Morphological, histochemical and biochemical perculiarities of liver hyperplastic nodules induced by different chemical carcinogens are regarded. The presence of basophylic atypical cells in the hyperplastic nodules, the possibility of transplantation of some nodules, the irreversibility of some morphological and biochemical lesions in these allows to designate hyperplastic nodules as a neoplasm. Enzyme and isozyme patterns in hyperplastic vesicles, the appearance of alpha-fetoprotein in these, and some other metabolic findings suggest biochemical disdifferentiation occurring in the vesicles. These findings suggest that cells of hyperplastic nodules are intermediate between normal and malignant cells in the course of neoplastic transformation.
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