Abstract Background Etrasimod is an oral, once-daily, selective sphingosine 1-phosphate (S1P)1,4,5 receptor modulator for the treatment of moderately to severely active ulcerative colitis (UC). The long-term safety, tolerability and efficacy of etrasimod are being evaluated in an ongoing open-label extension (OLE) study.1 We report an updated cumulative safety analysis from the etrasimod UC clinical programme with a maximum of 4 years of exposure. Methods Patients who received etrasimod in completed phase 2 (OASIS; OASIS OLE), phase 3 (ELEVATE UC 52; ELEVATE UC 12) and ongoing ELEVATE UC OLE (data cutoff 30 Aug 2023) and ES101002 OLE (data snapshot 30 Aug 2022) studies were included. Treatment-emergent adverse event (TEAE) frequency and exposure-adjusted incidence rates (IRs) per 1 patient-year (PY) were analysed. Results A total of 1196 patients received ≥1 dose of etrasimod 1 mg or 2 mg once daily with a mean (standard deviation) exposure of 70.66 (54.36) weeks, and 1619.5 PYs of total exposure. Demographics and baseline characteristics are reported in Table 1. Most TEAEs were nonserious and rarely led to discontinuation. The IRs of TEAEs of interest were generally low (Table 2). Serious infections and herpes zoster infections were infrequently reported (all IR ≤0.02). Three patients experienced four nonserious events of macular oedema (0.3%, IR <0.01), including one event leading to discontinuation that resolved. One patient experienced two nonserious events of cystoid macular oedema (<0.1%; IR <0.01) that resolved. Malignancies were uncommon and included five patients with serious events (0.4%), two patients with squamous cell carcinomas and one with basal cell carcinoma. Eleven patients (0.9%) had alanine aminotransferase (ALT) levels >3 times the upper limit of normal (ULN) at two consecutive post-baseline visits. Notably, no patients exhibited >3× ULN in either ALT or aspartate aminotransferase and >2× ULN in total bilirubin (laboratory criteria for Hy’s law). TEAEs leading to death were reported in three patients (all deemed unrelated to treatment). No serious adverse events of hypertension or bradycardia were reported. No events of second-degree Mobitz type 2 atrioventricular (AV) block or third-degree AV block occurred. Conclusion Etrasimod remains well tolerated in patients with moderately to severely active UC, with a favourable safety profile that has not changed with longer-term treatment exposure for up to 4 years.
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