CYR61 is a member of the CYR61/CTGF/NOV (CCN) protein family. CYR61 participated in cell mitogenesis, cellular adhesion, migration, differentiation, angiogenesis, and survival. Cyr61 is especially associated with diseases related to chronic inﬂammation, including RA, Crohn’s disease and ulcerative colitis. CYR61 may serve essential roles as either an oncogene or a tumor suppressor, depending on the cancer cell type. CYR61 also induces angiogenesis, which supplies oxygen and nutrients to tumors during growth. CYR61 can also play a role in the proliferation, invasion, survival, and metastasis of cancer cells.