Immunohistological Studies of Nonthyroidal Calcitonin-Producing Tumors*

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Abstract
A series of oat cell carcinomas of the lung and some corresponding sputum specimens were studied along with other tumors by immunoperoxidase histology for the presence of calcitonin, β-endorphin, and ACTH. Sixteen of 31 tissues were positive for calcitonin, 12 of 14 were positive for β-endorphin, and 11 of 14 were positive for ACTH immunoreactivity. Many tissues contained all 3 peptides, and in some sections these peptide immunoreactivities appeared to be present in the same cells. These studies suggest that there is a relationship in oat cell carcinoma of the lung and in other tumors among the 3 peptides, although the basis of this relationship is not clear.

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