Commonly, the melanoma associated chondroitin sulphate proteoglycan (MCSP, also known as chondroitin sulphate proteoglycan 4—CSPG4, high molecular weight-melanoma associated antigen—HMW-MAA or neural glial antigen 2—NG2) has been used as target for capture of UM CTCs. This evidence concerns the gene CSPG4 and melanoma.