The best known of these is the drug trastuzumab (herceptin).

BBC: Q&A: Breast screening

The results were shown in the first randomized phase II study comparing trastuzumab-DM1 (T-DM1) to Herceptin (trastuzumab) plus chemotherapy (docetaxel), the current standard of care for first line HER2-positive metastatic breast cancer.

FORBES: Novartis Deal Bolsters Immunogen

Targeted therapies include trastuzumab (Herceptin) or lapatinib (Tykerb).

CNN: Recurrent breast cancer