Real-World Effectiveness of Frontline Treatments Among Patients with Chronic Lymphocytic Leukemia: Results from ConcertAI

<b>Background:</b> The long-term follow-up of clinical trials of novel first-line (1L) therapies for chronic lymphocytic leukemia (CLL) demonstrates 6-10-year progression-free survival. We describe the effectiveness of 1L CLL treatments in real-world settings, with an emphasis on the important real-world outcome of time to next treatment or death (TTNT-D). <b>Methods:</b> This retrospective, observational study utilized de-identified electronic health records from the ConcertAI RWD360™ database with linked administrative open claims. Adults with CLL who initiated an approved 1L CLL therapy (June 2019-March 2023) were included. Duration of therapy (DoT), TTNT-D, and overall survival were assessed. <b>Results:</b> At 1L, 39.8% of 1843 patients received first-generation covalent Bruton tyrosine kinase inhibitors (cBTKis), 23.0% second-generation cBTKis, 12.4% venetoclax-obinutuzumab (VenO), 7.4% chemotherapy/chemoimmunotherapy (CT/CIT), and 17.4% anti-CD20 monotherapy. Median (range) follow-up in months was 24.9 (13.1-36.6) for first-generation cBTKis, 13.4 (7.3-21.7) for second-generation cBTKis, 16.0 (8.4-27.8) for VenO, 21.8 (11.2-32.7) for CT/CIT, and 19.7 (10.0-33.4) for anti-CD20 monotherapy. Median (range) DoT was 11.5 (4.2-25.0) and 8.6 (3.0-16.1), 9.1 (5.9-12.2), 5.6 (3.2-5.8), and 1.6 (1.6-4.5) months for first- and second-generation cBTKis, VenO, CT/CIT, and anti-CD20 monotherapy, respectively. Regarding TTNT-D, at 2 years' follow-up, 69.1%, 82.5%, 86.3%, 79.1%, and 53.0% of patients treated with first- and second-generation cBTKis, VenO, CT/CIT, and anti-CD20 monotherapy, respectively, had not initiated subsequent treatment or experienced death. <b>Conclusions:</b> TTNT-D is an important real-world outcome in CLL. Our findings demonstrated the utility of time-limited VenO, with potentially more time off treatment, relative to continuous 1L cBTKi therapies.