Efficacy and safety in unresectable hepatocellular carcinoma using atezolizumab plus bevacizumab in later-line: A retrospective analysis of real-world evidence.

e16173 Background: As far, no data has been published about later-line application of atezolizumab plus bevacizumab (T+A) in patients with unresectable hepatocellular carcinoma (uHCC). Methods: We retrospectively recruited uHCC patients who treated with later-line T+A. Efficacy endpoints included overall survival (OS) and progression free survival (PFS), in accordance with RECIST v1.1. Safety was evaluated with CTCAE v5.0. We also continually enrolled uHCC patients who received later-line regorafenib plus PD-1 inhibitors (Reg+PD-1) as a comparison. Results: Total 33 patients were continually included, 12 used T+A and 21 chose Reg+PD-1. Baseline performance status, liver function and BCLC tumor stage were similar between two cohorts. At data cut-off at February 2023, following median following-up at 18.9 months, median OS in cohort T+A and Reg+PD-1 were 8.2 (95%CI: 5.8-10.6) vs 15.6 (95%CI: 7.6-23.6) (p = 0.237). Median PFS in cohort T+A and Reg+PD-1were 5.1 (95%CI: 1.1-9.1) vs 3.5 (95%CI: 2.1-4.9) (p = 0.575). OS rate and PFS rate are listed. None of efficacy endpoints reached statistical difference. All patients suffered from AEs. No AEs-related death occurred. Conclusions: Efficacy and safety of later-line T+A in uHCC patients was similar with those who used regorafenib plus PD-1 inhibitors, which needed to be further confirmed. [Table: see text]