CONTRADICTING EVIDENCE: Median progression-free survival (PFS), 3-month PFS, 6-month PFS, and the disease control rate (DCR) on ICI therapy were compared between B-catenin mutation (BCM) and B-catenin wild-type (BCWT) groups….For best response, 33% of patients with BCM HCC achieved stable disease compared to 67% of patients with BCWT HCC. No patients in our cohort achieved partial or complete response. The DCR for BCM HCC was 33% and the DCR for BCWT HCC was 67%.