[WHO classification of tumors of the breast, 2012].

The classification of tumors of the breast was revised and considerably modified in 2012. The main modifications were applied to epithelial tumors. The clinical types of breast cancer were identified. These were inflammatory and bilateral carcinomas. No substantial amendments were made in the classification of mesenchymal tumors. This paper discusses the new WHO classification of tumors of the breast, 2012, by describing the histological forms and immunohistochemical profile of neoplasms in detail. Its dissimilarities from the previous edition are given. The systems for evaluating medical pathomorphism are detailed.