This is in accordance with results found by Chacko et al. for other XME genes [10] (CYP1A1, GSTT1 and GSTM1) but our results disagree with the findings of Han et al. which showed that polymorphisms of XMEs genes such as CYP1A1, CYP19 and CYP1B1 can influence clinical pathological features of breast carcinoma [9]. Here, GSTM1 is linked to breast carcinoma.