CMTM6 and cancer: To study the regulation of PD-L1 through CMTM6 in clinical samples, we analyzed both PD-L1 and CMTM6 expression in the same set of cancer samples by immunohistochemistry and have demonstrated the expression of CMTM6 and PD-L1 in 15 and 8 out of 19 types of cancers, respectively.