For example, overexpression of CTCF has been reported to occur in breast cancer (Docquier et al., 2005), cervical cancer (Velazquez‐Hernandez et al., 2015), ovarian cancer (Zhao et al., 2017), and hepatocellular carcinoma (Zhang et al., 2017), and has been linked to adverse tumor features in some of them (Zhang et al., 2017; Zhao et al., 2017). The gene discussed is CTCF; the disease is breast cancer.