New analysis of data from the EMILIA trial showed that ado-trastuzumab emtansine improved overall survival compared with lapatinib plus capecitabine in patients with HER2-positive unresectable, locally advanced or metastatic breast cancer previously treated with trastuzumab and a taxane.
There is great heterogeneity in both the presentation and prognosis of metastatic breast cancer.
Multigene expression panels are being evaluated to determine which women with early stage breast cancer are more likely to develop metastatic disease.
Decisions on whether or not to treat a patient with metastatic breast cancer and the aggressiveness of treatment must be individualized, based on patient prognosis, tumor characteristics, performance status, and the primary goals of treatment.
Unlike stage I to III breast cancer, the primary goal of treatment in metastatic breast cancer is often to improve quality of life, with extending life a secondary goal.
Breast cancer is considered metastatic breast cancer (MBC) if the disease has spread beyond the breast and ipsilateral lymph nodes (axillary, internal mammary, infra- and supraclavicular). 
Breast Surgery Program
Visiting Professor of Surgery
University of Connecticut School of Medicine
ES declares that he has no competing interests.
Hematology and Oncology
Ellis Fischel Cancer Center
Margaret Proctor Mulligan Assistant Professor of Clinical Medicine
Medical Oncology - Breast Program Director
University of Missouri
PN declares that she has no competing interests.
University of Missouri
Dr Edward Sauter, Dr Puja Nistala, and Dr Donald Doll would like to gratefully acknowledge Dr Carl E. Freter and Dr Michael Perry, the previous contributors to this monograph.
CEF and MP declare that they have no competing interests.
AN declares that he has no competing interests.
Honorary Senior Lecturer in Medical Oncology
South West Wales Cancer Centre
GB has received honoraria for participation in advisory boards (AstraZeneca, Novartis, Pfizer, Roche, GSK, Cephalon, Amgen, Sanofi, Aventis), speaker's fees (AstraZeneca, Novartis, Sanofi, Aventis), and hospitality at conferences (AstraZeneca, Novartis, Pfizer, Roche, Aventis).
Division of Hematology/Oncology
Department of Medicine
University of Alabama at Birmingham
CV declares that University of Alabama at Birmingham has received research support from Pfizer, F. Hoffmann-La Roche, and Incyte.
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