Abstract
Combining lapatinib and trastuzumab with taxane chemotherapy may offer clinical benefit to patients with cancer. Dose-limiting toxicities, safety, and tolerability of this combination was assessed. Of the triplet combinations tested, the cohort receiving 750 mg/day dose of lapatinib had the lowest incidence of diarrhea; therefore, this dose should be used in further studies on the treatment of metastatic breast cancer.