A Phase 3 Study Comparing Pirtobrutinib LOXO-305 and Ibrutinib in Adults With Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma, Including Those With 17p Deletions

What this Trial Is About

Researchers are evaluating the effectiveness and safety of pirtobrutinib LOXO-305 compared to ibrutinib in participants with chronic lymphocytic leukemia CLL or small lymphocytic lymphoma SLL. The study includes participants who may or may not have received prior treatment for their cancer. Part 1 of the trial lasts up to six years, while Part 2 focuses on treatment-nafve participants with a specific genetic deletion 17p deletion and lasts up to two years. Participants will receive pirtobrutinib or ibrutinib orally, depending on their assigned study group. Part 1 compares pirtobrutinib to ibrutinib in a randomized, open-label design. Part 2 evaluates pirtobrutinib alone in participants with the 17p deletion who have not yet been treated. Treatment continues until disease progression, unacceptable side effects, or other study-defined reasons. During the study, participants undergo regular assessments including clinical evaluations and monitoring of their response to treatment using established criteria. Researchers measure overall response rates, progression-free survival, event-free survival, duration of response, overall survival, time to next treatment, symptom worsening, and treatment tolerability. Participation involves ongoing monitoring for up to six years in Part 1 and two years in Part 2 to evaluate long-term outcomes and safety.

A Study of Pirtobrutinib (LOXO-305) Versus Ibrutinib in Participants With Chronic Lymphocytic Leukemia (CLL)/Small Lymphocytic Lymphoma (SLL)