KCNN4 and cancer: Expression of SK4 and BK in cancer cells follows a cell cycle‐dependent mode (Ouadid‐Ahidouch et al., 2004; Pardo et al., 1998) and the mitogen‐dependent regulation of KCa activity supports a role for both channels in malignant (Faouzi et al., 2010; Lallet‐Daher et al., 2009; Wang et al., 2007a) and nonmalignant cell proliferation (Grgic et al., 2005; Khanna et al., 1999; Toyama et al., 2008; Yu et al., 2013).