Across TCGA pan-cancer cohorts, XYLB mass-spec protein differs between tumor and matched normal tissue in 2 of 18 cancer types tested, making tumor–normal expression one of XYLB’s most consistent transcriptional readouts.
The strongest signal is observed in clear cell renal cell carcinoma (CCRCC), where XYLB mass-spec protein is repressed in tumor relative to normal tissue. In most cancer types XYLB is over-expressed in tumor, although a few such as CCRCC and HNSC show the opposite, repressed pattern.
CCRCC and HNSC are the cancer types where XYLB tumor–normal differential expression is most reproducible.