Based on the specific characteristics of your cancer, your doctor may recommend to you a few targeted therapies that may be effective for you. Here is a brief description of 5 currently common therapies. 1. Herceptin: works against HER2-positive breast cancers by blocking the ability of the cancer cells to receive chemical signals that tell the cells to grow. 2. Tykerb: works against HER2-positive breast cancers by blocking certain proteins that can cause uncontrolled cell growth. 3. Perjeta: works against HER2-positive breast cancers by blocking the cancer cells’ ability to receive growth signals. 4. Afinitor: works against hormone-receptor-positive breast cancers that have stopped responding to Arimidex or Femara by stopping the cancer cells from getting the energy they need. 5. Kadcyla: a combination of Herceptin and the chemotherapy medicine emtansine. Herceptin effectively carries the emtansine to the cancer cells, and keeps the chemotherapy from affecting the surrounding healthy cells as much as it usually would.