As our knowledge of biomarkers increases, new studies are uncovering promising news on treating breast cancer. This emerging technology is already helping to predict which cancers – and which patients – will respond best to specific drugs. Molecular biologist and oncology expert Dr. Jason Hill summarizes six important studies presented at the 2009 San Antonio Breast Cancer Symposium. All focusing on biomarkers for breast cancer, the studies examined mechanisms of action and novel drug combinations that may unlock breakthroughs in treatment. Dr. Hill discusses the implications and questions that will drive future R&D efforts to develop targeted breast cancer therapies.