© 2002 by Oxford University Press
Journal of the National Cancer Institute, Vol. 94, No. 15, 1143-1150,
August 7, 2002
© 2002 Oxford University Press
ARTICLE |
Randomized Trial of Breast Irradiation Schedules After Lumpectomy for Women With Lymph Node-Negative Breast Cancer
Affiliations of authors: T. Whelan, M. Levine, McMaster University, and Cancer Care Ontario (CCO) Hamilton Regional Cancer Centre, Hamilton, Ontario; R. MacKenzie, CCO Toronto Sunnybrook Regional Cancer Centre, Toronto, Ontario; J. Julian, B. Szechtman, McMaster University, Hamilton, Ontario; W. Shelley, CCO Kingston Regional Cancer Centre, Kingston, Ontario; L. Grimard, CCO Ottawa Regional Cancer Centre, Ottawa, Ontario; B. Lada, CCO Northeastern Ontario Regional Cancer Centre, Sudbury, Ontario; H. Lukka, CCO Hamilton Regional Cancer Centre; F. Perera, CCO London Regional Cancer Centre, London, Ontario; A. Fyles, Princess Margaret Hospital, Toronto, Ontario; E. Laukkanen, CCO Windsor Regional Cancer Centre, Windsor, Ontario; S. Gulavita, CCO Northwestern Ontario Regional Cancer Centre; V. Benk, McGill University, Montreal, Quebec, Canada.
Correspondence to: Timothy Whelan, B.M., B.Ch., M.Sc., Hamilton Regional Cancer Centre, 699 Concession St., Hamilton, ON L8V 5C2, Canada (e-mail: tim.whelan{at}hrcc.on.ca).
Background: Breast irradiation after lumpectomy is an integral component of breast-conserving therapy that reduces the local recurrence of breast cancer. Because an optimal fractionation schedule (radiation dose given in a specified number of fractions or treatment sessions over a defined time) for breast irradiation has not been uniformly accepted, we examined whether a 22-day fractionation schedule was as effective as the more traditional 35-day schedule in reducing recurrence. Methods: Women with invasive breast cancer who were treated by lumpectomy and had pathologically clear resection margins and negative axillary lymph nodes were randomly assigned to receive whole breast irradiation of 42.5 Gy in 16 fractions over 22 days (short arm) or whole breast irradiation of 50 Gy in 25 fractions over 35 days (long arm). The primary outcome was local recurrence of invasive breast cancer in the treated breast. Secondary outcomes included cosmetic outcome, assessed with the European Organisation for Research and Treatment of Cancer (EORTC) Cosmetic Rating System. All statistical tests were two-sided. Results: From April 1993 through September 1996, 1234 women were randomly assigned to treatment, 622 to the short arm and 612 to the long arm. Median follow-up was 69 months. Five-year local recurrence-free survival was 97.2% in the short arm and 96.8% in the long arm (absolute difference = 0.4%, 95% confidence interval [CI] = –1.5% to 2.4%). No difference in disease-free or overall survival rates was detected between study arms. The percentage of patients with an excellent or good global cosmetic outcome at 3 years was 76.8% in the short arm and 77.0% in the long arm; the corresponding data at 5 years were 76.8% and 77.4%, respectively (absolute difference = –0.6%, 95% CI = –6.5% to 5.5%). Conclusion: The more convenient 22-day fractionation schedule appears to be an acceptable alternative to the 35-day schedule.
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