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. 2013 May 27;6:585–591. doi: 10.2147/OTT.S44406

Nanoparticle albumin-bound paclitaxel combined with cisplatin as the first-line treatment for metastatic esophageal squamous cell carcinoma

Yan Shi 1, Rui Qin 1, Zhi-Kuan Wang 1, Guang-Hai Dai 1,
PMCID: PMC3668960  PMID: 23737672

Abstract

Esophageal cancer is a major health hazard in many parts of the world and is often diagnosed late. The objective of this study was to explore the efficacy and safety of nanoparticle albumin-bound paclitaxel (Nab-PTX) combined with cisplatin (DDP) in patients with metastatic esophageal squamous cell carcinoma (ESCC). Patients with histologically confirmed ESCC were treated with Nab-PTX 250 mg/m2 and DDP 75 mg/m2 intravenously on day 1, every 21 days. Evaluation was performed after every two cycles of therapy and the therapy was continued until disease progression or unacceptable toxicity. From April 2010 to December 2012, 33 patients were enrolled. Ten patients had recurrent and metastatic tumors after surgery and 23 patients were diagnosed with unresectable metastatic disease. Patients received a median of four cycles of therapy (ranging from two to six cycles). Twenty patients achieved partial response and nine patients achieved stable disease; no complete response was observed. The objective response rate was 60.6% and the disease control rate was 87.9%. The median progression-free survival was 6.2 months (95% confidence interval: 4.0 to 8.4 months) and the median overall survival was 15.5 months (95% CI: 7.6 to 23.4 months). Only four patients experienced grade 3 adverse events, including vomiting, neutropenia, and sensory neuropathy. The most common adverse events were nausea/vomiting (81.8%), neutropenia (63.6%), leucopenia (48.5%), anemia (24.2%) and sensory neuropathy (24.2%). In conclusion, the combination of Nab-PTX and DDP is a highly effective and well-tolerated first-line treatment in metastatic ESCC.

Keywords: esophageal squamous cell carcinoma, nanoparticle albumin-bound paclitaxel, chemotherapy, metastasis

Introduction

Esophageal cancer is one of the most common cancers, and is also a major cause of cancer-related mortality worldwide.1 Esophageal squamous cell carcinoma (ESCC) may be associated with a worse prognosis after surgery than esophageal adenocarcinoma.2 Due to few symptoms at the initial phase and the aggressive nature of esophageal cancer, advanced/metastatic cases with unresectable tumors and recurrent cases after resection are frequently observed. For those patients with unresectable esophageal tumor or metastatic disease, taxane- and platinum-based regimens, as well as fluoropyrimidine-based regimens, have been proven to be reasonable and effective first-line chemotherapy.35 However, the median survival is only 8–12 months in patients with advanced/metastatic ESCC, regardless of which combined regimen is given, such as 5-fluorouracil (Fu) plus cisplatin (DDP)/oxaliplatin (OXA),3,6 or paclitaxel (PTX) or docetaxel (TXT) plus carboplatin/DDP.7,8 Recently, although triple-drug regimens, such as 5-Fu/capecitabine, DDP, and TXT, have shown some efficacy advantages for advanced/metastatic ESCC, their long-term outcome advantages are not obvious due to higher incidences of grade 3 or 4 toxicity.911 Therefore, it is very important to explore more effective but less cytotoxic regimens for systemic treatment to achieve consistent survival improvement in advanced/metastatic ESCC.

The 130 nm nanoparticle albumin-bound PTX (Nab-PTX [Abraxane]; Celgene Corporation, Summit, NJ, USA) is a novel, solvent-free PTX that uses albumin to deliver PTX, thus avoiding the need for solvents such as polyoxyethylated castor oil and ethanol. The solvents used for conventional taxanes can lead to serious toxicities such as hypersensitivity reaction and peripheral neuropathy, requiring premedication with steroid and antihistamine,12 and can limit drug amount and bioavailability. Thus, theoretically, the solvent-free Nab-PTX should be a more effective and less toxic reagent than conventional taxanes. Preclinical models suggest that Nab-PTX may reach tumors more efficiently with enhanced accumulation than solvent-based taxane.13 Clinical studies have shown that Nab-PTX is safe with increased objective response rate (ORR) and time to progression in metastatic breast cancer compared with solvent-based PTX and TXT, and great activity has also been shown in various other advanced solid tumors, including non-small-cell lung cancer (NSCLC) and pancreatic cancer.1417 Therefore, Nab-PTX has been an alternative reagent for those cancers that could be treated with PTX or TXT. However, little is known about the safety and efficacy of Nab-PTX in combination with DDP in ESCC. The objective of this study was to explore the efficacy and toxicity of Nab-PTX combined with DDP as the first-line chemotherapy for patients with metastatic ESCC.

Materials and methods

Patients

Patients with metastatic ESCC were enrolled in this study based on the following criteria: (1) histologically confirmed ESCC and classified as unresectable esophageal cancer with metastatic lesions or recurrent and metastatic ESCC after surgery; (2) age < 70 years and a life expectancy of >8 weeks; (3) at least one measurable lesion for assessment by computed tomography (CT) or magnetic resonance imaging (MRI), and no prior radiotherapy or other local treatment for parameter lesions, including primary and metastatic lesions; (4) No prior chemotherapy for metastatic disease. Previous chemotherapy without taxane as adjuvant treatment is acceptable, if the adjuvant chemotherapy has been completed at least 6 months before entry into in this study; (5) an Eastern Cooperative Oncology Group performance status (ECOG PS)18 of 0–2; (6) adequate hematological (absolute neutrophil count ≥ 1.5 × 109/L, platelets ≥ 100 × 109/L, and hemoglobin ≥ 9 g/dL), hepatic (total bilirubin < 1.5-fold of the upper limit of normal value, aspartate aminotransferase and alanine aminotransferase < 1.5-fold of the upper limit of normal value), and renal (blood urea nitrogen and serum creatinine < the upper normal level) functions; (7) no other active malignancies.

This study was conducted according to the principles of the Declaration of Helsinki and International Conference on Harmonisation Good Clinical Practice guidelines. Written informed consent was obtained from all patients. Moreover, the protocol of study was reviewed and approved by the ethical board of CPLA General Hospital.

Protocol treatment

Nab-PTX was administered intravenously over 30 minutes at 250 mg/m2 without corticosteroid or antihistamine premedication,12 followed by DDP 75 mg/m2 administered intravenously for 2 hours on day 1, every 21 days. The rationale of dosing Nab-PTX was based on a Phase III study, in which Nab-PTX was given at 260 mg/m2 every 3 weeks as a single agent for patients with metastatic breast cancer.15 In the current study, the dosage of Nab-PTX was reduced to 250 mg/m2 every 3 weeks due to combination with DDP. For patients experiencing intolerable toxicities, treatment was to be interrupted for up to 42 days, allowing them to recover from the adverse events. When Common Toxicity Criteria (CTC) grade 3/4 symptoms resolved, chemotherapy was reduced to 75% of the previous dose. Any patient requiring > 42 days of recovery time or more than two dose reductions due to toxicity was to be discontinued from the study. In general, treatment continued until disease progression, unacceptable toxicity, two cycles after maximal response, or a maximum of eight cycles, at the discretion of the treating physician.

Efficacy and toxicity evaluation

Baseline tumor measurements were taken no more than 14 days before treatment. The objective of this study was to determine the response rate as well as safety of Nab-PTX in combination with DDP in patients with metastatic ESCC. Therefore, the primary end point was ORR. The secondary end points were disease control rate (DCR), progression-free survival (PFS), overall survival (OS), and safety. Evaluation of tumor response was performed with the same imaging technique that was used at baseline every two cycles of therapy according to Response Evaluation Criteria in Solid Tumors (RECIST),19 and every 12 weeks within the follow-up period until disease progression. The safety measures, including adverse events, physical examinations, and clinical laboratory tests (hematology, blood chemistry, hepatic functions, and renal functions) were completed before each cycle. Toxicities were graded using version 3.0 of the National Cancer Institute Common Toxicity Criteria.20

Statistical analysis

Descriptive statistics were used for patient characteristics, treatments, and safety evaluation. Mean values and standard deviations (SDs) were provided for continuous end points and frequency and percentage distributions were provided for discrete data. ORR, DCR, and their two-sided 95% confidence intervals (CIs) were calculated. PFS was defined as the duration from the initial treatment day of the protocol until the day of disease progression, or until the last follow-up day, or until death. Similarly, OS was defined as the duration from the initial treatment day of the protocol until death due to any cause or until the last follow-up day. PFS and OS were estimated using the Kaplan–Meier method and their medians, along with two-sided 95% CIs, were calculated. All analyses were performed using the SPSS software package (v 16.0; IBM Corporation, Armonk, NY, USA).

Results

Patient characteristics

A total of 33 patients with metastatic ESCC were enrolled in this study between April 2010 and December 2012. The baseline patient characteristics are summarized in Table 1. Only two patients had received adjuvant chemotherapy without taxane agent 12 months before entering this study. The predominant sites of metastatic disease were distant lymph nodes in 31 cases (93.9%) and organ metastases in 16 cases (48.5%).

Table 1.

Baseline characteristics of enrolled patients (n = 33)

Characteristic Number (%)
Age (years)
 Median 56
 Range 43–70
Sex
 Male 30 (90.9)
 Female 3 (9.1)
ECOG performance status
 0 22 (66.7)
 1 11 (33.3)
Patient status
 Recurrence/metastases after surgery 10 (30.3)
 Unresectable tumor with metastases 23 (69.7)
Differentiation
 Good 4 (12.1)
 Moderate 13 (39.4)
 Poor 14 (42.4)
 Unknown 2 (6.1)
Number of metastatic sites
 1 12 (36.4)
 2 15 (45.5)
 ≥3 6 (18.2)
Site of metastatic disease
 Lung 10 (30.3)
 Liver 5 (15.2)
 Bone 5 (15.2)
 Distant lymph nodes 31 (93.9)
 Other organ metastases 2 (6.1)

Abbreviation: ECOG, Eastern Cooperative Oncology Group.

Efficacy and survival

A total of 138 cycles of Nab-PTX in combination with DDP were administered. The median number of cycles of chemotherapy per patient was four (ranging from two to six cycles). Twenty-six (78.8%) of 33 enrolled patients received at least four cycles of chemotherapy. Of the 33 patients, no complete response (CR) was observed, whereas 20 patients achieved partial response (PR) and nine patients achieved stable disease (SD). Only four patients had progressive disease (PD). The ORR (CR + PR) was 60.6% and the DCR (CR + PR + SD) was 87.9% (Table 2). The median PFS was 6.2 months (95% CI: 4.0 to 8.4 months) and median OS was 15.5 months (95% CI: 7.6 to 23.4 months) (Figures 1 and 2).

Table 2.

Response for patients treated with Nab-PTX and DDP

Response Number (%) 95% confidence interval
Complete response
Partial response 20 (60.6) 48.5–81.8
Stable disease 9 (27.3) 12.1–45.4
Progressive disease 4 (12.1) 3.0–30.3
Objective response rate 20 (60.6) 48.5–81.8
Disease control rate 29 (87.9) 69.7–97.0

Abbreviations: DDP, cisplatin; Nab-PTX, nanoparticle albumin-bound paclitaxel.

Figure 1.

Figure 1

Progression-free survival curves for metastatic esophageal cancer patients treated with nanoparticle albumin-bound paclitaxel plus cisplatin (n = 33).

Figure 2.

Figure 2

Overall survival curves for metastatic esophageal cancer patients treated with nanoparticle albumin-bound paclitaxel plus cisplatin (n = 33).

Toxicity

The hematologic and nonhematologic toxicities associated with the combined chemotherapy are summarized in Table 3. In general, the regimen of Nab-PTX combined with DDP was well tolerated and most adverse events were mild. No unexpected toxicities or treatment-related deaths were observed during this study. Twenty-nine (87.9%) patients were reported as having at least one adverse event during the study, and only four patients experienced grade 3 adverse events, including vomiting (male, 49 years, six cycles), neutropenia (two cases, both male and four cycles, 70 and 56 years) and sensory neuropathy (male, 60 years, four cycles). The most common adverse events were nausea/vomiting (81.8%), neutropenia (63.6%), leucopenia (48.5%), anemia (24.2%), and sensory neuropathy (24.2%). Four patients (12.1%) experienced dose reductions due to adverse events during their therapy.

Table 3.

Toxicity (n = 33)

Adverse event, N (%) Grade 1 Grade 2 Grade 3 Grade 4
Leucopenia 7 (21.2) 8 (24.2) 1 (3.0)
Neutropenia 13 (39.4) 7 (21.2) 1 (3.0)
Thrombocytopenia 1 (3.0)
Anemia 8 (24.2)
Sensory neuropathy 5 (15.2) 2 (6.1) 1 (3.0)
Bilirubin 2 (6.1) 1 (3.0)
Nausea/vomiting 15 (45.5) 11 (33.3) 1 (3.0)
Fever
Hepatic functions 1 (3.0)

Discussion

For patients with incurable advanced/metastatic esophageal cancer who experience unresectable regional relapse or distant metastasis after esophagectomy, there are few regimens recommended as first-line therapy. In the absence of adequately powered Phase III trials for many years, the major regimens listed in the National Comprehensive Cancer Network Guideline of esophageal cancer are mainly derived from advanced gastric cancer Phase III trials including lower esophageal and esophagogastric junction (EGJ) cancer.21,22 However, the main histological cancer type in advanced gastric cancer, lower esophageal, and EGJ cancer is adenocarcinoma and not SCC;23 SCC is different from adenocarcinoma of the esophagus in biological characteristics, drug sensitivity, and prognosis.2,24,25 Thus, it is important to find effective regimens for metastatic ESCC. It is reported that taxane-based regimens have demonstrated high clinical activities and survival advantages in metastatic ESCC,2631 and it was hypothesized that replacing PTX with solvent-free Nab-PTX might provide even better clinical benefits to patients with metastatic ESCC. Therefore, in this study, a novel formulation of Nab-PTX was explored for combination with DDP as a first-line regimen for patients with metastatic ESCC.

In the 33 patients treated in this study, the regimen of Nab-PTX plus DDP showed promising efficacy, with an ORR of 60.0%, a DCR of 87.9%, a median PFS of 6.2 months, and a median OS of 15.5 months. This regimen was also well tolerated, and toxicity was manageable. The most common toxicity related to DDP was nausea/vomiting, as expected. Hematological toxicity, especially myelosuppression, was slighter compared with previous studies on taxane-based regimens in esophageal cancer.5,26 Only four patients experienced grade 3 adverse events. Although this study had no control arm, the results were consistent with other previously reported studies2636 in metastatic ESCC, which are summarized in Table 4. Between 2005 and 2011, there were only 11 studies on first-line chemotherapy in metastatic ESCC. The most frequently investigated regimens were PTX-based, TXT-based, platinum-based, and 5-Fu/capecitabine-based in those studies, with ORR ranging from 13%–75%, PFS ranging from 3.6 months to 7.0 months, and OS ranging from 5.5 months to 14.3 months. Although, in the current study, the ORR and PFS were similar to those of other studies, a longer median OS, of 15.5 months, was observed. ECOG PS of patients, mild side effects of the regimen, and subsequent treatments for most patients (87.9% patients receiving subsequent treatment after progression) may have contributed to better OS in our study. Moreover, the favorable safety profile and greater median OS may be partially explained by higher intracellular delivery of PTX through the albumin-based nanoparticle technology and its utilization of the glycoprotein (gp)60–caveolin1–secreted protein acidic and rich in cysteine (SPARC) pathway across the endothelial barrier.13,37,38 SPARC, an albumin-binding protein, is overexpressed and secreted in many cancers and is a prognostic factor for poor survival in a number of tumor types. The gp60-mediated endothelial cell transcytosis of albumin-bound PTX and subsequent albumin binding to SPARC enhances the penetration of Nab-PTX into the tumor interstitium, thus PTX accumulation in tumor was greater for Nab-PTX compared with traditional PTX in tumor mouse models.13,37,38

Table 4.

Comparison of current study with other reports on first-line chemotherapy regimens for metastatic ESCC

Regimen N ORR (%) PFS/TTP (months) OS (months) Author
Nab-PTX+DDP 33 60.6 6.2 15.5 Current study
PTX+CAP
1st line 12 75.0 5.23 14.3 Yun et al26
2nd line 20 45.0 4.54 8.4
CAP+DDP 72 51.4 4.2 12.0 Lee et al32
TXT+DDP+5-Fu 39 66.6 7.0 13.0 Takahashi et al27
ADM+5-Fu+DDP 41 43.9 NR 10.2 Honda et al33
PTX+NDP (ESCC = 46) 48 41.7 6.1 11.5 Cao et al28
PTX+NDP (ESCC = 33) 36 43.6 6.1 10.3 Gong et al29
5-Fu+DDP 32 13.0 3.6 5.5 Lorenzen et al34
5-Fu+DDP+cetuximab 32 19.0 5.9 9.5
OXA+CAP 64 43.8 4.0 10.0 Qin et al35
CAP+DDP 45 57.8 4.7 11.2 Lee et al36
PTX+DDP 35 48.6 7.0 13.0 Zhang et al30
TXT+DDP
ESCC 10 40.0 4.3 6.9 Laack et al31
EADC 6 20.0

Abbreviations: 5-Fu, 5-fluorouracil; ADM, doxorubicin; CAP, capecitabine; DCR, disease control rate; DDP, cisplatin; EADC, esophageal adenocarcinoma; ESCC, esophageal squamous cell carcinoma; N, number; Nab-PTX, nanoparticle albumin-bound paclitaxel; NDP, nedaplatin; NR, not reported; ORR, objective response rate; OS, overall survival; OXA, oxaliplatin; PFS, progression-free survival; TTP, time to progression; TXT, docetaxel; PTX, paclitaxel.

Several studies19,20,3941 have investigated Nab-PTX as a single agent or in combination in breast cancer, NSCLC, and pancreatic cancer. Nab-PTX always showed high efficacy and was well tolerated when combined with capecitabine, bevacizumab, gemcitabine, carboplatin, and trastuzumab, respectively. Our study reported that Nab-PTX plus DDP showed high activity and mild side effects in metastatic ESCC. Although it is difficult to draw the conclusion that the Nab-PTX plus DDP regimen is better than other regimens, considering the small sample size and lack of control arm, this regimen could be a good option and deserves further investigation as first-line chemotherapy for metastatic ESCC.

Conclusion

The combination of a new formulation, Nab-PTX, and DDP, seems to be a highly effective and well-tolerated first-line regimen for metastatic ESCC. The rate of grade 3–4 toxicities was very low. Further prospective randomized clinical trials with a larger sample size are necessary to obtain more evidence to determine the efficacy and safety of Nab-PTX and DDP for metastatic ESCC.

Author contributions

All authors contributed substantially to the study. Yan Shi contributed to the design of the study, recruitment of patients, data analysis, and writing and revision of the manuscript. Rui Qin and Zhi-Kuan Wang contributed to patient recruitment, collection, acquisition and analysis of data as well as writing and revision of the manuscript. Guang-Hai Dai contributed to design of the study, critical revision of the manuscript, and financial support prior to publication. All authors read and approved the final manuscript.

Acknowledgments

This work was supported by Medical Project of Jie-Ping Wu Fund of China (Guang-Hai Dai, 320.6750.1233). The authors wish to acknowledge all the staff at the study center who contributed to this study. We are also grateful to the Department of Multimodality Therapy of Oncology and Department of Medical Oncology at CPLA General Hospital.

Footnotes

Disclosure

The authors report no conflicts of interest in this work.

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