NFE2L2 and breast cancer: Unfortunately, only five studies that focus on the role of mitochondrial superoxide dismutase (SOD2) (rs4880) genetic polymorphism in BC risk are available (Cengiz et al. 2007; Hung et al. 2004; Kucukgergin et al. 2012; Terry et al. 2005; Vineis et al. 2007) and two studies investigated the role of GSTA1 (rs3957357) (Komiya et al. 2005; Matic et al. 2013), whereas studies on NRF2 (rs6721961) genetic polymorphisms in urinary BC risk are still missing.