The lack of association of GSTM1 null genotype with breast cancer has also been seen in Iranian (Saadat et al., 2001), Lebanese (Zgheib et al., 2013), Pakistani (Sohail et al., 2013), Taiwanese (Chang et al., 2006), Icelandic (Gudmundsdottir et al., 2001), Mexican (Rodriguez et al., 2014), and Caucasian and African-American (Van Emburgh et al., 2008) populations. Here, GSTM1 is linked to breast cancer.