PD-1 targeted immunotherapy for advanced hepatocellular carcinoma: current utilization and outcomes in the USA.

Objective: To evaluate the utilization and outcomes of PD-1-directed immunotherapy (PD-1 IMT) for advanced hepatocellular carcinoma. Methods: Patients with advanced hepatocellular carcinoma receiving systemic therapy and PD-1 IMT (nivolumab/pembrolizumab) were included from the Flatiron database. Overall survival (OS) was evaluated using multivariable Cox models with the following subgroup analyses: patients with data on clinical performance and liver function and patients receiving tyrosine kinase inhibitors. Results: n = 1770 patients were included (PD-1 IMT 19.3%). Overall, PD-1 IMT was associated with longer OS (hazard ratio [HR]: 0.57). This effect was robust across both subgroup analyses with HR: 0.72 (subgroup 1) and HR: 0.57 (subgroup 2). Conclusions: PD-1 IMT is increasingly used in clinical practice and associated with an OS benefit.