NGFR and melanoma: Nevertheless, a variety of markers associated with some melanoma-specific cell-surface epitopes have been proposed, such as MCAM/MUC18/CD146 and MSCP/NG2 (melanoma-associated chondroitin sulfate), together with stem cell markers, such as ABCB5 (ATP-binging cassette subfamily member B) and CD271 (Boiko et al., 2010; Khoja et al., 2013; Luo et al., 2014).