“…We therefore began a long-term study of patients with chronic inflammatory disease of the gastrointestinal tract at high risk for cancer of the colon (Fennessy, Sparberg, and Kirsner, 1968;Devroede, Taylor, Sauer, Jackman, and Stickler, 1971;Truelove, 1971). Plasma CEA levels in 112 patients with ulcerative or granulomatous disease were related to their age and surgical status as well as to the duration, severity, extent, and type of disease of the patients.…”