Across TCGA pan-cancer cohorts, SAMD9L mass-spec protein differs between tumor and matched normal tissue in 5 of 18 cancer types tested, making tumor–normal expression one of SAMD9L’s most consistent transcriptional readouts.
The strongest signal is observed in head and neck squamous cell carcinoma (HNSC), where SAMD9L mass-spec protein is more highly expressed in tumor relative to normal tissue. In most cancer types SAMD9L is over-expressed in tumor, although a few such as LSCC and LUAD show the opposite, repressed pattern.
HNSC, LSCC, and PDAC are the cancer types where SAMD9L tumor–normal differential expression is most reproducible.