Phase I Clinical Study To Evaluate Pharmacokinetic Profile, Safety, Efficacy and Immunogenicity Of Ipilimumab Biosimilar HLX13 Vs. YERVOY® (US-Sourced YERVOY®) As A First-Line Treatment For Patients With Unresectable Hepatocellular Carcinoma

Patients will receive HLX13 (3 mg/kg) treatment on the first day of each 3-week cycle, up to 4 cycles.

Patients will receive US-sourced YERVOY® (3 mg/kg) treatment on the first day of each 3-week cycle, up to 4 cycles.

Patients will receive EU-sourced OPDIVO® (EU-sourced nivolumab) (1 mg/kg) treatment on the first day of each 3-week cycle, up to 4 cycles. Subjects who may continue to benefit from OPDIVO® treatment as assessed by investigators will be subsequently treated with local-sourced OPDIVO® monotherapy every 4 weeks, up to 2 year after randomization.