Soon after, the non‐canonical member of the IKK family, IKKε, was shown to induce breast cancer (Boehm et al, 2007) and to be overexpressed in ovarian (Guo et al, 2009), prostate (Péant et al, 2011) and non‐small cell lung cancers (Guo et al, 2013), pancreatic ductal carcinoma (Cheng et al, 2011) and glioma (Guan et al, 2011). Here, IKBKE is linked to breast cancer.