A Phase 2/3 Randomized, Multicenter Study of Osivelotor Administered Orally to Adult and Adolescent Participants With Sickle Cell Disease

This is a three-part, multicenter, Phase 2/3 study of orally administered osivelotor in participants with sickle cell disease (SCD). Part A will evaluate the safety, tolerability, and efficacy of osivelotor in adult participants with SCD to determine an optimal dose. Part B will evaluate the efficacy of osivelotor versus placebo in adult and adolescent participants with SCD for 48 weeks. Open Label Extension (OLE) will evaluate the long-term safety and hematologic responses of open-label osivelotor in adult and adolescent participants having completed Part B.