Rigel Finalizes the Study Design of its Ongoing Phase 3 Clinical Trial of Fostamatinib in Warm Autoimmune Hemolytic Anemia

FDA agrees to the proposed primary efficacy endpoint and additional secondary endpoints

SOUTH SAN FRANCISCO, Calif., Nov. 17, 2020 /PRNewswire/ — Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL) today announced that it has reached agreement with the U.S. Food and Drug Administration (FDA) on the final design of its FORWARD study, a pivotal Phase 3 clinical trial of fostamatinib disodium hexahydrate (fostamatinib) in warm autoimmune hemolytic anemia (AIHA). The FDA agreed to Rigel’s proposed durable response measure for the primary efficacy endpoint as well as the inclusion of additional secondary endpoints.  

The Phase 3 clinical trial is a randomized, double-blind, placebo-controlled study of approximately 90 patients with primary or secondary warm AIHA who have failed at least one prior treatment. The primary efficacy endpoint for the trial is a durable response defined as a hemoglobin level ≥ 10 g/dl with an increase from baseline of ≥ 2 g/dl on three consecutive

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