Safety of Crovalimab Versus Eculizumab in Patients With Paroxysmal Nocturnal Haemoglobinuria (PNH): Pooled Results From the Phase 3 COMMODORE Studies.

To evaluate the tolerability of crovalimab versus eculizumab in C5 inhibitor (C5i)-naive and -experienced patients with PNH from COMMODORE 2, 3 and 1 (NCT04434092, NCT04654468 and NCT04432584).

Pooled safety data were assessed in the total crovalimab and eculizumab populations and by C5i-naive versus C5i-switched status in patients receiving crovalimab. Analyses include 6.5 months of additional follow-up from the COMMODORE 2 and 1 primary analyses.

COMMODORE safety data (crovalimab, 393 patients [naive, 192 patients; switched, 201 patients]; eculizumab, 111 patients) were analysed. The total patient years (PY) were 503.9 and 51.1 in the total crovalimab and eculizumab populations, respectively, with 471 and 581 adverse events (AEs) per 100 PY. Serious infection rates were 8.9 and 13.7 AEs per 100 PY, respectively; no meningococcal infections were reported. Fatal AEs occurred in eight (2%) patients receiving crovalimab (naive, six patients; switched, two patients) and one (1%) receiving eculizumab, all treatment unrelated. In C5i-switched patients, 39 (19%) had transient immune complex reactions (risk when switching between C5i and crovalimab); the majority were Grades 1-2 arthralgia and rash, and 16 (8%) had Grade 3 events.

Crovalimab's safety profile was consistent with eculizumab's and was generally comparable between C5i-naive and C5i-switched patients.