Pilot, phase II, parallel-group, open-label, noncomparative, prospective, multicenter study designed to evaluate the progression-free survival of docetaxel and bevacizumab ± trastuzumab for the first-line treatment of participants with metastatic breast cancer. Participants were stratified according to human epidermal growth factor receptor-2 (HER2) status at the time of enrollment. HER2 negative participants were assigned to receive docetaxel and bevacizumab (DB). HER2 positive participants were assigned to receive docetaxel, bevacizumab, and trastuzumab (DBT).