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Breast Cancer

Lapatinib: Current Status and Future Directions in Breast Cancer

Massachusetts General Hospital Cancer Center, Boston, Massachusetts, USA

Key Words. Lapatinib • GW572016 • Dual tyrosine kinase inhibitor • Breast cancer • EGFR • ErbB-1 • ErbB-2 • HER-2

Correspondence: Paul E. Goss, M.D., Ph.D., Massachusetts General Hospital Cancer Center, Gillette Center for Women’s Cancers, 55 Fruit Street, Lawrence House, LRH 302, Boston, Massachusetts 02114, USA. Telephone: 617-724-3118; Fax: 617-643-0589; e-mail: pgoss{at}partners.org

Lapatinib is an oral receptor tyrosine kinase inhibitor, targeting both the ErbB-1 and ErbB-2 receptors. Pre-clinical in vitro and in vivo models indicate that lapatinib is active as monotherapy, synergistically in combination with trastuzumab, and in trastuzumab-resistant cell lines. Early clinical trials also provide evidence in patients that lapatinib is active against breast cancer. This paper reviews results of phase II and III clinical trials of lapatinib in metastatic breast cancer, evidence for its potential in patients with brain metastases, and current clinical trials as adjuvant treatment in early-stage disease. Our improved understanding of the biology of breast cancer and the use of biomarkers for identification of specific subtypes is allowing us to bring patient-specific novel therapies such as lapatinib to the clinic.

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