ABSTRACT
Introduction: Guselkumab (GUS), an IL-23p19 antagonist, had greater efficacy than placebo (PBO) in achieving clinical response and clinical remission atWeek (Wk) 12 in the randomized, controlled Phase 2b QUASAR Induction Study 1 (NCT04033445) in patients with moderately to severely active ulcerative colitis (UC).1 Patients who were not in clinical response at Wk 12 received GUS treatment through Wk 24. Here, we report GUS cumulative efficacy and safety results for Induction Study 1. Method(s): Eligible patients had moderately to severely active UC (modified Mayo score of 5 to 9 with a Mayo endoscopy subscore >=2) at baseline. Patients were randomized 1:1:1 to IV GUS 200mg, 400mg, or PBO at Wks 0, 4, and 8. Patients who were not in clinical response to IV induction at Wk 12 received GUS treatment (PBO IV->GUS 200mg IV;GUS 200mg IV->GUS 200mg SC;GUS 400mg IV->GUS 200mg SC) at Wks 12, 16, and 20 and were evaluated at Wk 24 (Figure). Matching IV or SC PBO was administered to maintain the blind. Result(s): Three hundred thirteen patients were randomized and treated at baseline. Demographic and disease characteristics at baseline were similar among the treatment groups, and approximately 50% had a prior inadequate response or intolerance to advanced UC therapy. AtWk 12, clinical response was achieved by 61.4% (62/101) and 60.7% (65/107) of patients randomized to GUS 200mg and GUS 400mg IV vs 27.6 % (29/105) of patients randomized to PBO IV (both p< 0.001). Of the patients in the GUS groups who were not in clinical response at Wk 12, 54.3% (19/35) in the GUS 200mg IV->200mg SC group and 50.0% (19/38) in the GUS 400mg IV->200mg SC group achieved clinical response at Wk 24. Clinical response atWk 12 or 24 was achieved by 80.2% of patients who were randomized to GUS 200mg IV and 78.5% of patients who were randomized to GUS 400mg IV. For patients who received PBO IV->GUS 200mg IV, clinical response at Wk 24 (65.2%) was similar toWk 12 clinical response following GUS 200mg IV induction (61.4%). The most frequent adverse events among all GUS-treated pts (n=274) were anemia (7.7%), headache (5.1%), worsening UC (4.4%), COVID-19 (3.6%), arthralgia (2.9%) and abdominal pain (2.6%) which are consistent with Wk 12 results. Conclusion(s): Overall, approximately 80% of patients randomized to receive GUS achieved clinical response at Wk 12 or 24. Continued treatment with SC GUS allowed 50-54.3% of IV GUS Wk 12 clinical nonresponders to achieve clinical response at Wk 24. No new safety concerns for GUS were identified. (Figure Presented).
ABSTRACT
Introduction: Etrasimod (APD334), an investigational, once-daily, oral, selective sphingosine 1-phosphate receptor 1,4,5 modulator, demonstrated efficacy in adults with moderately to severely active ulcerative colitis (UC) in the Phase 2 OASIS trial (NCT02447302). Here, we report data from 2 trials, ELEVATE UC 52 and ELEVATE UC 12, that evaluated the efficacy and safety of etrasimod 2mg for induction and maintenance in adults with UC. Aims & Methods: ELEVATE UC 52 (NCT03945188) and ELEVATE UC 12 (NCT03996369) were global, randomized, double-blind, placebo-controlled trials. In both trials, adults (16-80 years) with moderately to severely active UC (based on modified Mayo Score [MMS] of 4-9 with centrally read endoscopic subscore >=2 and rectal bleeding subscore >=1) and documented history of inadequate response, loss of response, or intolerance to >=1 treatment for UC were randomized 2:1 to once-daily treatment with etrasimod 2mg or placebo. Patients (pts) were stratified by previous exposure to biologic/Janus kinase inhibitor (JAKi) therapy, baseline corticosteroid use, and baseline disease activity (MMS 4-6 or 7-9). ELEVATE UC 52 utilized a treat-through design comprising a 12-week induction period followed by a 40-week maintenance period. Beginning at Week (Wk) 12, all pts could continue their randomized treatment;pts whose disease had not improved or had worsened compared to baseline (based on investigator judgement) could discontinue and enroll in an open-label extension study (NCT03950232). ELEVATE UC 12 comprised a 12-week induction period only. The primary efficacy endpoints were the proportion of pts achieving clinical remission (using the MMS) at Wk 12 and Wk 52 in ELEVATE UC 52, and at Wk 12 in ELEVATE UC 12. Safety was evaluated throughout the trials. Result(s): In ELEVATE UC 52, 433 pts were randomized (etrasimod, n=289;placebo, n=144) and 207 completed Wk 52. In ELEVATE UC 12, 354 pts were randomized (etrasimod, n=238;placebo, n=116) and 316 completed Wk 12. 62.6% of etrasimod-treated pts in both trials and 61.8% and 62.9% of placebo-treated pts in ELEVATE UC 52 and ELEVATE UC 12, respectively, were naive to biologic/JAKi therapy. All primary and key secondary efficacy endpoints were achieved with etrasimod vs placebo at both Wks 12 and 52 in ELEVATE UC 52 and Wk 12 in ELEVATE UC 12 (Table). Most commonly reported TEAEs (>=3% of etrasimod-treated pts and greater than placebo in either trial) were headache, nausea, COVID-19 infection, dizziness, pyrexia, arthralgia, abdominal pain and worsening of UC. Serious AEs were similar between treatment groups in both trials. The overall safety profile was consistent with previous studies. Conclusion(s): Treatment with etrasimod 2mg resulted in statistically significant and clinically meaningful improvements based on clinical, endoscopic, symptomatic, and endo-histologic endpoints at Wks 12 and 52 in adults with moderately to severely active UC. No new safety findings were observed with etrasimod 2mg treatment for up to 52 weeks.