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Evaluation of progressive hepatic histopathology in long-term tamoxifen therapy.
Pathology, Research and Practice 2018 October 4
Tamoxifen (TAM) therapy is the better treatment for breast cancer and the drug use the prophylaxis of this disease in young premenopausal women. Yet, the effects associated with this therapy are unknown. To better understand the extension of this problem, we developed an animal model to mimic this therapy, aiming to evaluate its potential biochemical and histopathological changes in the liver. Young cycling female rats were treated with TAM for one, two and three months and toxicological biomarkers and liver histomorphometry were evaluated. Starting at two months, TAM-treatment prevented the normal age-dependent increase in body weight, without inducing changes in food intake. Serum levels of cholesterol and of the metabolic enzymes creatine kinase and aspartate aminotransferase were reduced in all TAM treatment periods. Serum levels of the metabolic enzymes alkaline phosphatase and lactate dehydrogenase were increased after the first month but returned to control levels upon 3 months of drug exposition. Moderate microvesicular steatosis, classified only at the first month of TAM treatment, was reduced afterwards. Our model showed an adaptive response of liver upon 3 months of treatment, suggesting that at the stated conditions, TAM will not promote hepatotoxicity. In this way, the present model may be useful in the study of possible key endocrine effects of TAM use and the search for better clinical outcomes.
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