S0787 An Update on the Analysis of Non-Melanoma Skin Cancer in the Tofacitinib Ulcerative Colitis Clinical Program as of May 2019

Abstract

INTRODUCTION: Tofacitinib is an oral, small molecule JAK inhibitor for the treatment of UC. We present an updated [1] analysis of non-melanoma skin cancer (NMSC) events in the tofacitinib UC clinical program as of May 2019. METHODS: NMSC events were evaluated from 3 randomized, placebo-controlled studies (2 Phase [P]3 induction studies [NCT01465763; NCT01458951] and 1 maintenance P3 study [NCT01458574]) and an ongoing, open-label, long-term extension (OLE) study (NCT01470612). Three cohorts were analyzed: Induction (P3 induction studies), Maintenance (P3 maintenance study), and Overall (patients [pts] receiving tofacitinib 5 or 10 mg twice daily [BID] in P3 or OLE studies). Analysis was by predominant dose (PD) 5 or 10 mg BID, based on average daily dose < 15 mg or ≥ 15 mg, respectively (82.4% of pts assigned PD 10 mg BID). An independent adjudication committee reviewed potential NMSC. Proportions and incidence rates (IRs; unique pts with events per 100 pt-years [PY] of exposure) were evaluated for NMSC. A Cox proportional hazards model was used for risk factor analysis. RESULTS: 1,124 pts were evaluated for NMSC (2,576.4 PY of tofacitinib exposure; ≤ 6.8 years of treatment). NMSC events in the Induction and Maintenance Cohorts were previously reported (Table) [1]. NMSC occurred in 19 Overall Cohort pts (IR 0.73 [95% confidence interval (CI) 0.44, 1.13]; PD tofacitinib 5 mg BID, n = 3, IR 0.45 [0.09, 1.30]; PD tofacitinib 10 mg BID, n = 16, IR 0.82 [0.47, 1.34]) (Table); no new cases since Sep 2018 [1]. No NMSC was metastatic or led to discontinuation. Prior NMSC (hazard ratio [HR] 9.09 [95% CI 2.98, 27.73]), prior tumor necrosis factor inhibitor (TNFi) failure (HR 3.32 [1.08, 10.20]), and age (per 10-year increase, HR 2.03 [1.37, 3.02]) were significant risk factors for NMSC. CONCLUSION: NMSC events were infrequent with tofacitinib treatment and more likely to occur in pts with prior NMSC, prior TNFi failure, and with increasing age – known NMSC risk factors [2]. Dose dependency of NMSC IR could not be concluded here, as dose changes were permitted. NMSC IRs were similar to those previously reported in the tofacitinib UC clinical program [1] and in pts with UC treated with biologics [3].Table 1