title: Toward an early diagnosis of carcinoma of the colon.
mesh_terms: D003110:Colonic Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D009780:Occult Blood; D011859:Radiography; D012004:Rectal Neoplasms / Q000175:diagnosis; D012812:Sigmoidoscopy; D013997:Time Factors