JCO at 2025 ASH: Pirtobrutinib in Untreated CLL

JCO Editor-in-Chief Dr. Jonathan Friedberg is joined by colleagues Dr. Jennifer Woyach, Dr. Wojciech Jurczak, and Dr. Matthew Davids to discuss simultaneous publications presented at ASH 2025 on pertibrutinib, a new upfront treatment option for patients with chronic lymphocytic leukemia.

TRANSCRIPT

The disclosures for guests on this podcast can be found in the show notes.

Dr. Jonathan Friedberg: I'm Jonathan Friedberg, editor of Journal of Clinical Oncology, and welcome to JCO After Hours, where we are covering two manuscripts that were presented at the American Society of Hematology meeting 2025 in Orlando, Florida. I am delighted to be joined by colleagues on this call to discuss these pivotal manuscripts which cover the topic of pirtobrutinib, a new upfront treatment option for patients with chronic lymphocytic leukemia.

I will first just introduce our guests, Dr. Woyach.

Dr. Jennifer Woyach: Hi, my name is Jennifer Woyach. I am from the Ohio State University.

Dr. Wojciech Jurczak: Hello, I am Wojciech Jurczak, working at the National Research Institute of Oncology in Krakow, Poland.

Dr. Matthew Davids: Hi, I am Matthew Davids from Dana-Farber Cancer Institute in Boston.

Dr. Jonathan Friedberg: We are going to start by just learning a little bit about these two trials that were both large, randomized phase 3 studies that I think answered some definitive questions. We will start with your study, Jennifer. If you could just describe the design of your study and the patient population.

Dr. Jennifer Woyach: Absolutely. So this is the BRUIN CLL-314 study, and this is a phase 3 randomized trial of pirtobrutinib versus ibrutinib in patients with CLL or SLL who had not previously been treated with a covalent BTK inhibitor. The patients were both treatment-naive and relapsed/refractory, about one-third of the patients treatment-naive, the rest relapsed/refractory, and they were stratified based upon 17p deletion and the number of prior lines of therapy.

The primary objective was looking at non-inferiority of overall response rate over the entire treated population as well as the relapsed/refractory patient population. Key secondary objectives included progression-free survival in the intention-to-treat and the smaller relapsed/refractory and treatment-naive populations.

Dr. Jonathan Friedberg: And just comment a little bit on the risk of the patients.

Dr. Jennifer Woyach: This study was fairly typical of this cohort of patients. Within the relapsed/refractory patient population, there was a median of one prior line of therapy in each of the groups, up to nine prior lines of therapy in the patients included on the study. For the overall cohort, about two-thirds of the patients were IGHV unmutated, about 15% had 17p deletion, 30% had TP53 mutations, and about 35% to 40% had a complex karyotype, which is three or more abnormalities.

Dr. Jonathan Friedberg: And what were your findings?

Dr. Jennifer Woyach: Regarding the primary outcome, which is the focus of the publication, we did find that pirtobrutinib was indeed non-inferior and actually superior to ibrutinib for overall response rate throughout the entire patient population and in both the relapsed/refractory and treatment-naive cohorts. PFS is a little bit immature at this time but is trending towards also being significantly better in pirtobrutin