The anterior mediastinal lymph nodes were analyzed morphometrically in rats with chemically provoked breast cancer. Rats with untreated breast cancer and animals receiving chemotherapy demonstrated decreased volumes of paracortical region and lymphoid nodules with the germinal centers accompanied by extended medullary thymic substance. Resection of largest focus of breast tumor improved the filtration barrier potential of anterior mediastinal lymph nodes, up-regulated the proliferative activity of lymphoid cells in T-cell zones, and down-regulated proliferation of plasmatic cells.
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