A Study of Tislelizumab Versus Sorafenib in Participants With Unresectable Hepatocellular Carcinoma (HCC)

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• Safety Run-In Sub-study Eligibility Criteria: The study included adult Japanese participants (≥ 20 years) with histologically confirmed hepatocellular carcinoma (HCC) at Barcelona Clinic Liver Cancer (BCLC) Stage C or B. Eligible participants had either received, were ineligible for, or declined standard treatment. Additional requirements were a Child-Pugh A classification within 7 days before enrollment, at least one measurable lesion per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1, and an Eastern Cooperative Oncology Group (ECOG) Performance Status score of ≤ 1.
• Main Study Key Inclusion Criteria:
• Histologically confirmed diagnosis of HCC
• Barcelona Clinic Liver Cancer (BCLC) Stage B or C disease not amenable to or progressing after loco-regional therapy and not amenable to a curative treatment approach
• No prior systemic therapy for HCC (with the exception of HCC participants enrolled in the safety run-in substudy \[Japan only\])
• Measurable disease
• Child-Pugh score A
• Easter Cooperative Oncology Group (ECOG) Performance Status ≤ 1
• Adequate organ function
  • Main Study Key Exclusion Criteria:
• Known fibrolamellar HCC, sarcomatoid HCC, or mixed cholangiocarcinoma and HCC histology
• Tumor thrombus involving main trunk of portal vein or inferior vena cava
• Loco-regional therapy to the liver within 28 days before randomization
• Clinical evidence of portal hypertension with bleeding esophageal or gastric varices at Screening, or within 6 months before randomization
• Bleeding or thrombotic disorder or any prescribed anticoagulant requiring therapeutic international normalized ratio monitoring (eg, warfarin or similar agents) at Screening, or within 6 months before randomization/enrollment
• Presence at Screening of active immune deficiency or autoimmune disease and/or prior history of any immune deficiency or autoimmune disease that may relapse
• Participant with any condition requiring systemic treatment with either corticosteroids (\> 10 mg daily of prednisone or equivalent) or other immunosuppressive medication within 14 days before randomization
• History of interstitial lung disease or non-infectious pneumonitis, unless induced by radiation therapy
• QT interval corrected for heart rate (QTc) (corrected by Fridericia's method) \> 450 msec at Screening
  • NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.