Sintilimab and lenvatinib plus hepatic arterial infusion chemotherapy and embolization as conversion therapy for uHCC: A phase 2 trial.

BACKGROUND

Transarterial chemoembolization (TACE) or systemic treatments are recommended for unresectable hepatocellular carcinoma (uHCC) but have low conversion-to-resection rates. This single-arm phase II trial (PLATIC) aims to investigate the conversion efficacy of PD-1 inhibitor sintilimab, lenvatinib plus TACE and hepatic arterial infusion chemotherapy (TACE-HAIC) in uHCC.

METHODS

57 uHCC patients received 200 mg of sintilimab and lenvatinib (8/12 mg for body weight <60 kg or ≥60 kg) and TACE-HAIC every 3-4 weeks. The primary endpoint was conversion-to-resection rate. A historical-based cohort treated with TACE-HAIC was included as control.

FINDINGS: After a median of three treatment cycles, 44 (77.2%; 95% confidence interval [CI], 0.64-0.87]) patients underwent conversion resection. The objective response rates were 80.7% (95% CI, 0.68-0.90) according to modified Response Evaluation Criteria in Solid Tumors (mRECIST) and 43.8% (95% CI, 0.31-0.58) according to RECIST 1.1. Grade ≥ 3 treatment-related adverse events (TRAEs) occurred in 37 (64.9%) patients; no treatment-related deaths were reported. Among the 44 patients receiving resection, the median progression-free survival (PFS) was 17.3 months, and the median overall survival (OS) was unavailable. After inverse probability of treatment weighting analysis, the PLATIC cohort exhibited longer PFS (hazard ratio [HR] = 0.55, 95% CI, 0.33-0.94; p = 0.020) and OS (HR, 0.50, 95% CI, 0.28-0.92; p = 0.029) than the historical cohort.

CONCLUSIONS

Sintilimab, lenvatinib, and TACE-HAIC demonstrated favorable conversion-to-resection rates and acceptable TRAEs in uHCC.

FUNDING: Supported by grants from the National Natural Science Foundation of China (no. 82172815 and 82272887) and Cancer Innovative Research Program of Sun Yat-sen University Cancer Center (no. PT22040201).