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Original Article
Volume 344:783-792 March 15, 2001 Number 11
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Use of Chemotherapy plus a Monoclonal Antibody against HER2 for Metastatic Breast Cancer That Overexpresses HER2
Dennis J. Slamon, M.D., Ph.D., Brian Leyland-Jones, M.D., Steven Shak, M.D., Hank Fuchs, M.D., Virginia Paton, Pharm.D., Alex Bajamonde, Ph.D., Thomas Fleming, Ph.D., Wolfgang Eiermann, M.D., Janet Wolter, M.D., Mark Pegram, M.D., Jose Baselga, M.D., and Larry Norton, M.D.

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 by Eisenhauer, E. A.

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ABSTRACT

Background The HER2 gene, which encodes the growth factor receptor HER2, is amplified and HER2 is overexpressed in 25 to 30 percent of breast cancers, increasing the aggressiveness of the tumor.

Methods We evaluated the efficacy and safety of trastuzumab, a recombinant monoclonal antibody against HER2, in women with metastatic breast cancer that overexpressed HER2. We randomly assigned 234 patients to receive standard chemotherapy alone and 235 patients to receive standard chemotherapy plus trastuzumab. Patients who had not previously received adjuvant (postoperative) therapy with an anthracycline were treated with doxorubicin (or epirubicin in the case of 36 women) and cyclophosphamide with (143 women) or without trastuzumab (138 women). Patients who had previously received adjuvant anthracycline were treated with paclitaxel alone (96 women) or paclitaxel with trastuzumab (92 women).

Results The addition of trastuzumab to chemotherapy was associated with a longer time to disease progression (median, 7.4 vs. 4.6 months; P<0.001), a higher rate of objective response (50 percent vs. 32 percent, P<0.001), a longer duration of response (median, 9.1 vs. 6.1 months; P<0.001), a lower rate of death at 1 year (22 percent vs. 33 percent, P=0.008), longer survival (median survival, 25.1 vs. 20.3 months; P=0.046), and a 20 percent reduction in the risk of death. The most important adverse event was cardiac dysfunction, which occurred in 27 percent of the group given an anthracycline, cyclophosphamide, and trastuzumab; 8 percent of the group given an anthracycline and cyclophosphamide alone; 13 percent of the group given paclitaxel and trastuzumab; and 1 percent of the group given paclitaxel alone. Although the cardiotoxicity was potentially severe and, in some cases, life-threatening, the symptoms generally improved with standard medical management.

Conclusions Trastuzumab increases the clinical benefit of first-line chemotherapy in metastatic breast cancer that overexpresses HER2.


Source Information

From the Division of Hematology and Oncology, UCLA School of Medicine, Los Angeles (D.J.S., M.P.); the Department of Oncology, McGill University, Montreal (B.L.-J.): Medical Affairs, Genentech, South San Francisco, Calif. (S.S., V.P., A.B.); IntraBiotics, Mountain View, Calif. (H.F.); the Department of Biostatistics, University of Washington, Seattle (T.F.); the Department of Obstetrics and Gynecology, Frauenklinik vom Roten Kreuz, Munich, Germany (W.E.); the Department of Oncology, Rush–Presbyterian–St. Luke's Medical Center, Chicago (J.W.); the Department of Oncology, Hospital General Universitari Vall d'Hebron, Barcelona, Spain (J.B.); and the Department of Medical Oncology, Memorial Sloan-Kettering Cancer Center, New York (L.N.).

Address reprint requests to Dr. Slamon at UCLA School of Medicine, Division of Hematology/Oncology, 11-244 Factor Bldg., 10833 Le Conte, Los Angeles, CA 90095-1678, or at dslamon{at}mednet.ucla.edu.

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