FDA Approval Summary: Tremelimumab in combination with durvalumab for the treatment of patients with unresectable hepatocellular carcinoma.

On October 21, 2022, the FDA approved tremelimumab (Imjudo) in combination with durvalumab for adult patients with unresectable hepatocellular carcinoma (uHC). The approval was based on the results from the HIMALAYA study, in which patients with uHC who were naïve to previous systemic treatment were randomized to receive one of three study arms: tremelimumab in combination with durvalumab (n=393), durvalumab (n=389), or sorafenib (n=389). The primary objective of improvement in overall survival (OS) for tremelimumab in combination with durvalumab compared to sorafenib met statistical significance with a stratified hazard ratio (HR) of 0.78 (95% confidence interval [CI], 0.66, 0.92; P=0.0035). The median OS was 16.4 months (95% CI, 14.2 to 19.6) with tremelimumab in combination with durvalumab and 13.8 months (95% CI, 12.3 to 16.1) with sorafenib. Adverse reactions occurring in ≥20% of patients receiving tremelimumab in combination with durvalumab were rash, fatigue, diarrhea, pruritus, musculoskeletal pain, and abdominal pain. The recommended tremelimumab dose for patients weighing 30 kg or more is 300 mg intravenous (IV) as a single dose in combination with durvalumab 1500 mg at Cycle 1/Day 1, followed by durvalumab 1500 mg IV every 4 weeks. For those weighing less than 30 kg, the recommended tremelimumab dose is 4 mg/kg IV as a single dose in combination with durvalumab 20 mg/kg IV, followed by durvalumab 20 mg/kg IV every 4 weeks.