GAPDH and carcinoma: We analyzed the expression of the stemness genes c-Myc, KLF4, Nanog, and OCT3/4 that were previously normalized to ACTB (Fig 1), with the identified top-ranking HKG for CSC and native cells, in sarcoma and carcinoma, respectively (GAPDH and YWHAZ for sarcoma, and PPIA and HMBS for carcinoma).