HPRT1 reference gene findings were compared with those of the GPX3 gene, which exhibited little variation in both normal and tumor samples examined and is thus deemed a reliable and stable reference gene for RT-PCR (forward 5′-GGAAAGGGTGTT TATTCCTCA-3′, reverse 5′-TCCCAGGTCAGC AAAGAA-3′). Here, GPX3 is linked to neoplasm.