CD82 (Cluster of Differentiation 82) is a suppressor of tumorigenicity 6 and of metastasis in prostate, pancreatic, hepatocellular, cervical and colorectal carcinomas. It associates with CD4 or CD8 and delivers co-stimulatory signals for the TCR/CD3 pathway. Expression is found on T cells, NK cells, monocytes, granulocytes and platelets.