Several studies have addressed the role of GSTT1 and GSTM1 gene deletions as risk factors in breast carcinoma, but the results are conflicting (Helzlsouer et al, 1998; Gumundsdottir et al, 2001; Krajinovic et al, 2001; Mitrunen et al, 2001). Here, GSTM1 is linked to breast carcinoma.