GAPDH and cancer: Interestingly, we observed that GAPDH, GUSB, IPO8, RPL13, RPL32, and UBC genes, as well as RPLP0 + TBP, RPL13 + RPL32, RPL13 + RPLP0, and ACTB + TBP RG pairs, were the only assays whose expression did not depend (P > 0.05) on cancer progression.