 Sorafenib is a new type of anti-cancer drug. It belongs to a new class of medications known as tyrosine kinase inhibitors. Sorafenib is thought to work against cancer in many ways. It helps decrease blood supply to the tumor. It also blocks some proteins that help the tumor cells to grow. Sorafenib is approved by the Food and Drug administration FDA for treatment for other cancers like liver and kidney cancer. Sorafenib has also been studied in the treatment of breast cancer that has spread but is not specifically approved for the treatment of breast cancer. It has been studied both as a single agent and also in combination with other anti-cancer therapies for breast cancer. In laboratory models and in some patients with other cancers, sorafenib has been studied in tumors in the brain. 