title: Radiation as a risk factor in the natural history of colorectal cancer.
mesh_terms: D003110:Colonic Neoplasms / Q000209:etiology*; D006801:Humans; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology / Q000209:etiology*; D011878:Radiotherapy / Q000009:adverse effects*; D012004:Rectal Neoplasms / Q000209:etiology*; D012306:Risk; D014481:United States