CXCL12 and renal cell carcinoma: The results showed that the rs1799782 genotype (G:A) of the XRCC1 gene was significantly different between different pathohistological types of RCC (p < 0.05), whereas no statistically significant difference was found between the rs1801157 genotype of the SDF-1ɑ gene and clinicopathological features, as shown in Tables 5 and 6.