Abstract
Introduction
The development of several effective biological drugs for moderate-to-severe plaque psoriasis has dramatically changed the lives of patients. Despite the wide use of interleukin (IL) inhibitors, limited data are available to date regarding long-term treatment persistence.
Method
This multicenter retrospective real-world study evaluated 5932 treatment courses across 5300 patients, all treated with interleukin inhibitors. Drug survival was expressed by using the Kaplan-Meier estimator for each biological drug at 6, 12, 24, 36 and 48 months. We also stratified by discontinuation associated with primary or secondary ineffectiveness.
Results
In our study, the most prescribed drugs were secukinumab (1412), ixekizumab (1183), and risankizumab (977). After four years of follow-up, risankizumab emerged as the treatment with the highest drug survival overall, as 91.6% of patients were still on treatment. The overall probability of drug survival at four years was comparable for tildrakizumab (83.5%), ixekizumab (82.6%), guselkumab (82.4%) and brodalumab (81.8%). When evaluating only patients who discontinued the treatment because of ineffectiveness, once again risankizumab was the molecule with the highest drug survival at 4 years (93.4%), this time followed by ixekizumab (87%). Our study, in which all IL inhibitors were adequately represented, confirmed a slightly better treatment persistence for IL-23 inhibitors, consistent with other real-world studies.
Conclusion
Our experience showed that IL-23 inhibitors, and risankizumab in particular, had a higher probability of drug survival overall during a 4-year follow-up. Risankizumab and ixekizumab were less likely to be discontinued because of ineffectiveness after four years.
Keywords: IL-inhibitors, immunomodulatory therapies, inflammatory skin diseases, psoriasis, psoriasis treatment
1. Introduction
Psoriasis is a chronic immune-mediated disease affecting up to 3% of the population worldwide (1). It is a condition that primarily affects the skin and joints and can severely impact patients’ quality of life and their productivity. The development of different biological treatments has dramatically changed the lives of patients affected by moderate-to-severe plaque psoriasis (1). In Italy, several biological drugs are approved for the treatment of these patients. In particular, interleukin (IL) inhibitors include drugs targeting IL-12/23 (ustekinumab), IL-17 (secukinumab, ixekizumab, brodalumab and bimekizumab) and IL-23 (guselkumab, risankizumab and tildrakizumab). These molecules have shown high efficacy and safety profiles in both clinical trials and real-world experiences, supporting the wide use of biologics in wide cohorts of patients with moderate-to-severe plaque psoriasis (2). Currently, the switch among biologics is becoming more common due to several reasons, including ineffectiveness and adverse events. Patients’ preferences also play a role in the decision to switch treatments. Because of that, it is crucial to evaluate the drug survival of these molecules since it seems to correlate with clinical response and tolerability in a real-world setting. This is particularly important if we consider that it has been shown that bio-naïve patients and those with a very short disease duration (less than two years) are more likely to have better clinical response to some molecules (3, 4). Hence, it is crucial to choose the best possible drug for each patient in order to achieve better outcomes. Current Guidelines do not give any specific recommendations regarding which biological drug should be used as a first-line treatment for each type of patient in terms of disease severity, involvement of difficult-to-treat areas, or presence of cardiometabolic comorbidities (5). Italian Guidelines provide limited evidence for the use of specific classes of biologics for some patients’ subpopulations. As a matter of fact, patients with concomitant psoriatic arthritis (PsA), should be treated with anti-TNF-alfa or anti-IL-17 drugs, while those with a diagnosis or medical history of inflammatory bowel disease should not receive IL-17 inhibitors. Regarding all other medical conditions, no strong recommendations are currently available (6). For all these reasons, during the last years, a few studies on treatment persistence have been published, showing a higher drug survival for patients treated with IL-23 inhibitors (7–10). However, limited data are available in particular for the most recently approved treatments, such as tildrakizumab and risankizumab. More research is needed to evaluate these drugs’ effectiveness and safety profiles in a real-world setting.
2. Method
We conducted a retrospective real-world study to assess the drug survival of IL-inhibitors in plaque psoriasis, across 5300 patients and 5932 treatment courses, with a 4-year follow-up. Patients were followed from 1st January 2012 to 31st December 2022 at 15 Italian Dermatology Units. Patients who discontinued a drug and started another treatment were included in the analysis as a new treatment course with a re-evaluation of all baseline characteristics. Drug survival was expressed by using the Kaplan-Meier estimator for each biological drug at 6, 12, 24, 36 and 48 months. We also stratified by discontinuation associated with primary or secondary ineffectiveness. The date of the event was defined as the date the patient discontinued the biologic for any reason. Time data was censored for patients who were still on treatment when the study was conducted. We also used the log-ranked test to assess the differences in drug survival between the subgroups. To describe demographic characteristics, we used mean and Standard Deviation (SD) for continuous variables and absolute frequency and percentage for categorical parameters. STATA/SE 17.0 software was used to conduct the data analysis and to generate graphs. For this retrospective study, institutional review board approval was waived as the study protocol did not deviate from routine clinical practice. In this study, we did not perform any procedure differently from routine clinical practice. All patients included in the study had provided written consent for retrospective analysis of anonymous data collected during routine clinical practice, including demographics and clinical severity scores. This study was conducted in accordance with the Helsinki Declaration of 1964 and its later amendments.
3. Results
The demographic characteristics of our cohort at the start of the treatment are available in Table 1 .
Table 1.
Total patients | 5300 |
Treatment courses | 5932 |
Mean ± SD | |
Age, years | 53.74 ± 14.85 |
BMI, kg/m2 | 27.31 ± 5.29 |
PASI at Baseline | 14.42 ± 7.08 |
N (%) | |
Male | 3898 (65.71) |
PsA | 1330 (22.42) |
CMD | 2919 (49.21) |
Difficult-to-treat Areas | 2716 (45.79) |
Bio-Naïve | 2744 (46.26) |
Current Biological Drug | |
Ustekinumab | 347 (5.85) |
Brodalumab | 676 (11.40) |
Secukinumab | 1412 (23.80) |
Ixekizumab | 1183 (19.94) |
Tildrakizumab | 488 (8.23) |
Risankizumab | 977 (16.47) |
Guselkumab | 849 (14.31) |
BMI, Body Mass Index; PsA, Psoriatic arthritis; PASI, Psoriasis Area and Severity Index; CMD, cardiometabolic diseases; SD, Standard Deviation.
Three thousand eight-hundred and ninety-eight patients were males (65.71%), with a mean age of 53.74 years (SD 14.85). The vast majority of our patients were Caucasians, and no other ethnicity was significantly represented in our cohort. A concomitant psoriatic arthritis (PsA) was diagnosed by rheumatologists in 1330 patients (22.42%), according to CASPAR (ClASsification of Psoriatic ARthritis) classification criteria (11). Two thousand nine hundred and nineteen patients (49.21%) presented with at least one cardio-metabolic comorbidity (including obesity, arterial hypertension, hypercholesterolemia, type II diabetes mellitus and cardiovascular diseases). At baseline, our patients had a mean body mass index (BMI) of 27.31 (5.29). The mean Psoriasis Area and Severity Index (PASI) at the start of the biological treatment was 14.42 (7.08), comparable with other real-world experiences. Two thousand seven hundred and sixteen patients (45.79%) had the involvement of at least one difficult-to-treat area (including scalp, palms/soles, nails and genitalia). Slightly less than half of our patients were naïve to biological treatments (46.26%). Regarding current treatment courses, the most common drug was secukinumab (1412 [23.80%]), followed by ixekizumab (1183 [19.44%]), risankizumab (977 [16.47%]), guselkumab (849 [14.31%]), brodalumab (676 [11.40%]), tildrakizumab (488 [8.23%]) and ustekinumab (347 [5.85%]). One thousand and fifty-one patients discontinued the biological therapy during the observation period. The causes of treatment discontinuation were: primary ineffectiveness (182 treatment courses, 3.07%), loss of effectiveness (660, 11.29%), treatment-emerging adverse events (60, 1.01%), patient’s decision (17, 0.29%) and loss of follow up (138, 2.33%). The baseline characteristics of our patients, stratified by biological treatment, are shown in Table 2 . Remarkable differences among the biological cohorts included the proportion of bio-naïve patients (ustekinumab 17.87%; guselkumab 30.15%; brodalumab 47.78%; ixekizumab 49.28%; secukinumab 49.93%; risankizumab 50.46%; tildrakizumab 65.98%) and the proportion of patients with PsA (tildrakizumab 12.70%; risankizumab 13.61%; ustekinumab 17%; brodalumab 17.46%; guselkumab 19.20%; secukinumab 30.03%; ixekizumab 31.36%).
Table 2.
Brodalumab | Ixekizumab | Secukinumab | Guselkumab | Risankizumab | Tildrakizumab | Ustekinumab | |
---|---|---|---|---|---|---|---|
Total | 676 | 1183 | 1412 | 849 | 977 | 488 | 347 |
Mean ± SD | |||||||
Age, years | 54.22 ± 15.24 | 53.04 ± 14.65 | 54.71 ± 14.30 | 51.84 ± 14.98 | 52.40 ± 14.79 | 56.03 ± 15.75 | 56.51 ± 14.40 |
BMI, kg/m2 | 26.85 ± 5.03 | 27.48 ± 5.25 | 27.06 ± 4.81 | 27.26 ± 5.46 | 27.73 ± 5.69 | 26.82 ± 5.00 | 28.13 ± 6.16 |
PASI at Baseline | 14.95 ± 7.30 | 15.49 ± 7.19 | 14.80 ± 6.23 | 12.50 ± 7.54 | 15.47 ± 7.30 | 12.64 ± 6.06 | 12.11 ± 7.26 |
N (%) | |||||||
Male | 469 (69.38) | 762 (64.41) | 914 (64.73) | 552 (65.02) | 669 (68.47) | 311 (63.73) | 221 (63.69) |
PsA | 118 (17.46) | 371 (31.36) | 424 (30.03) | 163 (19.20) | 133 (13.61) | 62 (12.70) | 59 (17.00) |
CMD | 317 (46.89) | 548 (46.32) | 666 (47.17) | 419 (49.35) | 525 (53.74) | 246 (50.41) | 198 (57.06) |
Difficult-to-treat Areas | 245 (36.24) | 578 (48.86) | 617 (43.70) | 480 (56.54) | 357 (36.54) | 206 (42.21) | 233 (67.15) |
Bio-Naïve | 323 (47.78) | 583 (49.28) | 705 (49.93) | 256 (30.15) | 493 (50.46) | 322 (65.98) | 62 (17.87) |
BMI, Body Mass Index; PsA, Psoriatic arthritis; PASI, Psoriasis Area and Severity Index; CMD, cardiometabolic diseases; SD, Standard Deviation.
At 1-year, anti-IL 12/23 and anti-IL 23 drugs showed a higher drug survival overall, compared with IL-17 inhibitors ( Figure 1 ). After four years of follow-up, risankizumab had the highest drug survival overall, as 91.6% of patients were still on treatment with a confidence interval (95% C.I.) of 89.3-93.4. The overall probability of drug survival at four years was comparable for tildrakizumab (83.5%, with a 95% C.I. of 78.1-87.7), ixekizumab (82.6%, 79.9-84.9), guselkumab (82.4%, 76.4-86.5) and brodalumab (81.8%, 75.6-86.6). Secukinumab had a probability of drug survival of 74.7% (72.1-77.0) and ustekinumab of 67.8% (62.6-72.5) ( Figure 1 ). We then described the drug survival of all molecules evaluating only the treatment discontinuations due to ineffectiveness, as shown in Figure 2 . In this analysis, after one year, risankizumab was still the drug with the better performance, as 96.5% of patients (95.1-97.5) were still on treatment after 12 months. It was followed by ustekinumab (96%, 93.3-97.6), ixekizumab (95.6%, 94.3-96.7) and tildrakizumab (95.5%, 93.1-97.1) ( Figure 2 ). Regarding this sub-analysis, once again risankizumab emerged as the molecule with the highest drug survival at 4 years (93.4% 91.2-95.0), this time followed by ixekizumab (87%, 84.5-89.1), guselkumab (86.3%, 81.1-90.2), brodalumab (86.2%, 80.5-90.3), tildrakizumab (85.7%, 80.2-89.7), secukinumab (78.6%, 76.1-80.8) and ustekinumab (70%, 64.8-74.6) ( Figure 2 ). The log-rank test showed no difference in drug survival in patients with a concomitant PsA (p= 0.41), while bio-naive status was a predictor of better drug survival (p <0.001) compared to patients who had previously failed another biologic.
4. Discussion
Given the chronic nature of plaque psoriasis, the treatment persistence of a biological treatment is becoming more and more important in terms of both patients’ quality of life and pharmacoeconomic. The drug survival of treatment represents a marker of both satisfying disease control and good tolerability. As the therapeutic landscape in plaque psoriasis continues to evolve, several drugs have become available to patients. This has allowed for a rapid switch between biologics, making it crucial to understand the treatment persistence of each drug. Our real-world experience, which included one of the largest populations to date, provides more knowledge on the probability of drug survival of different biological treatments for plaque psoriasis, including the most recently approved drugs (tildrakizumab and risankizumab), which were significantly under-represented in previously studies (7–9). In our study, we found higher overall rates of drug survival after four years for IL-23 inhibitors, confirming data from both clinical trials and real-life experiences on the efficacy and safety of this therapeutic class (7–9). In particular, risankizumab was the drug with the highest drug survival overall throughout the study period ( Figure 1 ). When evaluating only discontinuation due to ineffectiveness, once again risankizumab emerged as the treatment with the highest drug survival, this time followed by ixekizumab. These findings are consistent with data from recent network meta-analyses that highlighted the high effectiveness profile of ixekizumab and risankizumab (12). In particular, risankizumab has shown high efficacy in clinical trials, with rates of PASI 90 at week 16 of 75.3% and 74.8% in the phase-3 studies UltIMMa 1 and UltIMMa 2, respectively (13). Other clinical trials confirmed the long-term efficacy of risankizumab, as PASI 90 was reached by 86.6% of patients at week 52 in the IMMerge study (14) and by 85.5% of patients in the open-label LIMMitless study after more than 3 years (15). Our findings align with the results of a recent study by Torres et al. (8), which described a higher probability of drug survival for anti-IL-23 treatments, despite a limited follow-up for patients receiving tildrakizumab and risankizumab. In particular, the authors found a cumulative probability of survival at 18 months of 96.4% for risankizumab. The baseline characteristics of our population, also categorized by biological drugs, are comparable with those of other real-world experiences (7–9). As expected in real-world retrospective studies, patients’ populations were not homogeneous among all treatment courses in terms of comorbidities and previous exposure to biological treatments. In our study, consistent with other experiences (7), previous exposure to at least one biological drug had a significant impact on drug discontinuation. On the other hand, the concomitant diagnosis of PsA did not play a significant role in our study.
Nevertheless, our study has a few limitations, which are primarily due to its retrospective nature. Moreover, the different biological treatments were approved in different years, resulting in longer follow-up periods for drugs like ustekinumab and secukinumab and shorter ones for IL-23 inhibitors (in particular, risankizumab and tildrakizumab). In addition, the recent availability of different drugs may have resulted in a higher tendency towards therapeutical switches after a shorter period of treatment in the last couple of years. Being this a retrospective real-world study, different comorbidities were not equally represented among different treatment groups, which could interfere with our results. Also, different ethnicities were not significantly represented in our study, which could limit the generalization of our findings. Further studies should be conducted in the next years to evaluate the treatment persistence of bimekizumab, which was not included in this analysis due to its very recent approval (16).
In conclusion, our experience on more than 5900 treatment courses showed that IL-23 inhibitors, and risankizumab in particular, had a higher probability of drug survival overall during a 4-year follow-up. Risankizumab and ixekizumab were less likely to be discontinued because of ineffectiveness after four years of treatment. Secukinumab and ustekinumab emerged as the drugs with the lowest drug survival overall.
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics statement
For this retrospective study, institutional review board approval was waived as the study protocol did not deviate from routine clinical practice. In this study, we did not perform any procedure differently from routine clinical practice. All patients included in the study had provided written consent for retrospective analysis of anonymous data collected during routine clinical practice, including demographics and clinical severity scores. This study was conducted in accordance with the Helsinki Declaration of 1964 and its later amendments.
Author contributions
LG: Conceptualization, Data curation, Formal analysis, Investigation, Visualization, Writing – review & editing. LI: Conceptualization, Data curation, Formal analysis, Investigation, Visualization, Writing – original draft. PM: Conceptualization, Data curation, Methodology, Supervision, Writing – review & editing. AB: Conceptualization, Data curation, Writing – review & editing. FB: Conceptualization, Data curation, Validation, Writing – review & editing. MB: Conceptualization, Data curation, Writing – review & editing. CC: Conceptualization, Data curation, Writing – review & editing. GD: Data curation, Formal analysis, Validation, Writing – review & editing. PD: Conceptualization, Data curation, Writing – review & editing. VD: Data curation, Formal analysis, Writing – review & editing. FG: Data curation, Formal analysis, Writing – review & editing. GG: Conceptualization, Data curation, Methodology, Writing – review & editing. CG: Conceptualization, Data curation, Writing – review & editing. CL: Conceptualization, Data curation, Writing – review & editing. FL: Conceptualization, Data curation, Writing – review & editing. AM: Conceptualization, Data curation, Writing – review & editing. MM: Conceptualization, Data curation, Writing – review & editing. SM: Data curation, Formal analysis, Writing – review & editing. MT: Conceptualization, Data curation, Writing – review & editing. AC: Conceptualization, Data curation, Methodology, Supervision, Validation, Writing – review & editing. AN: Conceptualization, Data curation, Investigation, Methodology, Supervision, Validation, Writing – review & editing.
Acknowledgments
This work was partially supported by “Ricerca Corrente” funding from Italian Ministry of Health to IRCCS Humanitas Research Hospital.
Funding Statement
The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.
Conflict of interest
LG has been a consultant for Almirall. LI has been a consultant for Almirall. PM has been a speaker for AbbVie, Lilly, Novartis, Janssen-Cilag, Celgene, Leopharma and Almirall. AB has received honoraria for participation in advisory boards, meetings or as speaker for AbbVie, Celgene, Janssen-Cilag, Eli Lilly, Novartis Pharma, Pfizer, Sanofi-Genzyme and UCB Pharma. FB has been a consultant advisor and clinical study investigator for Eli Lilly, Abbvie, Novartis, Leo Pharma, Sandoz, Bristol Myers, Abiogen-Pharma, Celgene and Janssen. MB has acted as a speaker and consultant for AbbVie, Janssen, Amgen, Novartis, Eli Lilly and UCB Pharma. CC has served as a board participant or speaker for Abbvie, Lilly, Janssen, Novartis, Celgene, Almirall and Leopharma. GD served as consultant and/or speaker for AbbVie, Almirall, Bristol-Meyers Squibb, LeoPharma, Novartis, Pfizer, Sanofi and UCB and received unrestricted grants from Pfizer and Almirall. PD has been a speaker for Novartis, Abbvie, Sanofi, UCB, Janssen, Lilly and LeoPharma. FG acted as a speaker or consultant for Novartis, Abbvie, Eli Lilly, Celgene, LeoPharma and Almirall. GG served as consultant and/or speaker for AbbVie, Almirall, Amgen, Biogen, Boehringer-Ingelheim, Bristol-Meyers Squibb, Eli-Lilly, LeoPharma, Novartis, Pfizer, Samsung, Sanofi and UCB. CG has been a scientific consultant/speaker/clinical study investigator for Abbvie, Celgene, Janssen, Eli Lilly, Novartis, Pfizer, Sanofi, Almirall and LEO Pharma. CL declares a conflict of interest with Abbvie, Novartis, Lilly and Almirall. FL served on advisory boards and/or received honoraria for lectures from Abbvie, Janssen-Cilag, Novartis, Lilly and Sanofi. AM reports consultancy/advisory boards disease-relevant honoraria from AbbVie, Boehringer-Ingelheim, Novartis, Pfizer, Sanofi and UCB. MM acted as a speaker or consultant for Abbvie, Eli Lilly, Janssen, Leo-Pharma, UCB and Novartis. AC has served as an advisory board member, consultant and has received fees and speaker’s honoraria or has participated in clinical trials for Abbvie, Almirall, Biogen, LEO Pharma, Lilly, Janssen, Novartis, Pfizer, Sanofi Genzyme and UCB-Pharma. AN has served on advisory boards, received honoraria for lectures and research grants from Almirall, Abbvie, Leo Pharma, Celgene, Eli Lilly, Janssen, Novartis, Sanofi-Genzyme, Amgen and Boehringer Ingelheim.
The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.