Synuclein gamma (SNCG) induces migration, invasion and metastasis of tumor cells. It promotes the migration of human breast adenocarcinoma cell line (MCF7) by activating extracellular-signal regulated kinase (Erk) pathway and disrupting cell-cell junctions. SNCG is associated with breast or ovarian cancer progression. Urine SNCG is used as a prognostic biomarker for bladder cancer.