CXCR1 and nonpapillary renal cell carcinoma: Previous studies have shown that CXCRs are expressed at high levels in a variety of tumor tissues (Wang et al., 2018; Zheng et al., 2018; Jiang et al., 2019; Mir et al., 2019), but this study has, for the first time, summarized the expression of CXCR1-7 in ccRCC.