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Previous Volume 296:835-838 April 14, 1977 Number 15 Next

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Abstract

We studied prospectively 46 members of a kindred with familial medullary thyroid carcinoma to determine the importance of possible cellular immune reactivity to tumor antigen. We evaluated in vitro production of macrophage-migration-inhibitory factor and 3H-thymidine uptake by lymphocytes from patients, family members and normal subjects in response to extracts of medullary thyroid carcinoma and normal thyroid tissue. Lymphocytes from 12 of 18 patients with medullary thyroid carcinoma and four of seven patients with C-cell hyperplasia produced migration inhibitory factor or proliferated (or both) in response to tumor antigen. In contrast, cells from only two of 25 normal subjects and two of nine family members not genetically at risk for medullary thyroid carcinoma made migration inhibitory factor and proliferated to tumor antigen. Of particular interest, lymphocytes from six of 12 clinically normal family members genetically at risk for medullary thyroid carcinoma exhibited cellular immune reactivity to tumor antigen.

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