Across TCGA pan-cancer cohorts, PPM1J mass-spec protein differs between tumor and matched normal tissue in 2 of 18 cancer types tested, making tumor–normal expression one of PPM1J’s most consistent transcriptional readouts.
The strongest signal is observed in lung adenocarcinoma (LUAD), where PPM1J mass-spec protein is more highly expressed in tumor relative to normal tissue. In most cancer types PPM1J is over-expressed in tumor, although a few such as LSCC show the opposite, repressed pattern.
LUAD and LSCC are the cancer types where PPM1J tumor–normal differential expression is most reproducible.