Of the 298 ADME genes, 157 genes (52%) were expressed in all 21 cancers and only 12 genes (4%) (CYP11B1, CYP11B2, DHRS7C, GPX5, GPX6, GSTA3, GSTA5, LOC731356, PLGLB1, SLCO6A1, SULT1C1, UGT2B17) were not expressed in any of the 21 cancer types analysed (Table S1). This evidence concerns the gene SLCO6A1 and cancer.