CCNB1 and breast carcinoma: CXCR4 silencing inhibits cell growth in human carcinoma cell lines45 and increased expression of CXCR4 in G2/M phases has been reported in breast cancer cell lines where proteomic analysis revealed crosstalk between CXCR4 and G2‐M transition proteins, such as PLK1 and Cyclin B1.46