TK1 and glioblastoma: For receptors, significant inverse associations between TK1 and CCR1, CXCR3, and CX3CR1 were identified for GBM, whereas positive associations of TK1 with CCR2, CCR5, CCR7, CCR10, CXCR4, and CXCR6 were found in LGG (Table S9).