CXCR4 and cancer: As CD164 acted as a CXCR4‐associated sialomucin, the relationship between CD164 and CXCR4 has been researched in many different cancers.15, 23 In our study, we used the immunohistochemistry to observe the association between the expression of CD164 and CXCR4 in tumor tissues by uninterrupted slicing.