A Study to Determine Whether Chemotherapy and Atezolizumab is Better Than Chemotherapy, Bevacizumab and Atezolizumab in Patients With Advanced Liver Cancer

This phase II trial compares the effect of adding bevacizumab and atezolizumab to gemcitabine and cisplatin (chemotherapy) versus chemotherapy and atezolizumab in treating patients with liver cancer that cannot be removed by surgery (unresectable) or that may have spread from where it first started to nearby tissue, lymph nodes, or distant parts of the body (advanced). Immunotherapy with monoclonal antibodies, such as atezolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Bevacizumab is in a class of medications called antiangiogenic agents. It works by stopping the formation of blood vessels that bring oxygen and nutrients to tumor. This may slow the growth and spread of tumor. Chemotherapy drugs, such as gemcitabine and cisplatin, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Giving bevacizumab and atezolizumab with chemotherapy may kill more tumor cells in patients liver cancer than chemotherapy and atezolizumab.