CD276, also known as B7-H3, is an antigen highly expressed in several cancer types, including hepatocellular carcinoma (HCC, 79%-94% expression) and closely tied to aggressiveness and poor survival, but shows very low expression in normal tissues. Increasing evidence exists indicating B7-H3 has immune inhibitory functions, thus reducing interferon levels released by T cells and suppressing cytotoxic activity of natural killer cells, thereby aiding in tumor immune evasion.