GSTP1 and breast cancer: The results were controversial in breast cancer, a number of studies found overexpressed GSTP1 gene (Batist et al., 1986; Huang et al., 2003; Muftin et al., 2015; Vecanova et al., 2011), while others reported underexpressed GSTP1 gene (Esteller et al., 1998; Fang et al., 2015).