Article
作者: Yang, Wenlin ; Cao, Lei ; Pei, Xiaoping ; Ji, Chao ; Zhang, Li ; Yao, Weifeng ; Liang, Yunsheng ; Gao, Xinghua ; Zhang, Litao ; Lin, Bingjiang ; Feng, Wenli ; Xu, Aie ; Meng, Zudong ; Li, Linfeng ; Xie, Zhihong ; Jiang, Meiying ; Zhang, Guoqiang ; Bian, Kunpeng ; Feng, Yanyan ; Wang, Mingyue ; He, Yingxia ; Du, Daniel Y ; Wu, Liming ; Chen, Rixin
Background:We conducted a phase IIb clinical trial of pumecitinib 3% gel (PG-011), a novel selective Janus kinase (JAK)1/2 inhibitor, applied topically to treat mild-to-moderate atopic dermatitis (AD).
Objectives:To assess pumecitinib 3% gel for its efficacy and safety in treating adult patients with mild-to-moderate AD, and to determine the optimal treatment regimen.
Methods:In this study, 139 participants with mild-to-moderate AD were randomized 1 : 1 : 1 to pumecitinib 3% gel twice daily (n = 47), pumecitinib 3% gel once daily (n = 46) and placebo (n = 46) for 8 weeks of treatment. Percentage change in Eczema Area and Severity Index (EASI) score from baseline to week 8 was the primary efficacy endpoint. The percentage of participants with an Investigator’s Global Assessment score of 0 or 1 (≥ 2-point improvement from baseline) at week 8, the proportion of participants attaining ≥ 50% improvement in EASI (EASI 50), ≥ 75% improvement in EASI (EASI 75) and ≥ 90% improvement in EASI (EASI 90) at week 8, and improvement in quality of life were also evaluated. Safety, local tolerability and some pharmacokinetics were monitored.
Results:At week 8, the percentage change from baseline in EASI score in the pumecitinib 3% gel twice daily, pumecitinib 3% gel once daily and placebo groups was –83.6%, –44.0% and –22.0%, respectively. Both pumecitinib treatment regimens showed a significantly greater effect compared with placebo (P < 0.006) and the pumecitinib 3% gel twice-daily regimen had a greater effect than once-daily treatment (P < 0.001). Other efficacy endpoints were also improved in participants in the pumecitinib groups vs. those in the placebo group, and pumecitinib 3% gel twice daily consistently exhibited better efficacy than the once-daily treatment. With regard to safety, the rate of adverse events in the pumecitinib and placebo groups was 48% and 48%, respectively. Safety profiles were generally similar between the pumecitinib and placebo groups, and treatment was well tolerated. Mean plasma drug concentrations were low (range 38–104 pg mL–1) over the 8-week treatment period.
Conclusions:Pumecitinib 3% gel showed good efficacy and safety profiles in the treatment of adults with mild-to-moderate AD. The pumecitinib 3% twice-daily treatment regimen showed greater efficacy than the once-daily regimen in treating mild-to-moderate AD. Pumecitinib 3% gel was well tolerated and generated low systemic drug exposure when used topically. It may be a new choice of topical JAK inhibitor to treat mild-to-moderate AD.