Survival of cancer with BRAF mutations, often associated with right-sided colon cancer, may have resulted in poorer survival than cancer with KRAS mutations, often seen in left-sided colon cancer.35–37 The increased mortality rate for rectal cancer after 6 months (online supplemental table 6) may suggest the local recurrence, which is common in rectal cancer compared with cancer of the rectosigmoid junction. Here, BRAF is linked to cancer.