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Two cases of intrathoracic tumor, different in histology and accompanied by hyperamylasemia, were studied ultrastructurally, histochemically, and biochemically. The ultrastructure of the tumor cell cytoplasm showed many zymogen granules in case 1 and smaller cored granules in addition to zymogen granules in case 2. Both tumors contained not only a large amount of amylase, which was electrophoretically of saliva type with three components, but also significant amounts of immunoreactive ACTH and beta-MSH. Starch film and immunofluorescence showed that the tumor cells stored amylase. It was concluded from these findings that the tumor cells ectopically producing amylase, which showed differentiation toward the cells with zymogen production, could differentiate toward the cells of ACTH-MSH system at the same time.
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Pediatric research,
