A Study to Evaluate Efficacy and Safety of Hepatic Resection for Liver Cancer With PVTT, HVTT or IVCTT After Initial Ate/Bev

Inclusion Criteria: 1. Signed Informed Consent Form (ICF) 2. Aged ≥18 years at time of signing ICF 3. Ability to comply with the study protocol, in the investigator's judgment 4. Documented diagnosis of HCC confirmed by histology/cytology or clinically by AASLD criteria in cirrhotic patients - Patients without cirrhosis require histological confirmation of diagnosis. 5. No prior anti-tumor treatment (including both local-regional and systemic therapies) for HCC * Previous use of herbal therapies/traditional Chinese medicines (TCM) with anti-cancer activity included in the label is allowed, provided that these medications are discontinued at least 7 days prior to enrollment. 6. Presence of PVTT, determined based on the radiological findings, including Vp1 (third-order branch of portal vein) to Vp4 (main trunk/collateral branch of portal vein) according to the Japanese staging system or Presence of HVTT or IVCTT, without atrium tumor thrombosis, determined based on the radiological findings 7. Remnant liver volume-to-total liver volume (RLV%) ≥ 25% 8. At least one measurable lesion (per RECIST v1.1) untreated lesion 9. ECOG performance status of 0 or 1 within 7 days prior to study entry 10. Child-Pugh class A within 7 days prior to study entry 11. Life expectancy ≥12 weeks 12. Adequate hematologic and end-organ function, defined by the following laboratory test results, obtained within 14 days prior to initiation of induction treatment unless otherwise specified: \- Absolute neutrophil count (ANC)≥1.5x109/L (1500/uL) without granulocyte colony stimulating factor support \- Lymphocyte count ≥0.5x109/L (500/uL) \- Platelet count ≥75x109/L (75,000/uL) without transfusion * Hemoglobin ≥90 g/L (9 g/dL). Patients may be transfused to meet this criterion. * Aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP) ≤5x upper limit of normal (ULN) * Serum total bilirubin ≤3x ULN * Serum albumin ≥28 g/L (2.8 g/dL) * Serum creatinine (SCr) ≤1.5 x ULN or Creatinine clearance (CCr) ≥ 50mL/min (calculated using the Cockcroft-Gault formula): (140-age) x Weight (kg) CCr (ml/min) = --------------------------------- (Female x 0.85) 72 x SCr (mg/dL) (140-age) x Weight (kg) OR CCr (ml/min) = ----------------------------------- (Female x 0.85) 0.818 x SCr (umol/L) * For patients not receiving therapeutic anticoagulation: international normalized ratio (INR) or activated partial prothrombin time (aPTT) ≤ 1.2 x ULN * Urine dipstick for proteinuria \< 2+ (within 7 days prior to Day 1 of Cycle 1) Patients discovered to have ≥ 2+ proteinuria on dipstick urinalysis at baseline should undergo a 24-hour urine collection and must demonstrate \< 1 g of protein in 24 hours. 13. Resolution of any acute, clinically significant treatment-related toxicity from prior therapy to Grade ≤ 1 prior to study entry, with the exception of alopecia 14. Negative human immunodeficiency virus (HIV) test at screening 15. Documented virology status of hepatitis, as confirmed by screening hepatitis B virus (HBV) and hepatitis C virus (HCV) serology tests 16. For patients with positive HBV DNA/HCV RNA, anti-HBV/HCV thrapies are coontinued during study (base on local care of stanstand) 17. For women of childbearing potential, agreement (by patient) to remain abstinent (refrain from heterosexual intercourse) or to use contraceptive methods as defined below: * Women must remain abstinent or use highly effective form(s) of contraception (i.e., one that results in a low failure rate \[\<1% per year\] when used consistently and correctly) while they are receiving atezolizumab and bevacizumab and for at least 5 months after the final dose of atezolizumab and 6 months after the final dose of bevacizumab. Women must refrain donating eggs during this same period. * A woman is considered to be of childbearing potential if she is postmenarcheal, has not reached a postmenopausal state (≥ 12 continuous months of amenorrhea with no identified cause other than menopause), and is not permanently infertile due to surgical sterilization (i.e., removal of ovaries, fallopian tubes and/or uterus), or other causes as determined by the investigator (e.g., Müllerian agenesis). The definition of childbearing potential may be adapted for alignment with local guidelines or regulations. * Examples of contraceptive methods with a failure rate of \< 1% per year include bilateral tubal ligation, male sterilization, hormonal contraceptives that inhibit ovulation, hormone-releasing intrauterine devices, and copper intrauterine devices * The reliability of sexual abstinence should be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the patient. Periodic abstinence (e.g., calendar, ovulation, symptothermal, or postovulation methods) and withdrawal are not acceptable methods of contraception. If required per local guidelines or regulations, locally recognized acceptable methods of contraception and information about the reliability of abstinence will be described in the local Informed Consent Form. 18. For men: agreement to remain abstinent (refrain from heterosexual intercourse) or use a condom, and agreement to refrain from donating sperm, as defined below: * With female partners of childbearing potential or pregnant female partners, men who are not surgically sterile must remain abstinent or use a condom plus an additional contraceptive method that together result in a failure rate of \<1% per year during the treatment period and for at least 6 months after the final dose of bevacizumab to avoid exposing the embryo. Men must refrain from donating sperm during this same period * The reliability of sexual abstinence should be evaluated in relation to the duration of the clinical trial and the preferred and usual lifestyle of the patient. Periodic abstinence (e.g., calendar, ovulation, symptothermal, or postovulation methods) and withdrawal are not acceptable methods of preventing drug exposure. If required per local guidelines or regulations, locally recognized acceptable methods of contraception and information about the reliability of abstinence will be described in the local Informed Consent Form. Patients must meet the following additional criteria for study randomization: 18\. Tumor assessed as PR or SD after 4 cycles of atezo/bev treatment as determined by the IRF according to RECIST v1.1 19. Feasibility for curative hepatic resection as assessed by the investigator 20. Physical condition and organ function allowing to undergo appropriate surgical management or atezo/bev treatment according to investigator's judgement. 21\. Treatment emerged adverse events during induction phase, if any, should have been recovered to meet the requirements of surgical or atezo/bev treatment according to investigator's judgement. 22\. Agreement and ability to comply with the treatment of Arm A or Arm B in the investigator's judgment Exclusion Criteria: 1. Known fibrolamellar HCC, sarcomatoid HCC, or mixed cholangiocarcinoma and HCC 2. Evidence of EHS, as confirmed by CT and/or MRI scans of the chest, abdomen, and pelvis 3. Evidence of HCC disease progression or complete remission prior to randomization 4. Clinically significant ascites 5. History of hepatic encephalopathy 6. Untreated or incompletely treated esophageal and/or gastric varices with bleeding or high risk for bleeding * Patients must undergo an esophagogastroduodenoscopy (EGD), and all size of varices (small to large) must be assessed and treated per local standard of care prior to enrollment. Patients who have undergone an EGD within 6 months of prior to initiation of atezo/bev treatment do not need to repeat the procedure. 7. Active or history of autoimmune disease or immune deficiency, including, but not limited to, myasthenia gravis, myositis, autoimmune hepatitis, systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, antiphospholipid antibody syndrome, Wegener granulomatosis, Sjögren syndrome, Guillain-Barré syndrome, or multiple sclerosis, with the following exceptions: * Patients with a history of autoimmune-related hypothyroidism who are on thyroidreplacement hormone are eligible for the study. * Patients with controlled Type 1 diabetes mellitus who are on an insulin regimen are eligible for the study. * Patients with eczema, psoriasis, lichen simplex chronicus, or vitiligo with dermatologic manifestations only (e.g., patients with psoriatic arthritis are excluded) are eligible for the study provided all of following conditions are met: * Rash must cover \< 10% of body surface area. * Disease is well controlled at baseline and requires only low-potency topical corticosteroids. * There is no occurrence of acute exacerbations of the underlying condition requiring psoralen plus ultraviolet A radiation, methotrexate, retinoids, biologic agents, oral calcineurin inhibitors, or high-potency or oral corticosteroids within the 12 months prior to Day 1 of Cycle 1. 8. History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or idiopathic pneumonitis, or evidence of active pneumonitis on screening chest CT scan 9. Significant cardiovascular disease (such as New York Heart Association Class II or greater cardiac disease, myocardial infarction, or cerebrovascular accident) within 3 months prior to Day 1 of Cycle 1, unstable arrhythmia, or unstable angina 10. History of malignancy other than HCC within 5 years prior to screening, with the exception of malignancies with a negligible risk of metastasis or death (e.g., 5-year OS rate \> 90%), such as adequately treated carcinoma in situ of the cervix, non-melanoma skin carcinoma, localized prostate cancer, ductal carcinoma in situ, or Stage I uterine cancer 11. Active tuberculosis 12. Severe infection within 4 weeks prior to Day 1 of Cycle 1, including, but not limited to, hospitalization for complications of infection, bacteremia, or severe pneumonia 13. Treatment with therapeutic oral or IV antibiotics within 2 weeks prior to Day 1 of Cycle 1 * Patients receiving prophylactic antibiotics (e.g., to prevent a urinary tract infection or chronic obstructive pulmonary disease exacerbation) are eligible for the study. 14. Prior allogeneic stem cell or solid organ transplantation 15. On the waiting list for liver transplantation 16. Any other disease, metabolic dysfunction, physical examination finding, or clinical laboratory finding that contraindicates the use of an investigational drug, may affect the interpretation of the results, or may render the patient at high risk from treatment complications 17. Pregnant or breastfeeding, or intending to become pregnant during the study or within 5 months after the final dose of atezolizumab or within 6 months after the final dose of bevacizumab * Women of childbearing potential must have a negative serum pregnancy test result within 14 days prior to Day 1 of Cycle 1. 18. Co-infection with HBV and HCV * Patients with a history of HCV infection but who are negative for HCV RNA by polymerase chain reaction will be considered to be negative for HCV infection. 19. Uncontrolled or symptomatic hypercalcemia (ionized calcium \> 1.5 mmol/L, calcium, \> 12mg/dL, or corrected serum calcium \> ULN) 20. History of severe allergic anaphylactic reactions to chimeric or humanized antibodies or fusion proteins 21. Known hypersensitivity to Chinese hamster ovary cell products or to any component of the atezolizumab or bevacizumab formulations 22. Any prior treatment for HCC, including systemic therapy (including investigational agents) and locoregional therapy such as TACE * Prior use of herbal therapies or traditional Chinese medicines with anti-cancer activity included in the label is allowed, but such therapies must be discontinued at least 7 days prior to study entry and are prohibited during the study. 23. Treatment with a live, attenuated vaccine within 4 weeks prior to Day 1 of Cycle 1, or anticipation of need for such a vaccine during atezolizumab treatment or within 5 months after the final dose of atezolizumab 24. Treatment with investigational therapy within 4 weeks prior to Day 1 of Cycle 1 25. Prior treatment with CD137 agonists or immune checkpoint blockade therapies, including anti-CTLA-4, anti-PD-1, and anti-PD-L1 therapeutic antibodies 26. Treatment with systemic immunostimulatory agents (including, but not limited to, interferon and interleukin-2) within 4 weeks or 5 drug elimination half-lives (whichever is longer) prior to Day 1 of Cycle 1 27. Treatment with systemic immunosuppressive medication (including, but not limited to, corticosteroids, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor-α \[TNF-α agents) within 2 weeks prior to Day 1 of Cycle 1, or anticipation of need for systemic immunosuppressive medication during study treatment, with the following exceptions: * Patients who received acute, low-dose systemic immunosuppressant medication or a one-time pulse dose of systemic immunosuppressant medication (e.g., 48 hours of corticosteroids for a contrast allergy) are eligible for the study after Medical Monitor approval has been obtained. * Patients who received mineralocorticoids (e.g., fludrocortisone), corticosteroids for chronic obstructive pulmonary disease or asthma, or low-dose corticosteroids for orthostatic hypotension or adrenal insufficiency are eligible for the study. 28. Inadequately controlled arterial hypertension (defined as systolic blood pressure \[BP\] \> 150 mmHg and/or diastolic BP \> 100 mmHg), based on an average of at least three BP readings at two or more sessions * Anti-hypertensive therapy to achieve these parameters is allowed. 29. History of hypertensive crisis or hypertensive encephalopathy 30. Significant vascular disease (e.g., aortic aneurysm requiring surgical repair or recent peripheral arterial thrombosis) within 6 months prior to Day 1 of Cycle 1 Clinical Study 31. History of hemoptysis (\> 2.5 mL of bright red blood per episode) within 1 month prior to Day 1 of Cycle 1 32. Evidence of bleeding diathesis or significant coagulopathy (in the absence of therapeutic anticoagulation) 33. Current or recent (within 10 days of Day 1 of Cycle 1) use of aspirin (\> 325 mg/day) or current or recent treatment with dipyramidole, ticlopidine, clopidogrel, and cilostazol 34. Current or recent (within 10 days prior to Day 1 of Cycle 1) use of full-dose oral or parenteral anticoagulants or thrombolytic agents for therapeutic (as opposed to prophylactic) purpose * Prophylactic anticoagulation for the patency of venous access devices is allowed provided the activity of the agent results in an INR and aPTT is within normal limits (according to institutional standards) within 14 days prior to Day 1 of Cycle 1. * Prophylactic use of low-molecular-weight heparin (LMWH) (i.e., enoxaparin 40 mg/day) is allowed. However, the use of direct oral anticoagulant therapies such as dabigatran (Pradaxa®) and rivaroxaban (Xarelto®) is not recommended due to bleeding risk. 35. Core biopsy or other minor surgical procedure, excluding placement of a vascular access device, within 3 days prior to Day 1 of Cycle 1 36. History of abdominal or tracheoesophageal fistula, gastrointestinal (GI) perforation, or intraabdominal abscess within 6 months prior to Day 1 of Cycle 1 37. Evidence of abdominal free air that is not explained by paracentesis or recent surgical procedure 38. Serious, non-healing or dehiscing wound, active ulcer, or untreated bone fracture 39. Major surgical procedure within 4 weeks prior to Day 1 of Cycle 1 or anticipation of need for a major surgical procedure during the study 40. History of intra-abdominal inflammatory process within 6 months prior to Day 1 of Cycle 1, including, but not limited to, peptic ulcer disease, diverticulitis, or colitis 41. History of intestinal obstruction and/or clinical signs or symptoms of GI obstruction including sub-occlusive disease related to the underlying disease or requirement for routine parenteral hydration, parenteral nutrition, or tube feeding prior to initiation of study treatment Patients with signs/symptoms of sub-/occlusive syndrome/intestinal obstruction at time of initial diagnosis may be enrolled if they had received definitive (surgical) treatment for symptom resolution. 42. Radiotherapy within 28 days and abdominal/ pelvic radiotherapy within 60 days prior to initiation of study treatment. 43. Chronic daily treatment with a non-steroidal anti-inflammatory drugs (NSAIDs) * Occasional use of NSAIDs for the symptomatic relief of medical conditions such asheadache or fever is allowed.