Tumours in the right-sided colon showed worse outcomes than those in the left-sided colon and rectum in patients with mCRC with wild-type RAS, suggesting that genetic alterations other than BRAF V600E could be responsible for the poor prognosis of right-sided tumours (von Einem et al, 2014; Brulé et al, 2015). Here, BRAF is linked to neoplasm.