The plasma levels of carcinoembryonic antigen were increased in 80% of 49 patients with bronchial carcinoma and in 68% of 25 patients with an acute exacerbation of chronic bronchitis. There was no statistically significant difference between the two groups. A single determination of the plasma carcinoembryonic antigen level has no prognostic value in patients with bronchial carcinoma.
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Pauwels et al. (1975) studied this question.
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