Across TCGA pan-cancer cohorts, IGFBP5 mass-spec protein differs between tumor and matched normal tissue in 5 of 18 cancer types tested, making tumor–normal expression one of IGFBP5’s most consistent transcriptional readouts.
The strongest signal is observed in lung squamous cell carcinoma (LSCC), where IGFBP5 mass-spec protein is more highly expressed in tumor relative to normal tissue. In most cancer types IGFBP5 is over-expressed in tumor, although a few such as HNSC and CCRCC show the opposite, repressed pattern.
LSCC, HNSC, and PDAC are the cancer types where IGFBP5 tumor–normal differential expression is most reproducible.