XCL2 and glioblastoma: Univariate Cox regression analysis of OS (Figure 2A) revealed that high XCL2 levels were significant risk factors for BRCA (P = 0.011), GBM (P = 0.046), HNSC (P = 0.005), KIRC (P = 0.001), LGG (P = 0.028), LUAD (P = 0.031), SARC (P = 0.023), SKCM (P < 0.001), THYM (P = 0.015), UCEC (P = 0.013), and UVM (P = 0.01).