CXCR1 and nonpapillary renal cell carcinoma: Moreover, 7 CpGs of CXCR1, 4 CpGs of CXCR2, 1 CpG of CXCR3, 15 CpGs of CXCR4, 13 CpGs of CXCR5, 3 CpGs of CXCR6, and 10 CpGs of CXCR7 were related to the prognosis of ccRCC patients (p < 0.05, Table 2).