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