Several studies highlighted the role of XME gene polymorphisms such as CYP1A1, CYP1B1, CYP2D6, mEH, GSTT1, GSTM1 and NAT1 in treatment efficacy as well as survival after treatment of breast carcinoma [10,12,13,31,41]. This evidence concerns the gene CYP1A1 and breast carcinoma.