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Journal of Clinical Endocrinology & Metabolism, Vol 48, 66-71, Copyright © 1979 by Endocrine Society

ARTICLES

Acromegaly associated with a bronchial carcinoid tumor: evidence for ectopic production of growth hormone-releasing activity

M Saeed uz Zafar, RC Mellinger, G Fine, M Szabo and LA Frohman

A patient with acromegaly, pituitary enlargement, and elevated plasma GH levels also had a bronchial carcinoid tumor. Signs and symptoms of active acromegaly along with elevated GH levels persisted for 11 yr after hypophysectomy and pituitary stalk section. Resection of the bronchial carcinoid reduced plasma GH to barely detectable levels. Extracts of the frozen carcinoid tumor were devoid of significant GH, but when added to isolated pituitary cells of estrogen-primed male rats in 4-day primary culture exhibited specific GH-releasing activity in vitro. These findings strongly suggest that the patient's acromegaly resulted from continual stimulation of pituitary somatotrophs by a GH- releasing factor secreted by the bronchial carcinoid.


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