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Journal of Clinical Endocrinology & Metabolism, Vol 52, 457-462, Copyright © 1981 by Endocrine Society

ARTICLES

Elevated levels of circulating carcinoembryonic antigen in hypothyroidism

N Amino, R Kuro, Y Yabu, SI Takai, M Kawashima, S Morimoto, K Ichihara, K Miyai and Y Kumahara

The level of circulating carcinoembryonic antigen (CEA) was measured in 148 patients with various thyroid diseases. A significantly high frequency of positive CEA was observed in hypothyroid patients with Hashimoto's disease, but the serum CEA levels were not correlated with the serum calcitonin concentrations in Hashimoto's disease. The CEA levels were inversely correlated with the serum T4 concentrations (P less than 0.001) and were positively correlated with the serum TSH concentrations (P less than 0.001), but not with the titers of serum antithyroid antibodies or the size of goiter in autoimmune thyroid disease. Moreover, the increase in CEA was significantly related to the duration of hypothyroidism (P less than 0.001). The high CEA levels in all hypothyroid patients decreased when the patients attained a euthyroid state after thyroid hormone therapy for 4-9 months. The gradual decrease in the serum CEA levels during treatment was roughly correlated with the decreases in serum cholesterol concentration and serum lactic dehydrogenase and glutamic oxalacetic transaminase activities. On Sephadex G-200 column chromatography of serum from hypothyroid patients, the CEA immunoreactivity, like purified standard CEA, was recovered in the large molecular weight fraction. These findings indicate that elevated CEA levels in hypothyroid patients do not necessarily indicate malignancy. CEA elevation in hypothyroidism may be caused by decreased degradation of CEA.


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Are Serum Carcinoembryonic Antigen Levels Associated With Carotid Atherosclerosis in Japanese Men?
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