A Phase Ib/Il, Open-Label, Multicenter, Randomized Platform Study Evaluating the Efficacy and Safety of Neoadjuvant Immunotherapy Combinations in Patients with Surgically Resectable Hepatoceullular Carcinoma (Morpheus-NEO HCC)

Stage 1

• Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 within 7 days prior to randomization
• Locally advanced or metastatic and/or unresectable hepatocellular carcinoma (HCC) with diagnosis confirmed by histology/cytology or clinically by American Association for the Study of
• Liver Diseases criteria in cirrhotic patients
• Child-Pugh class A within 7 days prior to randomization
• Disease that is not amenable to curative surgical and/or locoregional therapies
• No prior systemic treatment for HCC
• Life expectancy >= 3 months
• Availability of a representative tumor specimen that is suitable for determination of PD-L1 and/or additional biomarker status via central testing

Stage 1 and Stage 2

• Measurable disease according to Response Evaluation Criteria in Solid Tumors v1.1
• Adequate hematologic and end-organ function within 7 days prior to initiation of study treatment
• Documented virology status of hepatitis, as confirmed by screening tests for hepatitis B virus - (HBV) and hepatitis C virus (HCV)
• Negative HIV test at screening
• For women of childbearing potential: agreement to remain abstinent or use contraception and for men: agreement to remain abstinent or use contraception, and agreement to refrain from donating sperm

Stage 2

• ECOG Performance Status of 0, 1, or 2
• Ability to initiate Stage 2 treatment within 3 months after experiencing unacceptable toxicity not related to atezolizumab or RO7247669 or loss of clinical benefit as determined by the investigator while receiving Stage 1 treatment
• Availability of a tumor specimen from a biopsy performed upon discontinuation of Stage 1 (if deemed clinically feasible)

Stage 1

• Prior treatment with CD137 agonists or immune checkpoint inhibitors
• Treatment with investigational therapy within 28 days prior to initiation of study
• Treatment with locoregional therapy to liver within 28 days prior to initiation of study, or non-recovery from side effects of any such procedure
• Untreated or incompletely treated esophageal and/or gastric varices with bleeding or at high risk for bleeding
• Prior bleeding event due to esophageal and/or gastric varices within 6 months prior to initiation of study
• AEs from prior anti-cancer therapy that have not resolved to Grade <= 1 or better, with the exception of alopecia of any grade
• Inadequately controlled hypertension
• History of hypertensive crisis or hypertensive encephalopathy
• Significant vascular disease
• History of hemoptysis within 1 month prior to initiation of study
• Evidence of bleeding diathesis or significant coagulopathy
• Current or recent use of asprin (>325 mg/day) or treatment with clopidogrel, dipyramidole, ticlopidine, or cilostazol
• Current or recent use of full-dose oral or parenteral anticoagulants or thrombolytic agents for therapeutic (as opposed to prophylactic) purpose
• Core biopsy or other minor surgical procedure within 3 days prior to initiation of study
• History of abdominal or tracheoesophageal fistula, GI perforation, or intra-abdominal abscess, intestinal obstruction and/or clinical signs/symptoms of GI obstruction
• Evidence of abdominal free air not explained by paracentesis or recent surgery
• Serious, non-healing/dehiscing wound, active ulcer, or untreated bone fracture
• Grade >=2 proteinuria
• Metastatic disease involving major airways/blood vessels, or centrally located mediastinal tumor masses of large volume
• History of intra-abdominal inflammatory process
• Radiotherapy within 28 days or abdominal/pelvic radiotherapy within 60 days prior to initiation of study with the exception of palliative radiotherapy to bone lesions within 7 days prior to initiation of study
• Major surgery, open biopsy, or significant traumatic injury within 28 days prior to initiation of study; or abdominal surgery, abdominal interventions or significant abdominal traumatic injury within 60 days prior to initiation of study; or anticipation of need for major surgery during study or non-recovery from side effects of any such procedure
• Chronic daily treatment with NSAID
• Eligible only for control arm

Stage 1 and 2

• Fibrolamellar or sarcomatoid HCC, or mixed cholangiocarcinoma and HCC
• History of hepatic encephalopathy
• Moderate or severe ascites
• HBV and HCV coinfection
• Symptomatic, untreated, or actively progressing CNS metastases
• History of leptomeningeal disease
• Uncontrolled tumor-related pain
• Uncontrolled pleural effusion, pericardial effusion, or ascites requiring recurrent drainage procedures
• Uncontrolled or symptomatic hypercalcemia
• Active or history of autoimmune disease or immune deficiency
• History of IPF, organizing pneumonia, drug-induced or idiopathic pneumonitis, or evidence of active pneumonitis on screening chest CT scan
• Active TB
• Significant CV disease within 3 months prior to initiation of study, unstable arrhythmia, or unstable angina
• Major surgery, other than for diagnosis, within 4 weeks prior to initiation of study, or anticipated major surgery during study
• History of malignancy other than HCC within 5 years prior to screening
• Severe infection within 4 weeks prior to initiation of study
• Treatment with therapeutic oral or IV antibiotics within 2 weeks prior to initiation of study
• Prior allogeneic stem cell or solid organ transplantation
• Treatment with a live, attenuated vaccine within 4 weeks prior to initiation of study, or anticipation of need for such a vaccine during atezolizumab treatment or within 5 months after the final dose of atezolizumab
• History of severe allergic anaphylactic reactions to chimeric or humanized antibodies or fusion proteins
• Known allergy or hypersensitivity to any of the study drugs or any of their excipients Treatment with systemic immunostimulatory, immunosuppressive agents within 4 weeks or 5 drug-elimination half-lives (whichever is longer) prior to initiation of study
• Treatment with systemic immunosuppressive medication within 2 weeks prior to initiation of study
• Patients entering Stage 2: immunotherapy-related adverse events that have not resolved to Grade 1 or better or to baseline at time of consent