GSTP1 and type 2 diabetes mellitus: Some studies suggested that the GSTP1 polymorphism is associated with susceptibility to T2DM (Bid et al., 2010[6]; Amer et al., 2012[4]; Mastana et al., 2013[17]; Vats et al., 2013[34]; Rao et al., 2014[22]; Zaki et al., 2015[36]; Stoian et al., 2015[29]; Mergani et al., 2016[18]), other reports, however, do not support the finding (Yalin et al., 2007[35]; Oniki et al., 2008[20]; Tsai et al., 2011[33]; Moasser et al., 2012[19]; Gönül et al., 2012[10]; Grubisa et al., 2013[11]; Abbasi et al., 2014[1]; Rasheed et al., 2016[23]).