The breast cancer working group presentation was divided into three sections: the epidemiology, pathology and treatment of breast cancer por Toi, M., Ohashi, Y., Seow, A., Moriya, T., Tse, G., Sasano, H., Park, B.W., Chow, L.W.C., Laudico, A.V., Yip, C.H., Ueno, E., Ishiguro, H., Bando, H.