TNFRSF9 and head and neck squamous cell carcinoma: From the analysis on 34 distinct cancer types using data available in TCGA, we found that high TI-Treg-specific expression level of TNFRSF9 could predict poor survival in four additional cancer types: glioma (GBMLGG), head and neck squamous cell carcinoma (HNSC), pancreatic adenocarcinoma (PAAD) and uveal melanoma (UVM) (Fig. S2).