The most stable expressed gene in MM cancer tissues was ACTB (Figure 1D and Figure 3C), with a lower average between mean SD and mean Ct (1.17 for ACTB; 1.22 for HPRT1; 1.62 for TFRC), while in CSCC cancer tissues it was TFRC (1.00 for TFRC; 1.13 for HPRT1; 1.45 for ACTB) (Figure 1C and Figure 3C). The gene discussed is HPRT1; the disease is cancer.