Eli Lilly and Company has announced results from the Phase 3 BRUIN CLL-314 clinical trial evaluating Jaypirca (pirtobrutinib), a non-covalent Bruton tyrosine kinase (BTK) inhibitor, compared to Imbruvica (ibrutinib), a covalent BTK inhibitor, in patients with chronic lymphocytic leukemia or small lymphocytic lymphoma (CLL/SLL) who were either treatment-naïve or BTK inhibitor-naïve. Pirtobrutinib met its primary endpoint of non-inferiority for overall response rate $(ORR)$ compared to ibrutinib, with an ORR of 87.0% versus 78.5% in the intent-to-treat population. Progression-free survival data were described as immature but showed a trend favoring pirtobrutinib, including a 76% reduction in the risk of disease progression or death in the treatment-naïve subgroup. These findings will be presented at the 67th American Society of Hematology $(ASH)$ Annual Meeting and Exposition and published in the Journal of Clinical Oncology.
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