Across TCGA pan-cancer cohorts, HTR3D RNA differs between tumor and matched normal tissue in 3 of 18 cancer types tested, making tumor–normal expression one of HTR3D’s most consistent transcriptional readouts.
The strongest signal is observed in kidney renal clear cell carcinoma (KIRC), where HTR3D RNA is repressed in tumor relative to normal tissue. In most cancer types HTR3D is over-expressed in tumor, although a few such as KIRC and KICH show the opposite, repressed pattern.
KIRC, KICH, and BRCA are the cancer types where HTR3D tumor–normal differential expression is most reproducible.