TNFRSF9 and esophageal squamous cell carcinoma: Noteworthy findings included TNFRSF9 ranking among the top three co-expressed genes in BRCA, COAD, ESCA, ESAD, ESCC, GBM, LUSC, OV, and DLBC (with correlation coefficients exceeding 0.5 but not ranking first), and CD274 ranking among the top three in BLCA, BRCA, CESC, COAD, READ, CRC, LAML, LGG, LUAD, OSCC, PCPG, PRAD, READ, SARC, SKCM, STAD, and THCA.