(nih-VOL-yoo-mab) 
A drug that binds to the protein PD-1 to help immune cells kill cancer cells better and is used to treat many different types of cancer. These include cancers that express the protein PD-L1 or that have certain mutations (changes) in genes involved in DNA repair. Nivolumab is used alone or with other drugs to treat certain types of classic Hodgkin lymphoma, colorectal cancer, esophageal cancer, gastroesophageal junction cancer, head and neck squamous cell carcinoma, hepatocellular carcinoma (a type of liver cancer), malignant pleural mesothelioma, melanoma, non-small cell lung cancer, renal cell carcinoma (a type of kidney cancer), stomach cancer, and urothelial carcinoma (a type of bladder or urinary tract cancer). It is also being studied in the treatment of other types of cancer. Nivolumab may block PD-1 and help the immune system kill cancer cells. It is a type of monoclonal antibody and a type of immune checkpoint inhibitor. Also called Opdivo.