Across TCGA pan-cancer cohorts, PPY mass-spec protein is linked to patient survival in 1 of 34 cancer types, making it a survival-associated PPY data layer compared with 21 for mass-spec protein.
The strongest signal is observed in pancreatic ductal adenocarcinoma (PDAC), where higher PPY mass-spec protein is associated with better overall survival. In most high-consensus cancer types, elevated PPY expression acts as an unfavorable survival marker, although some lineages such as PDAC show a favorable association.
PDAC are the cancer types where PPY mass-spec protein most reproducibly stratifies survival.