Use of chemotherapy plus a monoclonal antibody against HER2 for metastatic breast cancer that overexpresses HER2 - Slamon, DJ; Leyland-Jones, B; Shak, S; Fuchs, H; Paton, V; Bajamonde, A; Fleming, T; Eiermann, W; Wolter, J; Pegram, M; Baselga, J; Norton, L (N Engl J Med, 2001)