Pirtobrutinib Maintains Efficacy and Decreases BTK C481 Clones Despite Acquired Resistance Mutations in CLL
Patients with chronic lymphoctyic leukemia treated with pirtobrutinib monotherapy experienced comparable objective response rates regardless of acquired BTK mutation and a decrease or clearance of BTK cysteine 481 clones despite the emergence of non-C481 clones or other less common mutations during or near the time of progression.