A prospective study exploring the safety and efficacy of lenvatinib for patients with advanced hepatocellular carcinoma potential in current real-world practice.

512 Background: Lenvatinib has been widely used as a leading oral multikinase inhibitor for advanced hepatocellular carcinoma (HCC) patients in real-world practice worldwide. However, in the global phase 3 study comparing the effectiveness of lenvatinib and sorafenib, only a limited population of patients were enrolled, excluding those who had a high-burden intrahepatic lesion or Child-Pugh class (C-P) B, who were likely to receive systemic therapy in the clinical practice. Currently, combination immunotherapy has replaced multikinase inhibitors as the standard first-line treatment. Therefore, this prospective study explored the safety and efficacy of lenvatinib in the patient population, which would be used in real-world practice. Methods: This was an open-label, multicenter, prospective study that enrolled patients who had advanced HCC with C-P A or B, treated with lenvatinib as first-line or second-line after atezolizumab plus bevacizumab (Atz + Bv) at 10 sites in Japan. The study included patients who had high tumor burden, defined as identifying either tumor volume of more than 50% of the liver, portal vein tumor thrombosis reaching the main trunk or the contralateral branch, or bile duct invasion at baseline (jRCTs031190017). Results: Between December 1, 2019, and September 30, 2021, 59 patients were recruited for this study. At the time of enrollment, 47 and 12 patients were classified as C-P A and B, respectively. This study included 11 patients with high tumor burden and 12 treated with second-line after Atz + Bv. All patients with high tumor burden and second-line treatment were classified as C-P A. Median overall survival of C-P A and B patients was 20.3 and 4.2 months, respectively. Similarly, progression-free survival according to modified RECIST (mRECIST) of C-P A and B patients was 4.8 and 2.8 months, respectively. Objective response rate (ORR) according to mRECIST in C-P A patients was 61.9%, whereas in C-P B patients was 25.0%. ORRs of high-burden group and second-line group were 80.0% and 40.0%, respectively. Major severe adverse events (AE) (≥grade 3) in C-P A patients were hypertension (41.3%) and proteinuria (23.9%). In contrast, those in C-P B patients were hyponatremia (41.7%), elevated aspartate aminotransferase (41.7%), hypertension (33.3%), decreased appetite (16.7%), diarrhea (16.7%), and proteinuria (16.7%). Discontinuation rate due to AE of C-P A and B patients was 17.4% and 33.3%, respectively. In high-burden and second-line groups, 10% and 20% discontinued lenvatinib due to AE, respectively. Conclusions: Lenvatinib is expected to be safe and effective in patients with advanced HCC who have a high tumor burden and second-line treatment after Atz + Bv, whereas liver function was maintained with C-P A. However, in C-P B, this study found lower efficacy and higher discontinuation rates due to AE compared with C-P A. Clinical trial information: s031190017 .