Across TCGA pan-cancer cohorts, CD99 mass-spec protein is linked to patient survival in 5 of 34 cancer types, making it a survival-associated CD99 data layer compared with 26 for mass-spec protein and 2 for mutation status.
The strongest signal is observed in head and neck squamous cell carcinoma (HNSC), where higher CD99 mass-spec protein is associated with worse overall survival. In most high-consensus cancer types, elevated CD99 expression acts as an unfavorable survival marker, although some lineages such as UCEC and PDAC show a favorable association.
HNSC, LSCC, and UCEC are the cancer types where CD99 mass-spec protein most reproducibly stratifies survival.