“…An additional 56 articles were excluded, including 56 articles with unavailable data on the genotype frequency of CC, CT, and TT within GSTP1 rs1138272, and 4 articles in which the data were not in HWE. After a quality evaluation, 40 articles (Harris et al, 1998; Saarikoski et al, 1998; Park et al, 1999; Wadelius et al, 1999; Welfare et al, 1999; Marshall et al, 2000; Stanulla et al, 2000; Krajinovic et al, 2002; Wang et al, 2003, 2011; Sorensen et al, 2004; Yang et al, 2004; Garcia-Closas et al, 2005; Landi et al, 2005, 2007; Moore et al, 2005; De Roos et al, 2006; Lira et al, 2006; Marciniak et al, 2006; Jiao et al, 2007; Li et al, 2007, 2010; Murphy et al, 2007; Al-Dayel et al, 2008; Kury et al, 2008; Siraj et al, 2008; Van Emburgh et al, 2008; Zienolddiny et al, 2008; Canova et al, 2009; Northwood et al, 2010; Sainz et al, 2011; Ebrahimkhani et al, 2012; Garcia-Gonzalez et al, 2012; Ibarrola-Villava et al, 2012; Dura et al, 2013; Oskina et al, 2014; Ghatak et al, 2016; De Mattia et al, 2017; Minina et al, 2017; Rajesh et al, 2018) of good quality were included. Finally, we included a total of 43 case-control studies for our quantitative synthesis.…”