GAPDH and thyroid cancer, nonmedullary, 2: HPRT1, SYMPK, and TBP were the best genes for the FTC subtype (Fig. 6E,F), HPRT1, ACTB and GAPDH for the PDTC subtype (Fig. 6G,H), and B2M, GUSB, and ACTB for the ATC subtype (Fig. 6I,J).