPec^® Docetaxel¹⁷⁸ (7 participants) Solid Tumor
Selected Study Details	Arms and Interventions	Brief Description and Outcome Measures
Official Study Title: A Clinical Phase I, Open-label, PET Study With [89Zr]-Df-CriPec^® Docetaxel in Patients With Solid Tumours to Assess Biodistribution and Tumour Accumulation of [89Zr]-Df-CriPec^® Docetaxel Study Phase: Phase 1 Study Objectives: To assess biodistribution and tumour accumulation of the drug administered. Study design: Open Label, Single Group Assignment Study dates: Study start date: April 1, 2018; Study end date: May 8, 2020 Study Status: completed	Arms: 1. [89Zr]-Df-CriPec^® docetaxel	Study with administration of [89Zr]-Df-CriPec^® docetaxel in patients with solid tumours to assess biodistribution and tumour accumulation of the drug given. Primary Outcome Measures Detection (visual) of [89Zr]-Df-CriPec^® docetaxel in tumour lesions Visual detection (absent/present) of tumor uptake Detection (quantitative) of [89Zr]-Df-CriPec^® docetaxel in tumour lesions Secondary Outcome Measures Dosimetry of [89Zr]-Df-CriPec docetaxel based on activity concentration and biodistribution Optimal time point for PET imaging after [89Zr]-Df-CriPec^® docetaxel administration Linearity between [89Zr]-Df-CriPec^® docetaxel and total docetaxel Biodistribution of low dose dose [89Zr]-Df-CriPec^® docetaxel before and after administration of therapeutic dose of CriPec^® docetaxel.
XII. A Sunscreen Based on Bioadhesive Nanoparticles¹⁷⁹ (13 participants) Melanoma; UV Ray Skin Damage
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: Assessing the Safety and Efficacy of Multifunctional Skin-adhesive Nanoparticles for UV Protection in Humans Study Phase: Phase 1 Study Objectives: To evaluate the duration of protection and efficacy of a bioadhesive nanoparticle sunscreen Study design: Randomized, double blinded, parallel assignment Study dates: Study start date: July 17, 2017 Study end date: August 18, 2017 Study Status: completed	Arms: 1. UV filtering agent and bioadhesive nanoparticles (BNPs) 2. Standard Sunscreen consisting of padimate O (7%) and oxybenzone (3%). 3. Sham Comparator: A placebo strips with no UV filtering 4. Control, no agent applied.	Brief Summary: Study assesses the safety, sun protection factor (SPF) characteristics, and the duration of protection. Primary Outcome Measures Skin Reaction assessed by examination (evidence of irritation, inflammation, follicular occlusion).
XIII. NU-0129 in Treating Patients With Recurrent Glioblastoma or Gliosarcoma Undergoing Surgery¹⁸⁰ (8 participants) Gliosarcoma; Recurrent Glioblastoma
Selected Study Details	Arms and Interventions	Brief description and Outcome Measures
Official Study Title: A Phase 0 First-In-Human Study Using NU-0129: A Spherical Nucleic Acid (SNA) Gold Nanoparticle Targeting BCL2L12 in Recurrent Glioblastoma Multiforme or Gliosarcoma Patients Study Phase: Phase 0 Study Objectives: PRIMARY OBJECTIVES: I. To assess the safety of i.v. administration of NU-0129 SECONDARY OBJECTIVES: I. To assess serum drug concentration II. To verify intratumoral penetration of NU-0129. III. To verify the feasibility of administering NU-0129 as a standard treatment for recurrent glioblastoma multiforme or gliosarcoma. TERTIARY OBJECTIVES: I. To analyze Bcl2L12 expression levels II. Progression free survival and overall survival at 6 months; overall response rate. Study design: Interventional, Open Label, Single Group Assignment Study dates: Study start date: May 25, 2017; Study end date: August 19, 2020 Study Status: completed	Arms: 1. Experimental treatment (NU-0129) Intervention: 1. Laboratory Biomarker Analysis 2. Pharmacological Study	Brief Summary: The aim of this study is to evaluate the safety of the administered drug, NU-0129, (via application of nucleic acids arranged on the surface of a small spherical gold nanoparticle) in patients with recurrent glioblastoma multiforme or gliosarcoma. The researchers expect that targeting the Bcl2L12 gene with NU-0129 will stop cancer cells from growing. Primary Outcome Measures Incidence of Adverse Events Secondary Outcome Measures 1. Drug concentration in blood 2. Biodistribution of NU-0129 in tumor tissue (concentration of particles in various parts of the tumors). 3. Feasibility of administering NU-0129 as a standard treatment

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Unfortunately, so far, no results have been published for any of the thirteen studies, so we cannot draw any conclusions, but we can state that the use of nanoparticles in medicine, in the treatment of cancer, is becoming increasingly popular.

Business Criteria for the Development of Drug Carriers

During the manufacturing of drug forms, different methods should be considered. The selection of manufacturing methods often depends on the final product’s requirements in terms of clinical efficacy, including size distribution, chemical composition, and drug release characteristics together, which dictates the pharmacokinetic demonstration of adsorption, distribution, metabolism, and elimination (ADME).¹⁸¹

Reducing Cost/Reagents/Green Synthesis

It is estimated that the development of a new nanodrugs takes only about 3–4 years and $20- $50 million. In comparison, discovering new active molecules takes more than 10 years, costing an average of about $500 millions.¹⁸²

In order to perform the procedure for obtaining a drug delivery system designed in a laboratory on an industrial scale, careful optimization of the synthesis must be carried out in order to reduce the production costs. For example, Ding et al carried out a tedious optimization of polymer synthesis for protein therapy by changing time, solvent, and equivalents of reagents. As a result, the cost of a polymer prepared on a few hundred grams scale, following the principles of green chemistry, was reduced by almost 90%.¹⁸³

Furthermore, in industrial-scale production, the time of synthesis directly translates into cost; thus, it is important to choose the most time-efficient¹⁸⁴ and inexpensive production method.¹⁸⁵ Finally, affordable, non-toxic, and common solvents, such as water, are most desirable.¹¹¹ Interestingly, to reduce the time and cost of formulation development, computational methods are used to predict in vitro/in vivo properties of carriers, such as stability, solubility, and potential toxicity.¹⁸⁶

It is also worth noting that multifunctional carriers with targeting and imaging properties as well as multistep synthesis and greater regulatory hurdles thereof are worth the cost due to their numerous advantages, such as reducing side effects, dosing frequency, use in theranostics, and even reducing the toxicity of the drug, as proved by Cheng et al.¹⁸⁷ Despite higher production costs, recent analyses show that the use of targeted drug delivery systems for cancer patients leads to long-term reduced healthcare utilization and expense.¹⁸⁸

Transfer of Drug Carriers Synthesis Methods from Lab to Industry - Challenges

Despite increased interest in nanodrugs in recent years, the transfer of methods to the market is still a challenge due to the difficult industrial transfer.¹⁸⁹^,¹⁹⁰ In general, procedures of nanocarriers synthesis are sensitive to reaction conditions and the characteristics of nanomaterials (size, charge, shape, morphology, and dispersity) can be easily disturbed due to scaling-up and thus formulation and effectiveness of nanodrugs may change.¹⁹¹ Furthermore, these parameters are very important for the in vivo stability and toxicity of nanocarriers.¹⁹²

In an industrial plant, the particle size can be affected by the available chemical reactor volume, stirring velocity, and time, as well as the energy used during the synthesis. These fluctuations in features may further lead to decreased efficiency of drug loading.¹⁹³^,¹⁹⁴ One of the examples of difficulties associated with large-scale production can be Doxil, the first nanodrug authorized in 1995, whose sales were suspended in 2011–2014 due to production and sterility problems.¹⁹⁵ Furthermore, it was described in the literature how scaling-up generated new minor impurity, which was found to be cytotoxic and changed the colloidal and structural properties of nanoparticles.¹⁹⁶

Another challenge regarding the industrial transfer of nanodrugs is an insufficient number of guidelines for the characterization of nanoparticles concerning their safety and non-toxicity and lack of strict legal regulations.¹⁸⁸^,¹⁹⁷ Given the listed challenges, to obtain the desired features during the synthesis of drug formulations, the Food and Drug Administration (FDA) introduced in the 2000s a method of quality by design, which provides product quality controls at every stage of the process (by using pH or ionic strength sensors). In this way, the key parameters of the drug carrier synthesis must be obtained via standardized procedures and scalable chemical equipment. Since the synthesis conditions in the industrial plant are different from in the laboratory, each stage of the synthesis must be transferred according to Chemistry, Manufacturing and Controls (CMCs) and follow good manufacturing practice (GMP) requirements.¹⁹¹^,¹⁹⁸ However, as it is not easy to control the process taking into account so many parameters that nanoparticles desire, a reproducibility problem arises.¹⁹⁵ As a consequence, each batch of produced material must be thoroughly tested to ensure its characteristics, safety, and non-toxicity.¹⁹⁰ Some researchers suggest that routine testing of large-scale formulations in animal models would be desirable.¹⁹¹

One may notice a deficit of simple industrial procedures for the synthesis of nanomaterials regarding the limited possibilities of the industrial plant.¹⁹⁹ Methods for the synthesis of nanomaterials described in the literature have many limitations, such as the difficult removal of a toxic organic solvent (in solvent emulsification-diffusion technique applied to lipids) or challenging maintaining sterility of the product.¹⁸⁵^,¹⁹¹^,²⁰⁰ Furthermore, some methods to produce nanoformulations, such as freeze-drying and spray-drying used to fabricate nanoencapsulates in powder form, are expensive and may affect particle size.²⁰¹ Large-scale preparation of nanocarriers that will be biodegradable in vivo is another challenge.²⁰¹^,²⁰² Therefore, top-down processes (consisting of mechanical fragmentation of the product) are still more common than the bottom-up approach (generating nanoparticles starting from molecules or atoms).²⁰³ However, some production methods seem to be more useful than others for large-scale applications, such as supercritical reverse-phase evaporation or microfluidic mixers.¹⁹¹^,¹⁹²

Furthermore, as usually creating a new drug delivery system is a reformulation of a previously known drug, pharmaceutical companies often do not consider this process worth the time and costs compared to profits and prefer investing in the search for new drugs by simply screening libraries of small compounds.¹⁸⁸^,¹⁹⁹

Green Synthesis in Drug Carriers Manufacturing

“Green nanomedicine” is a new field of drug delivery systems based on nanomaterials, which provides tools for more economical nanocarriers synthesis. However, currently, only a few literature examples of research can be found in which at least a few of the dozen “green chemistry” postulates have been met. Among syntheses of such drug carriers as nanometallic compounds, polymer nanocomposites, and quantum dots one can find examples of the use of safer reagents, solvents or auxiliaries, the design of safer, atom economical syntheses, application of renewable energy sources, or the synthesis of biodegradable carriers. Among the described nanosystems, protein and lipid compounds are the safest of known drug carriers.²⁰⁴^,²⁰⁵

A very important aspect is the choice of the synthesis method among those available.²⁰⁶ A separate group of non-toxic reactions in nanomedicine are methods that use plant extracts as reagents. For example, Palai et al described the synthesis of a decorated graphene nanocomposite, where the aqueous neem leaf extract was used to reduce graphene oxide, while the synthetic procedure was modified to reduce the number of toxic gases and impurities generated.²⁰⁷

One of the latest examples of the use of eco-friendly reagents was delivered by Uthappa et al, who described the green synthesis of natural diatoms modified with polydopamine as a drug delivery system, in which additionally the synthesis time was reduced and no toxic reagents and solvents were used.⁸⁷ Furthermore, Hasan et al described the eco-friendly synthesis of silver nanoparticles in which the reduction process by chemical compounds has been replaced by a reduction by a biopolymer (dextrin).²⁰⁸ An alternative to green solvents may be the use of ionic liquids.²⁰⁹

Despite the existence of more adaptive techniques, such as reverse-phase evaporation or thin-film hydration, a green technique, energy-saving probe sonification method using only water as a solvent, was chosen for the production of niosomes by Khan et al.¹¹³ Next, Ca²⁺ cross-linked Fe-guanosine monophosphate (Fe-GMP) hydrogel for doxorubicin delivery was prepared by facile mixing of appropriate components at ambient conditions.²¹⁰ Finally, it is important to select those biocompatible from among the available polymers (poly(sodium 4-styrene sulfonate), PSS), and assure that the encapsulation of the drug takes place using a simple green method, for example, by mixing of two aqueous phases containing the polymer and the drug, respectively.⁹² From the producer’s point of view, the more “green” the process, the cheaper and safer for the final product due to the lack of toxic impurities.

Pharmacokinetic and Toxicological Studies of Nanoparticles as a Delivery System

Pharmacokinetics, often described as what an organism does to a drug, is a branch of pharmacology dealing with the study of the activity of compounds in the body over a period of time with a primary focus on processes by which medicinal products and drugs are absorbed, distributed, metabolized, and finally excreted (ADME). Pharmacokinetics depends on many factors that are related to the physicochemical properties of the complex substance as well as to patient-related conditions like gender, age, individual physiology, or genetics. Knowledge of pharmacokinetics is crucial for targeted and safe application of drugs to achieve the maximum therapeutic effect and the minimum risk associated with the occurrence of adverse effects.

An ideal drug should be highly specific concerning the pathologic processes and changes without any toxicity to healthy organs, tissues, or cells. The most desired properties of an active compound should directly lead to proper absorption and drug distribution, low metabolism, decent elimination, and low toxicity.

Pharmacokinetic key parameters used for defining and describing the ADME processes include bioavailability (by determining the area under the plasma concentration–time curve), elimination half-life (t_1/2), the volume of distribution (Vd), and clearance (CL).¹²³ These factors play a crucial role in the determination of the concentration of the drug in the body at a specific therapeutic target. Pharmacokinetics is applied to estimate the exposure and the most important parameters used to define the optimal dosage form and the dosing regimen in clinical practice to achieve maximum efficacy and lowest toxicity.²¹¹

Pharmacokinetic Aspect of the Application of Nanoparticles as Delivery Systems

Drugs encounter many barriers in living organisms from the time of administration in a specific dosage form until the therapeutic molecules reach the target. Advances in technology allow us to make structural changes that make significant improvements in drug properties and help overcome the limitations of reduced drug efficacy and potential safety issues. Advances in nanotechnology over the past decades did revolutionize drug delivery systems by improving their pharmacokinetic and pharmacodynamic properties, such as higher solubility, duration of exposure, and targeted delivery to the site of action.²¹²

The tabulation below briefly summarizes the main differences in pharmacokinetic properties of small drug molecules and the desirable drug-loaded nanoparticles (Table 10).

Table 10.

Pharmacokinetic Properties Comparison Between Small Molecule Drugs and Drug-Loaded Nanoparticles

PK Property	Small Molecule Medicine	Drug-Loaded Nanoparticle
Volume of distribution	High	Low
Bioavailability (AUC)	Low	High
Circulation half time	Short	Long
Tumor accumulation	Poor	Good
Clearance	Rapid	Slow

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There are many different types of nanoparticles used as carriers for therapeutic compounds, as shown in Figure 6., each of them having different properties.

Classification of nanocarriers for drug delivery.

As mentioned in previous sections, nanoparticles differ in their surface charge, particle size and shape, efficiency, loading capacity, and stability, leading to substantial variability in pharmacologic effects and the safety of different nanocarriers. Petschauer et al summarize in their review the main factors affecting the pharmacokinetic (PK) and pharmacodynamic (PD) properties of anticancer carrier-mediated agents in patients.²¹³ The discussion includes the following elements: Uptake by the mononuclear phagocyte system; Delivery of the compounds in tumors: nanoparticles (NPs) can get into tumors’ tissue due to the leaky vasculature, which results in enhanced permeability and retention effect.; Particle size and shape: NPs between 100 and 200 nm have been observed to be most efficient in uptake by tumors; in turn, particles smaller than 50 nm showed short circulation time, and NPs greater than 300 nm prevented particles from taking advantage of the EPR effect, leading to lower tumor accumulation; Surface modification and charge (Conjugation of PEG to the surface of NPs increases circulation time and bioavailability – measured by Area Under The Curve – AUC; Uncharged particles have less mononuclear phagocyte system uptake, which results in longer circulation time); The concentration of NPs administered: a higher concentration level of particles per dose given increases the drug exposure in both plasma and tumor.

Besides, the authors stress the fact of the existence of a relationship between NP clearance and patient age, gender, disease conditions like liver or renal impairments, or concomitant medications. Another point to consider is the possibility to predict pharmacokinetic properties of PEGylated liposomal NPs based on the monocyte and dendritic cells function.

Advances in computational sciences over the past decade allow researchers to focus on mathematical and statistical approaches. Dogra et al describe a novel modeling approach aiming to predict whole-body nanoparticle pharmacokinetics and their tumor delivery.²¹⁴ The identified main factors governing NP kinetics in the tumor interstitium were nanoparticle size, tumor vascular fraction, tumor vascular porosity, nanoparticle degradation rate, and tumor blood viscosity. Since the number of potential factors having an influence on the ADME processes in the living organism is huge by nature, mathematical modeling in this parameter space is proposed as an efficient alternative to traditional experiments.

The authors discuss the impact and particular values of parameters to optimize the delivery of NPs into tumor tissue. Garofalo et al present another methodology combining computer-aided drug design from the domain of computational chemistry and drug delivery techniques.²¹⁵ The multidisciplinary approach gives promising results in overcoming some of the main challenges, such as poor selectivity for the target or poor ADME properties. The authors discuss selected applications of the new approach, aiming to provide insights into a novel rational design of anticancer therapies. According to the authors, the computer-aided drug delivery system design should be combined with “wet” laboratory techniques that allow better prediction of drug delivery systems in vivo and helps in designing drug molecules that increase therapeutic targeting and reduce the optimal dosage.

Despite the fact that nanoparticles demonstrate excellent potential as drug delivery agents, the nano-protein interaction and the formation of a protein corona have been found to interfere with the nanoparticle delivery. In recently published studies, Zhang et al provided a brief summary of the latest developments on the nano-protein interactions between NPs and enzymes of the digestion and initiated an engaging discussion on the possibility of the use of the digestive enzyme corona for the targeted delivery in the colon.²¹⁶ The authors described physicochemical properties that are closely linked to the oral absorption of NPs, which include: size, zeta potential and surface molecules, which are greatly affected by the interaction of nano-enzymes and the formation of the enzyme corona. Moreover, it has been shown that the uptake of NPs by epithelial cells is significantly increased after the formation of the enzyme corona. The interaction of nano-enzymes is thus a major challenge for oral delivery of NPs and might exert an impact on pharmacological properties. On the other hand, a nano-enzyme interaction could also be applied to advanced oral delivery. As epithelial absorption of NPs is inhibited by the enzyme corona, a great number of NPs have a high chance of passing into the colon in the form of the NP-corona complex. After that, inside the colon, the enzyme corona and indeed NPs could be degraded and metabolized throughout the greatest microbiota in the organism, resulting in the release of loaded drugs straight into the colon area. The same problem has been previously discussed by Peng et al.²¹⁷ They synthesized the cationic NPs (CNPs) based on poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) and examined the interaction of CNPs with digestive enzyme and its impact on cellular uptake. Author’s results show for the first time the formation of the enzyme corona and its inhibitory effect on CNP uptake by epithelial cells. In another paper, Peng et al assessed the interaction between proteins and nanomaterials, which results that, in the in vivo performance of nanomaterials, are significantly different from these in vitro. It has been shown that the protein–nanomaterial interaction may induce remarkable changes in the properties of nanomaterials as well as their associated proteins.²¹⁸ These changes in properties will eventually lead to undesirable outcomes, which include: 1. Fast clearance of the bloodstream owing to opsonin adsorption; 2. Capillary blockage risk from the increased size after adsorption of serum proteins; 3. The loss of ability to target due to the original surface ligand being covered by the protein corona; 4. Possible toxicity due to the change in conformation of bound proteins. On the one hand, the above interactions are a major challenge for the safe and effective use of nanomaterials in clinical way, but, on the other hand, these interactions could be the possibility of decorating nanomaterial-based drug delivery systems. Consequently, in vivo transport and subsequent behavior of the protein-nanomaterial complex is much more controlled and indeed such a complex holds greater promise for being transferred to the practical products. In effect, it could be supposed that in the near future, these new smart products will be on the market for clinical use.

Toxicity of Drug Delivery Systems

Toxicity remains a challenge even when applying nanoparticles as drug carriers. Highly complex interactions between the molecules, cells, and the host environment are influenced by nanoparticles with many questions arising concerning their long-term safety.

Khan et al describe some of the potential NPs toxicities, which depend on various factors and types of particles used.²¹⁹ One of them, as pointed out by the authors, is the ability to organize around the protein concentration. This particular feature depends on particle size, curvature, shape and surface charge, functional groups, and free energy. Based on these properties, there is at least a theoretical possibility for NPs to generate adverse and unexpected outcomes through protein unfolding, crosslinking, or causing loss of enzymatic activity.

It becomes evident that despite the promising results and improvement of pharmacokinetic properties of anticancer drug-loaded NPs, long-term research and further studies must be rolled out to better understand complex interactions at the molecular level in vivo.

The Problems of Nanotechnology in Practical Use. The Limitations and Concerns of Different Types of Nanoparticles for Drug Delivery Applications

In view of this paper, the use of nanotechnology in practice may face some challenges. The biggest concern is that the health and safety implications of the specific properties of nanoparticles have not yet been addressed by the regulatory authorities. The new European chemicals policy REACH does not consider side effects. Nanoparticles raise a number of safety and regulatory issues that governments are now beginning to address. A review of recent regulations and ongoing monitoring by authorities is necessary.²²⁰ Moreover, some problems such as toxicity demonstrated by some nanoparticles cannot be overlooked when considering the application of nanomedicine in routine clinical practice. Recently, nanoparticles are mostly used together with natural products to reduce toxicity problems. The green chemistry pathway in the design of drug-containing nanoparticles is being extensively promoted due to the fact that it minimizes harmful components in the process of biosynthesis. Therefore, the use of “green” nanoparticles for delivering drugs can potentially reduce the side effects of drugs.¹⁸⁹

The use of an optimal nanoparticle drug delivery system is mainly determined by the biophysical and biochemical properties of the targeted drugs that are selected for treatment and could help to improve the successful delivery of nanosystems and optimize the pharmacoeconomic impacts.¹⁸⁹

Recently, various nanotechnology-based solutions for drug delivery in the field of medicine have attracted great interest. Despite the above, unfortunately there are still many concerns about the safety application of nanoparticles as drug delivery systems.²²¹

Studies carried out on nanotechnology have proven that every type of nanoparticles has some limitations in practical use. The NPs’ toxic effects are in general associated with the poor biocompatibility of the nanomaterials that were used to develop them. Carbon nanotubes (CNTs) are the type of NPs with more toxic potential observed. They have been found to be lung carcinogenic, but they are also toxic to CNS, blood and GIT. Heavy metals may accumulate in the liver and kidneys and can be toxic to the CNS and GIT. Silicates also have a significant potential to accumulate in the liver and lungs, leading to fibrosis. Direct toxicity of liposomes may be caused primarily by their size, charge or composition. For instance, cationic liposomes may interact with lipoproteins, serum proteins or even with the extracellular matrix, resulting in aggregation or release of agents that are loaded before they reach target cells, causing the systemic toxicity. At doses much higher than those administered (multiple injections of ≥100 mg/kg lipid), liposomes have been demonstrated to cause RES impairment, granulomas, hepatomegaly or even splenomegaly. Furthermore, the increase in lipid dose has been demonstrated to deplete plasma of different proteins. While the identification and importance of all deleted proteins remain unclear, it is possible that their loss will cause impairment in normal homeostasis. Metallic NPs could lead to peribronchitis, granulomas, interstitial fibrosis, collagen deposition, adenocarcinoma and pleural lesions. Nanoemulsions could be responsible for interference with the close linkage in GIT and direct cytotoxicity. Carbon NPs exhibit the oxidative stress, depletion of glutathione, an increase in the number of dermal cells, and also thickening of the skin and rash. Dendrimers and gold nanoshells demonstrate toxicity induced by macrophages, plasma protein depletion, aggregation of platelets and also their pathway of synthesis is complicated.²²²^,²²³

In view of the above, the awareness of particle levels that may cause health effects is imperative for both workers and exposed patients.²²²

Challenges in Pharmacoeconomic Aspects of Nanocarriers as Drug Delivery Systems

Nanomedicine adopts the use of nanotechnology for highly specific medical interventions for the prevention, diagnosis and treatment of diseases, all of which are presented in this paper. The development of nanomedicines tends to improve the therapeutic efficacy, reduce the dose that is therapeutically effective, and decrease the risk of developing side effects.²²⁴ Nanocarriers as DDS are designed to reduce the cost of administering the drug, improve the compliance and help patients to recover as soon as possible. All of these aspects are reflected in pharmacoeconomics, a discipline that aims to provide reliable information on the cost of therapies and to choose the best one, considering its effectiveness at the lowest possible costs. In the above paper, nanotechnology solutions and standard therapies, their costs and effectiveness were discussed.²²⁴

The clinical development of nanomedicine encompass many aspects, there are some key issues to look out for: biological development (appropriate in vivo structural stability of the nanomedicine after application); process of manufacturing (production on a large scale according to GMP standards, which includes: reproducibility, techniques, infrastructure, experience, and costs of the whole process; tests used to control the quality for characterization which includes: charge, size, morphology, dispersion, encapsulation, modification of the surface, stability and purity); biocompatibility and safety concerns (development of much more targeted toxicoassays for nanomedicines; appropriate understanding of nanocarriers interactions with cells and tissues; reduced level of nanoparticles accumulation in targeted cells, tissues or organs); intellectual property (understand of the nanomedicine patent complexity); government regulations (development of clear nanomedicine regulatory guidelines); and total cost-effectiveness compared to standard treatment regimens (restricted understanding of the nanomedicine’s biological interactions with the patient’s biological environment, leading to an impossibility to apply a pharmacoeconomic approach).^225–229

Such determinants could be substantial obstacles that limit the market emergence of nanomedicines, despite their therapeutic efficacy.

Conclusion

The availability of evidence resulting from the application of pharmacoeconomics can be useful in health policy decision-making. It can be applied by healthcare professionals such as policymakers, primary healthcare providers, health-care administrators, and health managers.

Pharmacoeconomics can certainly help in decision-making when evaluating the affordability and access to the right medication for the right patient at the right time, comparing alternative drugs from the same therapeutic class or drugs with a similar mechanism of action, and establishing accountability that the claims by a manufacturer regarding a drug are justified. Proper application of pharmacoeconomics will allow the pharmacy practitioners and administrators to make better and more informed decisions regarding the products and services.

Based on the published literature, the engagement of nanoforms at different stages, including prevention, diagnosis, and treatment, might provide significant benefits from an economic as well as treatment perspective. Those include but are not limited to the factors like faster diagnosis, increase in the viability of patients during antitumor therapy, overcoming the mechanisms of resistance in neoplastic cells, or enhancing therapeutic efficacy via synergistic or additive interactions.

The use of drug nanocarriers is a unique opportunity for an economically attractive improvement of known drugs because the development of novel nanoformulations is much cheaper and faster than the discovery of new drugs. Despite higher production costs, greater regulatory hurdles and difficult industrial transfer, they are worth the cost due to their numerous advantages.

Nanoencapsulation can increase the bioavailability of poorly soluble drugs, facilitate access to pathologically altered sites by improving the crossing of biological barriers and increased selectivity of drug-loaded nanocarriers, provide better storage and in vivo stability, and enable slow, controlled release of the drug in the human body. From a pharmaceutical and economic point of view, all of these benefits can reduce dose and associated toxicity, dosing frequency, side effects and costs, improve formulation, protect patents, and enhance patient compliance. In addition, the use of drug nanocarriers has found wide application in theranostics.

However, there are doubts about the use of drug carriers regarding the risks associated with the excess of nanocarriers used, such as high blood pressure or systemic toxicity. These side effects can be countered by selecting an appropriate carrier material as well as proper drug-carrier binding to ensure a low drug-to-carrier ratio in the formulation. Furthermore, changes in the stability and toxicity of carriers associated with industrial production can be avoided due to carefully optimized synthesis, including product control at every stage of its production, as well as the preparing guidelines for the synthesis of nanomaterials.

It is impossible to say which is better: discovering new drug nanocarriers or searching for new, more effective active substances. But surely to improve the well-known drugs with serious side effects through the use of their nanoformulations is very desirable and cost-effective from the point of view of pharmacoeconomics.

Nowadays, nanotechnology has many advantages, which includes: great bioadhesive properties, high biocompatibility, low toxicity, high encapsulation efficiency and also great drug-loading capacity. Analyzing the above features of nanoformulations it can be concluded that nanoparticles hold a huge potential as drug delivery systems, imaging agents and also in phototherapy. Despite these advantages, there still remain many issues that need to be resolved before nanoparticles can be used in a safe and comprehensive clinical way. Some aspects need further studies, such as: to the generation of nanoparticles with desired sizes; control of the thickness of each layer of the nanoparticles and the impact of it on the therapeutic efficacy; development of more stable nanoparticle; optimization of the drug release profile from nanomaterials; presently, the release rates differ significantly and depend on how drugs are integrated into nanomaterials (mostly by: surface adsorption, conjugation or encapsulation); safety and clinical applications; their biodistribution and long-term toxicity profile. Finally, to understand the mechanisms for metabolism, accumulation and biodegradation of nanoparticles in in vivo studies; discover interactions of nanoparticles with other materials, substances, drugs, and living organisms.

Furthermore, current studies have been limited to the in vitro stage and do not show in-depth toxicology and pharmacokinetic parameters. However, as time passes, the science and publication aspects are broadening, and we are getting much more data that allow us to evaluate and predict the effects of the nanocarriers formulations.

Moreover, from a manufacturing point of view, optimization of the synthesis parameter, encapsulation efficacy, and improved stabilization of nanoproducts will also provide a better understanding of their mode of action and potentially predict the risks of eventual use. In effect, it might be a substantial achievement in reducing the direct and indirect costs of therapy.

Undoubtedly, implementation of new therapeutic options, such as nanotherapy, will be associated with to date still unknown risks; however, expansion and development of the currently performed studies will consequently eliminate the existing gap in our knowledge and understanding of relevant mechanisms when applying nanotechnology to drug development and related costs.

Given the above, more attention should be paid to the pharmacoeconomic aspects of the nanocarriers, to properly assess the risk and benefit balance of the very promising technology presented in this review.

Funding Statement

National Science Centre, Poland, grant no. NCN/2016/21/B/ST5/01365 (AZW).

Abbreviations

5-FU, 5-Fluorouracil; p53, cellular tumor antigen p53; ABCB1, ATP-binding cassette subfamily B member 1; ACUPA, Acid-based protein-ligand; ADME, Absorption, distribution, metabolism, and excretion; AEs, adverse events; AgNPs, silver nanoparticles; AGuIX NPs, Polysiloxane gadolinium-chelates based nanoparticles; ALK, Anaplastic lymphoma kinase; ALT, Alanine aminotransferase; ANG 1005, Angiopep-2 paclitaxel conjugate; AST, Aspartate transaminase; ATC, Anatomical Therapeutic Chemical Classification System; ATC, Anaplastic thyroid cancer; AUC, Area under the curve; BBB, blood–brain barrier; BCL2L12, BCL-2-related proline-rich protein; BCRP, Breast cancer resistance protein; BiOBr NPs, Polyethylenimine grafted bismuth oxybromide nanoplates with Fe³⁺; BNPs, bioadhesive nanoparticles; BSA, Bovine serum albumin; C1-PNPs, pyridinium amphophile-loaded PLGA (poly (lactic-co-glycolic acid) nanoparticles; CA, Carcinoma antigen; CBA, Cost-benefit analysis; CCNG1, Cyclin-G1; CD NPs, Cyclodextrin nanoparticles; CEA, Cost-effectiveness analysis; Chk1, checkpoint kinase 1; CL, Clearance; CMA, Cost-minimization analysis; Cmax, the maximum concentration; CMCs, chemistry, manufacturing and controls; CNFs, carbon nanofibers; CNS, Central nervous system; CNTs, carbon nanotubes; CPSNPs, calcium phosphosilicate nanoparticles; CR, complete clinical response; CRC, colorectal cancer; CS@MoS₂, Chitosan-assisted MoS₂; CSC, cancer stem cells; CTC, circulating tumour cell; CTCAE, Common Terminology Criteria for Adverse Events; CUA, cost-utility analysis; CuS NPs, copper sulfide nanoparticles; DDSs, drug delivery systems; DKK4, Dickkopf WNT signaling pathway inhibitor 4; DMSO, Dimethyl sulfoxide; DNA, Deoxyribonucleic acid; DOX, Doxorubicin; DPYD, Dihydropyrimidine dehydrogenase; DLT, Dose-limiting toxicity; dvPtNPs, dualvalent platinum nanoparticles; ECG, Electrocardiogram; EGF, Epidermal growth factor; EORTC QLQ-C30, The European Organisation for Research and Treatment of Cancer Quality of Life 30-item questionnaire; EPR effect, enhanced permeability and retention effect; Eudragit S100, anionic copolymers based on methacrylic acid and methyl methacrylate; FACT-G, functional Assessment of Cancer Therapy – General questionnaire; FDA, Food and Drug Administration; FFPE, Formalin-fixed paraffin embedded; FKBP5, FKBP Prolyl Isomerase 5; FR, Folate receptor; GBM, Glioblastoma multiforme; GC, Gastric cancer; GIT, Gastrointestinal tract; GMP, Good manufacturing practice; GNR@LDH-PEG NPs, Poly(ethylene glycol) (PEG) modified core-shell GNR@ (gold nanorod) layered double hydroxide nanoparticles; GNSs, Gold nanospheres; GO, Graphene oxide; GR, Glucocorticoid receptor; GS, Glioblastoma stem-like cell cultures; GSH, Glutathione; GSH-AgNPs, Glutathione-stabilized silver nanoparticles; Gy, Gray (SI unit); HA, Hyaluronic acid; HAAH, Human aspartyl (asparaginyl) β-hydroxylase; (HA)-PBCA-NPs, hyaluronic acid coated poly(butyl cyanoacrylate) nanoparticles; HALMD, hydrophilic and aromatic low molecular weight drugs; HER2, human epidermal growth factor 2; HIF‐1α, Hypoxia-inducible factor 1-alpha; HO-GC, hydrotropic oligomer-conjugated glycol chitosan; HPG, Hyperbranched polyglycerol; HPG-C10-PEG, hyperbranched polyglycerol-C10- poly(ethylene glycol); ICER, Incremental cost-effectiveness ratio; ICPMS, inductively coupled plasma mass spectrometry; IONPs, Iron oxide nanoparticles; i.v., intravenosa; MDCK-MDR1, Madin darby canine kidney (MDCK) cells with the MDR1 gene; MDM2, mouse double minute 2 homolog; MDR, Multidrug resistance; MDR1, Multidrug-resistant 1 transporters; Mg(OH)₂ NPs, magnesium hydroxide nanoparticles; MIC, Minimum inhibitory concentration; MnO₂ NPs, Manganese oxide nanoparticles; MNPs, magnetic nanoparticles; MoS₂/PDA-RGD, molybdenum disulfide/polydopamine-arginine-glycine-aspartic acid; mPEG-CHO-chitosan NPs, Methoxypoly(ethylene glycol) conjugated chitosan nanoparticles; MPS, Mononuclear phagocyte system; MRI, Magnetic resonance imaging; MRSA, Methicillin-resistant Staphylococcus aureus; MTD, The maximum tolerated dose; MTT, The (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) tetrazolium reduction assay; mTOR, mechanistic target of rapamycin; NaCl, sodium chloride; NCI’s CTCAE, The National Cancer Institute Common Terminology Criteria for Adverse Events; NCs, Neocarzinostatin; NCQDs, Nitrogen-doped carbon quantum dots; NIH, National Institutes of Health; NIR, Near-infrared irradiation; NK 105, Paclitaxel-incorporating micellar nanoparticle formulation; NLCs, nanostructured lipid carriers; NPs, Nanoparticles; NRS-11, The Numeric Rating Scale; ORR, Overall response rate; OSA, Octyl-modified bovine serum albumin; OS, Overall survival; PBCA-NPs, Poly(butyl cyanoacrylate) nanoparticles; PCE, Tetrachloroethene; PCL, Poly(ε-caprolactone); PCMB-Dox NPs, PEGylated carborane-conjugated amphiphilic copolymer doxorubicin nanoparticles; PD, Pharmacodynamics; PD, Progressive disease; PDA-PEG-Van NPs, Polydopamine-based nanoparticles modified with PEG and vancomycin; PDCs, Polymer-drug conjugates; PDL1, programmed death-ligand 1; PDMAEMA, Poly(N-(2-(dimethylamino)ethyl)-methacrylate); PEG, Poly(ethylene glycol); PEG, Polyaspartate micellar nanoparticles; PEG-PCL, Poly(ethylene glycol)-poly(ε-caprolactone); PEG-PE, Poly(ethylene glycol)phosphatidyl ethanolamine; PEI-C18-HPG, polyethyleneimine (PEI)-C18-HPG; PET, Positron emission tomography; PFS, Progression free survival; PG, Pharmacogenomic; P-gp, permeability glycoprotein; pH, potential of hydrogen; PIPAC, Pressurized intraperitoneal aerosol chemotherapy; PK, Pharmacokinetics; PLA, Polylactide; PLD, PEGylated liposomal doxorubicin; PLGA, Poly(lactic-co-glycolic acid); PLGA-PEG, Poly(lactic acid-co-glycolic acid)-poly(ethylene glycol); PLMB-Dox NPs, Doxorubicin-loaded carborane-conjugated polymeric nanoparticles; PMMA, Poly(methyl methacrylate); p.o., Per os; PR, Partial response; PSMA, Prostate-specific membrane antigen; PSS, Poly(sodium 4-styrene sulfonate); PST-PTX, Poly(styrene)-paclitaxel; PTX, Paclitaxel; RECIST, Response Evaluation Criteria in Solid Tumours; RES, Renal reticuloendothelial system; rGO-Au NPs, Reduced-graphene-oxide functionalized with gold nanoparticles; RNA, Ribonucleic acid; ROS, Reactive oxygen species; RP2D, The recommended Phase II dose (in clinical trials); SAB, Staphylococcus aureus bacteremia; SAE, Serious adverse event; s.c., Subcutaneously; scFv, Single-chain fragment variable; SD, Stable disease; siRNA, Small interfering RNA; SLNs, solid lipid nanoparticles; SNA, Spherical nucleic acid; SNPs/SiNPs, silica nanoparticles; SPF, Sun protection factor; t1/2, Half-life; TDDSs, targeted drug delivery systems; TFAP2E, transcription factor AP-2 epsilon; TfR 1, transferrin receptor 1; Tmax, The time it takes to reach Cmax; Tri-Ag NPs, Citrate-coated triangular nanoparticles; Tv-Ag NPs, Toxicodendron vernicifluum silver nanoparticles; UPLC-MS/MS, Ultra-performance liquid chromatography–tandem mass spectrometry; UV, Ultraviolet; VAS, Vasectomy; VCAMs, vascular cell adhesion molecules; VEGFs, vascular endothelial growth factors; Vd, volume of distribution; VOI, volumes of interest; QALYs, quality-adjusted life-years.

Disclosure

The authors declare no conflicts of interest in this work.

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PERMALINK

Current Trends and Challenges in Pharmacoeconomic Aspects of Nanocarriers as Drug Delivery Systems for Cancer Treatment

Sylwia Milewska

Katarzyna Niemirowicz-Laskowska

Gabriela Siemiaszko

Piotr Nowicki

Agnieszka Z Wilczewska

Halina Car

Abstract

Introduction

Figure 1.

Pharmacoeconomics – a Use Case of Nanocarriers Evaluation

Table 1.

Table 2.

Table 3.

The Cancer Burden in the World

Figure 2.

Table 4.

Different Aspects of the Use of Nanocarriers – Prevention, Diagnostic and Therapeutic Application

Figure 3.

Table 5.

Treatments Using Drug Delivery Systems

Figure 4.

Improving Drug Solubility

Targeted Drugs Delivery – the Passive and Active Crossing of Biological Barriers

Increasing Drug Stability and Controlled Release

The Efficiency of Encapsulation/Immobilization of Drugs in Carriers

Application, Mechanism of Action, and Drug-Resistance of Selected Chemotherapeutics

Improving Activity and Help to Overcome the Drug-Resistance

Figure 5.

Table 6.

Pharmacoeconomic Aspect of Drug Carriers

Table 7.

Clinical Application of Drug Carriers

Table 8.

Table 9.

Business Criteria for the Development of Drug Carriers

Reducing Cost/Reagents/Green Synthesis

Transfer of Drug Carriers Synthesis Methods from Lab to Industry - Challenges

Green Synthesis in Drug Carriers Manufacturing

Pharmacokinetic and Toxicological Studies of Nanoparticles as a Delivery System

Pharmacokinetic Aspect of the Application of Nanoparticles as Delivery Systems

Table 10.

Figure 6.

Toxicity of Drug Delivery Systems

The Problems of Nanotechnology in Practical Use. The Limitations and Concerns of Different Types of Nanoparticles for Drug Delivery Applications

Challenges in Pharmacoeconomic Aspects of Nanocarriers as Drug Delivery Systems

Conclusion

Funding Statement

Abbreviations

Disclosure

References

ACTIONS

PERMALINK

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