Patients with HER2-positive advanced or metastatic breast cancer whose disease has progressed following treatment with an anthracycline, a taxane, and trastuzumab (Herceptin, Genentech) will now have a new therapeutic option. Lapatinib (Tykerb, GlaxoSmithKline) has been approved by the FDA for use in combination with capecitabine (Xeloda, Roche) following a priority review.