Across TCGA pan-cancer cohorts, ICOS mass-spec protein is linked to patient survival in 3 of 34 cancer types, making it a survival-associated ICOS data layer compared with 24 for mass-spec protein and 3 for mutation status.
The strongest signal is observed in lung squamous cell carcinoma (LSCC), where higher ICOS mass-spec protein is associated with worse disease-free survival. In most high-consensus cancer types, elevated ICOS expression acts as an unfavorable survival marker, although some lineages such as LUAD and HNSC show a favorable association.
LSCC, LUAD, and HNSC are the cancer types where ICOS mass-spec protein most reproducibly stratifies survival.