Breast cancer is one of the most common oncological diseases in women, and its morphological changes during the disease are of great importance. The study observed the cessation of growth and proliferation, apoptosis processes, as well as changes in the structure of cells, the morphological spectrum of breast tumors, cell size and nuclear shape during chemotherapy. Morphological changes occurring in organs, tissues, cells and subcellular organelles after chemotherapy were analyzed. In particular, it was found that the inflammatory process in atypical cells significantly decreased. The studied changes play an important role in determining the effectiveness of treatment and serve as a basis for future treatment strategies.

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