PRIMARY OBJECTIVE:~I. To investigate the confirmed objective response rate (ORR) of nivolumab and ipilimumab in patients with hepatocellular carcinoma (HCC) who have progressed radiographically on atezolizumab/bevacizumab that necessitates change in treatment.~SECONDARY OBJECTIVES:~I. To determine the overall survival (OS) in hepatocellular carcinoma (HCC) patients treated with nivolumab and ipilimumab who have progressed radiographically on atezolizumab / bevacizumab that necessitates change in treatment.~II. To determine the progression free survival (PFS) in hepatocellular carcinoma (HCC) patients treated with nivolumab and ipilimumab who have progressed radiographically on atezolizumab/bevacizumab that necessitates change in treatment.~III. To determine the disease control rate in hepatocellular carcinoma (HCC) patients treated with nivolumab and ipilimumab who have progressed radiographically on atezolizumab/bevacizumab that necessitates change in treatment.~IV. To assess the frequency and severity of adverse events in hepatocellular carcinoma (HCC) patients treated with nivolumab and ipilimumab who have progressed radiographically on atezolizumab/bevacizumab that necessitates change in treatment.~OUTLINE:~Patients receive nivolumab intravenously (IV) over 30 minutes and ipilimumab IV over 90 minutes on day 1. Treatment repeats every 21 days for 4 cycles in the absence of disease progression or unacceptable toxicity. Patients then receive nivolumab IV over 30 minutes on day 1. Treatment repeats every 28 days for up to 24 cycles in the absence of disease progression or unacceptable toxicity.~After completion of study treatment, patients are followed up at 30 days and then every 3 months for up to 2 years from registration.
This phase II trial tests whether nivolumab and ipilimumab works to shrink tumors in patients with liver cancer that has spread to nearby tissue or lymph nodes (locally advanced), has spread to other places in the body (metastatic), or cannot be removed by surgery (unresectable). Immunotherapy with monoclonal antibodies, such as nivolumab and ipilimumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Nivolumab and ipilimumab may be effective in killing tumor cells in patients with liver cancer.