Dr. VK Gadi is an oncologist who specializes in the treatment of breast cancer. In this video, Dr. Gadi explains how biologic or targeted therapies are designed to to go after specific vulnerabilities that are unique to the cancer. One therapy that Dr. Gadi is particularly excited about is the use of Herceptin for patients who have HER2-positive breast cancer. Herceptin is an monoclonal antibody which binds to the HER2 protein on the outside of a cancer cell. Once bound, it initiates a series of events that lead to the destruction of the cancer cell.