Across TCGA pan-cancer cohorts, S1PR1 mass-spec protein differs between tumor and matched normal tissue in 3 of 18 cancer types tested, making tumor–normal expression one of S1PR1’s most consistent transcriptional readouts.
The strongest signal is observed in lung squamous cell carcinoma (LSCC), where S1PR1 mass-spec protein is repressed in tumor relative to normal tissue. In most cancer types S1PR1 is over-expressed in tumor, although a few such as LSCC and LUAD show the opposite, repressed pattern.
LSCC, LUAD, and CCRCC are the cancer types where S1PR1 tumor–normal differential expression is most reproducible.