The efficacy of sequential radiotherapy after the combination of TACE with lenvatinib and anti-PD-1 antibodies for unresectable HCC.

[BACKGROUND] Triple therapy of transcatheter arterial chemoembolization (TACE) combined with lenvatinib and anti-PD-1 antibodies has demonstrated excellent efficacy in unresectable hepatocellular carcinoma (uHCC). However, tumor drug resistance is still a major problem and the rate of complete response in uHCC following triple therapy is relatively low. This study aimed to investigate the efficacy and safety of sequential radiotherapy after triple therapy in patients with uHCC to improve tumor response rate.

[METHODS] This retrospective study included 29 patients with uHCC who received sequential radiotherapy after achieving partial response (PR) or stable disease (SD) in tumor response per the modified Response Evaluation Criteria in Solid Tumors (mRECIST) after triple therapy. The overall survival (OS), progression-free survival (PFS), and objective response rate (ORR) were analyzed to evaluate the efficacy of this regimen. Treatment-related adverse events were assessed to determine the safety profile.

[RESULTS] Among the 29 patients, the median OS had not yet been reached, and the median PFS was 19.43 months. The 24-month OS and PFS rates were 72.8% and 46.5%, respectively. The lesions of 6 patients initially with tumor response of PR achieved complete response, and the lesions of 12 patients with SD achieved PR after sequential radiotherapy. All adverse events were manageable, and no treatment-related death occurred.

[CONCLUSION] Sequential radiotherapy after triple therapy enhanced tumor response and survival benefits for uHCC patients, with manageable adverse effects.