BCL9 and colorectal carcinoma: In mouse model of CRC, BCL9 and its paralogue BCL9L promote both early stages of carcinogenesis (Brembeck et al., 2011), as well as late‐occurring traits associated with EMT and cancer metastasis (Brembeck et al., 2004; Deka et al., 2010; Mani et al., 2009).