CXCR4 and breast cancer: Reactivation of CXCR4 by AZA and/or TSA has been previously demonstrated also in four pancreatic cancer cell lines (AsPC1, BxPC3, Capan1, Capan2, CFPAC1, and MiaPaCa2) [19] and two breast cancer cell lines (MCF-7 and ZR-75-1) [42, 43].