Abstract
BACKGROUND: Atezolizumab plus bevacizumab is the standard first-line therapy for unresectable hepatocellular carcinoma (uHCC). Immune-related liver injury (IrLI) is common; however, the association between IrLI severity and patient outcomes remains unknown. This study aimed to investigate the prognostic value of irLI in such patients. METHODS: One hundred and sixteen patients who fulfilled the IMBrave150 inclusion criteria were enrolled. IrLI was defined as an increase in serum ALT and/or AST levels attributed to treatment and was graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events v5.0. RESULTS: A total of 61 patients (52.6%) developed any grade of irLI, with a median onset time of 1.7 months. Multivariate analysis revealed that grade II ALBI (hazard ratio [HR] = 2.003, p = 0.028) and BCLC stage C (HR = 3.876, p = 0.016) were associated with worse OS and PFS (HR = 1.327, p = 0.044 and HR = 1.790, p = 0.039, respectively), whereas grade 2 irLI was associated with better OS (HR = 0.223, p = 0.046) and PFS (HR = 0.244, p = 0.011). Patients with grade 2 irLI showed better median OS (not reached) than those without irLI (16.7 months), those with grade 1 (17.5 months), and those with grade ≥ 3 (7.3 months) (overall log-rank p = 0.037). Furthermore, patients with grade 2 irLI demonstrated significantly enhanced PFS (not reached) compared to those without irLI (5.7 months), grade 1 (4.6 months), or grade ≥ 3 (2.3 months), with an overall log-rank p = 0.010. In addition, patients with grade 2 irLI had the highest disease control rate (overall p = 0.053). CONCLUSION: In patients with uHCC treated with Ate/Bev, moderate elevation of liver enzymes (grade 2 irLI) was associated with significantly improved survival and tumor control.