[Basic ultrastructural cell types of human cancerous breast tumors]

Five main types are distinguished among differentiated (1st Group) and undifferentiated (2nd Group) cells of breast tumor. First Group includes types I, II and III of cells, while the 2nd Group-types IV and V. Type I has organ-specific features and a cytoplasm rich in organelles. Type II is characterized by organ-specific features and a cytoplasm. with a small amount of organelles. Type III is represented by myoepithelial cells. The cancer cells of the 2nd Group do not contain organ-specific features but they can be rich (type IV) or poor (type V) in organelles. All live types of cells can have the features of epithelial tissue and can be "light" or "dark". Such typing of cancer cells facilitates the differential diagnosis of breast carcinoma.