Radioimmunoassay of carcino-embryonic antigen was conducted in lung cancer patients before and after surgery. Elevated concentrations of the antigen before operation was registered in 84.8% of cases. Antigen levels returned to normal after radical removal of tumor and rose sharply as a result of chemotherapy toxicity. A similar pattern of changes in carcino-embryonic antigen level was observed in cases of disseminated and recurrent cancer.
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