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