Across TCGA pan-cancer cohorts, SLC6A6 mass-spec protein differs between tumor and matched normal tissue in 3 of 18 cancer types tested, making tumor–normal expression one of SLC6A6’s most consistent transcriptional readouts.
The strongest signal is observed in clear cell renal cell carcinoma (CCRCC), where SLC6A6 mass-spec protein is repressed in tumor relative to normal tissue. In most cancer types SLC6A6 is over-expressed in tumor, although a few such as CCRCC show the opposite, repressed pattern.
CCRCC, LSCC, and LUAD are the cancer types where SLC6A6 tumor–normal differential expression is most reproducible.