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