The I-SPY 2 trial employs a groundbreaking clinical trial model that uses genetic or biological markers (“biomarkers”) from individual patients’ tumors to screen promising new treatments, identifying which treatments are most effective in specific types of patients. In addition, an innovative adaptive trial design will enable researchers to use early data from one set of patients to guide decisions about which treatments might be more useful for patients later in the trial, and eliminate ineffective treatments more quickly. The large-scale trial involves a unique collaboration by scientists from the National Cancer Institute (NCI), FDA, and nearly 20 major cancer research centers across the country. Study results will be made broadly available to the entire cancer research and development community.