1. http://www.cancer.org/Cancer/ColonandRectumCancer/DetailedGuide/colorectal-cancer-key-statistics
2. Howlader N, Noone AM, Krapcho M et al. (editors). SEER cancer statistics review, 1975–2008, National Cancer Institute. Bethesda, http://seer.cancer.gov/csr/1975_2008/ , based on Nov 2010 SEER data submission.
3. Day DW, Morson BC. The adenoma-carcinoma sequence. Major Probl Pathol. 1978;10:58–71.
4. Muto T, Bussey HJ, Morson BC. The evolution of cancer of the colon and rectum. Cancer. 1975;36(6):2251–70.
5. Vogelstein B, Fearon ER, Hamilton SR, et al. Genetic alterations during colorectal-tumor development. N Engl J Med. 1988;319(9):525–32.