GPX1 and cancer: GPX1 is located on chromosome position 3p21 and contains a genetic polymorphism (rs1050450) that results in either a proline (Pro) or leucine (Leu) at codon 198, described to be a risk factor for the development of various cancers, including lung cancer (Lee et al., 2006), prostate cancer, (Liwei, Wei, & Ruifa, 2012; Parlaktas, Atilgan, Gencten, Benli, & Ozyurt, 2015) and bladder cancer (Men, Zhang, Yang, & Shen, 2014; Paz‐y‐Mino et al., 2010).