Importance of optimizing duration of adjuvant immune checkpoint inhibitor therapy to treat postoperative hepatocellular carcinoma after conversion therapy: a case report.

Patients with hepatocellular carcinoma at high risk of recurrence after hepatic resection or local ablation often undergo adjuvant immunotherapy with immune checkpoint inhibitors for 1 year in randomized controlled trials, but the appropriateness of this duration is controversial, especially given the risk of adverse events. Here we report the case of a 52-year-old Chinese man with initially unresectable multinodular recurrent hepatocellular carcinoma who underwent two cycles of transarterial chemoembolization, followed by hepatic resection and 24 months of adjuvant therapy with the PD-1 inhibitor tislelizumab. The patient achieved a recurrence-free survival time of 24 months, but he experienced elevated alpha fetoprotein, Grade 2 hypothyroidism and pruritus while on adjuvant therapy. This case highlights the need to optimize the duration of adjuvant immunotherapy after curative treatment for hepatocellular carcinoma in order to minimize risk of not only recurrence but also adverse events.