The immunohistochemical and ultrastructural findings of 7 primary argyrophilic tumors of the breast are described. Five cases were selected because of a growth pattern reminiscent of a « carcinoid » tumor and 2 were obtained from 70 consecutive common carcinomas. All patients were females (mean age 68.8) and none had clinical evidence of hormonal secretion. On ultrastructural examination dense-core granules were seen in addition to findings more suggestive of a common carcinoma. Immunoperoxidase stainings for ACTH, calcitonin etc. were negative in all tumors. The authors believe that organoid growth pattern, argyrophilia and dense-core neurosecretory-like granules are not sufficient elements to demonstrate the endocrine nature of a breast neoplasm.
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