GPX2 and colorectal cancer: SELENOH downregulated colorectal cancer cells showed increased growth properties (Kipp, 2020; Bertz et al., 2018), and loss of GPX2 (Kipp, 2020; Emmink et al., 2014) and SELENOF (Kipp, 2020; Tsuji et al., 2011) impaired growth of colorectal cancer cells.