A Phase 3, Multicenter, Randomized, Double-blind, Placebo-controlled, Parallel-group Study With an Open-label Period and Long-term Extension to Assess the Efficacy and Safety of Rilzabrutinib in Participants With Warm Autoimmune Hemolytic Anemia (wAIHA)
This is a parallel-group, Phase 3, double-blind, 2-arm study to investigate the efficacy, safety, PK and PD of oral rilzabrutinib in achieving durable Hb response (DHR) compared with placebo in approximately 90 male and female participants ≥ 18 years of age with a confirmed diagnosis of primary wAIHA. Following a 4-week screening period, eligible participants will be randomized in a 2:1 ratio to receive rilzabrutinib or placebo in primary analysis period (PAP) for a duration of up to 24 weeks. All participants who completed PAP will then continue in open-label period (OLP) to receive rilzabrutinib for a duration of 28 weeks. Upon the completion of OLP, only participants who demonstrate Hb increase during the last 8 weeks of OLP per specified criteria in the protocol will be eligible to continue in long-term extension (LTE) of the study. The duration of the LTE period will be from the first-participant-in (FPI)-LTE until the last participant completes 52 weeks in LTE. The safety follow-up period of this study following treatment completion or discontinuation will be 2 weeks.
• Male and female participants with a documented (confirmed) diagnosis of primary wAIHA for at least 3 months.
• Participants who have previously failed to maintain a sustained response after treatment with CS (CS-resistance \[defined as failure to obtain hemoglobin response within 3 weeks on at least 1 mg/kg or 60 mg prednisone or equivalent per day\], CS-dependent wAIHA \[defined as need to continue on prednisone or equivalent at a dose of \>10 mg/day to maintain a response\]), or are intolerant or ineligible to CS (defined as with contraindications, pre-existing medical conditions or CS-related complications that may render CS intolerant or ineligible per the best clinical judgement of the investigators).
• Participants with Eastern Cooperative Oncology Group (ECOG) performance status Grade 2 or lower.
• Contraceptive use by men and women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies.