VCX2 and melanoma: The VCX2 protein was expressed in only 1/11 breast cancer cell lines (i.e., T-47-D) and in 4/19 melanoma cell lines (i.e., FM45, FM79, A375, and Sk-Mel-37b) and three of the cell lines showed a very low number (<5%) of VCX2 positive cells (i.e., FM79, A375, and Sk-Mel-37b) (Figure 2A).