Breast cancer is a very common disease, in Vietnam, breast cancer ranks first in incidence and third in mortality in women. Breast cancer treatment is a multimodal treatment combining many methods, each stage has different treatment methods to bring the highest treatment effect to the patient.

The World Health Organization (WHO) classification of breast tumors has been published 5 times. In each classification, WHO has rearranged breast adenomas and there are a number of new entities recognized, in the last 2 breast cancer classifications, there are a number of changes including: