Across TCGA pan-cancer cohorts, COL2A1 mass-spec protein differs between tumor and matched normal tissue in 3 of 18 cancer types tested, making tumor–normal expression one of COL2A1’s most consistent transcriptional readouts.
The strongest signal is observed in colon adenocarcinoma (COAD), where COL2A1 mass-spec protein is repressed in tumor relative to normal tissue. In most cancer types COL2A1 is over-expressed in tumor, although a few such as COAD and HNSC show the opposite, repressed pattern.
COAD, HNSC, and CCRCC are the cancer types where COL2A1 tumor–normal differential expression is most reproducible.