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A correction has been published: N Engl J Med 1994;331(2):139.

Original Article
Volume 330:1253-1259 May 5, 1994 Number 18
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Dose and Dose Intensity of Adjuvant Chemotherapy for Stage II, Node-Positive Breast Carcinoma
William C. Wood, Daniel R. Budman, Ann H. Korzun, M. Robert Cooper, Jerry Younger, Ronald D. Hart, Anne Moore, John A. Ellerton, Larry Norton, Carolyn R. Ferree, Anita Colangelo Ballow, Emil Frei, and I. Craig Henderson

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ABSTRACT

Background Adjuvant chemotherapy is widely used for breast cancer and is known to extend survival. Some clinicians seek a greater survival benefit by increasing the intensity of the dose, whereas others lower it to diminish toxicity.

Methods The Cancer and Leukemia Group B (CALGB) conducted a randomized trial of different levels of doses and dose intensity (dose per unit of time) of adjuvant chemotherapy in 1572 women with node-positive, stage II breast cancer who were assigned to three treatment groups. One group received 400 mg of cyclophosphamide per square meter of body-surface area and 40 mg of doxorubicin per square meter once every 28 days and 400 mg of fluorouracil per square meter twice every 28 days, for six cycles. Another group received 50 percent higher doses of the three drugs (600 mg, 60 mg, and 600 mg, respectively) but for only four cycles, so that the total dose was identical in these two groups but the dose intensity was higher in the second. The third group of women received half the total dose used in the other two groups and at half the dose intensity used in the second group.

Results After a median of 3.4 years of follow-up, the women treated with a high or moderate dose intensity had significantly longer disease-free survival (P<0.001) and overall survival (P = 0.004) than those treated with a low dose intensity, in three-way log-rank comparisons. However, the difference in survival between the two groups treated with a moderate or high dose intensity was not significant. These results are consistent with either a dose-response effect or a threshold level of the dose or dose intensity.

Conclusions The doses of chemotherapy used to treat breast cancer, especially early breast cancer, should not be reduced if the maximal benefit is to be achieved. .


Source Information

From the Winship Cancer Center, Emory University, Atlanta (W.C.W.); North Shore University Hospital, Manhassett, N.Y. (D.R.B.); the Department of Biostatistics, Harvard School of Public Health, Boston (A.H.K.); the Bowman Gray School of Medicine, Winston-Salem, N.C. (M.R.C., C.R.F.); Massachusetts General Hospital, Boston (J.Y.); St. Luke's Medical Center, Milwaukee (R.D.H.); New York Hospital and Cornell Medical Center, New York (A.M.); the S. Nevada Cancer Research Foundation, Las Vegas (J.A.E.); the Memorial Sloan-Kettering Cancer Center, New York (L.N.); the Frontier Science Technology and Research Foundation, Amherst, N.Y. (A.C.B.); the Dana-Farber Cancer Institute, Boston (E.F.); and the University of California, San Francisco, School of Medicine, San Francisco (I.C.H.).

Address reprint requests to Dr. Wood at the Department of Surgery, Emory University School of Medicine, 1364 Clifton Rd., N.E., Atlanta, GA 30322.

Full Text of this Article


Related Letters:

Adjuvant Therapy for Breast Cancer
Muller H.-J., Gleiter C. H., Gundert-Remy U., Melnychuk D., Panasci L. C., Coppin C. M.L., Goldie J. H., Sauter C., Garey J., Lehrer S., Farkas D. H., Umek R. M., Morrison B. W., Atkins C. D., Wood W. C., Budman D., Henderson I. C., Muss H. B., Thor A. D., Berry D. A., Goldhirsch A., Gelber R. D.
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