We chose genes that were differentially expressed on mRNA level in all three cell lines (STAT1 and BST2) and genes that were upregulated in only one (CXCL10 in MKL-1) or two (CD74 in MKL-1 and MKL-2) of the MCC cell lines. This evidence concerns the gene CXCL10 and Merkel cell skin cancer.