Blood levels of carcinoembryonic antigen (CEA), alpha-fetoprotein, ferritin, ACTH. triiodothyronine and thyroxin were measured by radioimmunoassay in 217 cases of lung, hepatopancreatoduodenal and colonic cancer, 61 patients with nontumor pathology of those sites and in 37 healthy controls. CEA proved the most reliable marker of lung and colonic cancer and tumor-related mechanical jaundice, its lowest concentration in 65-100% of cancer patients exceeding the highest levels observed in controls. In the colorectal group, CEA level returned to normal after radical surgery and rose again at recurrence or distant metastases. Ferritin, cortisol and ACTH appeared less efficient.
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