Background/aim: Atezolizumab plus bevacizumab (Atez/Bev) treatment is recommended for unresechepatocellular carcinoma (u-HCC) patients classified as Child-Pugh A (CP-A). This study aimed to elucidate the prognosis of patients treated with Atez/Bev, especially CP-A and -B cases.
Materials/methods: From September 2020 to March 2022, 457 u-HCC patients treated with Atez/Bev were enrolled (median age 74 years, male:female = 368:89, CP-A:CP-B = 427:30, Child-Pugh score [CPS] 5:6:7:8:9 = 271:156:21:8:1). Therapeutic response was evaluated using RECIST ver.1.1. Clinical features and prognosis were retrospectively evaluated.
Results: There were no significant differences between CP-A and -B patients in regard to best response (CR:PR:SD:PD = 16:91:194:81 vs. 0:7:13:8, p = 0.739; objective response rate/disease control rate = 28.0%/78.8% vs. 25.0%/71.4%). Analysis performed using inverse probability weighting adjustments of clinical factors other than those related to hepatic reserve function with a p value < 0.10 for comparisons between patients with CP-A and -B showed that the progression-free survival (PFS) rate for CP-A cases was better (6-/12-/18-month: 58.2%/36.1%/27.8% vs. 49.6%/8.7%/non-estimable [NE], p < 0.001), as was overall survival (OS) rate (6-/12-/18-month: 89.9%/71.7%/51.4% versus 63.6%/18.4%/NE; p < 0.001). Median PFS (mPFS) and median OS (mOS) for the CPS-5 were 9.5 months/NE, and 5.1/14.0 months for the CPS-6 (both p < 0.001). Furthermore, for modified albumin-bilirubin grade (mALBI)-1/2a/2b, mPFS was 9.4/8.5/5.3 months (p < 0.001) and mOS was NE/17.8/13.4 months (p < 0.001).
Conclusion: Better hepatic function, such as mALBI grade 1 or 2a are thought to indicate a better condition for obtaining sufficient prognosis with Atez/Bev treatment for u-HCC patients, whereas for CP-B patients, who mainly shown an mALBI grade of 2b or 3, Atez/Bev might have less therapeutic efficacy.
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