O Metzger Filho1, H J Burstein2. 1. Dana-Farber Cancer Institute, Boston, USA; Brigham & Women's Hospital, Boston, USA; Harvard Medical School, Boston, USA. 2. Dana-Farber Cancer Institute, Boston, USA; Brigham & Women's Hospital, Boston, USA; Harvard Medical School, Boston, USA. Electronic address: hal_burstein@dfci.harvard.edu.