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A correction has been published: N Engl J Med 2002;346(5):388.

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Volume 345:1378-1387 November 8, 2001 Number 19
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Recurrence Rates after Treatment of Breast Cancer with Standard Radiotherapy with or without Additional Radiation
Harry Bartelink, M.D., Ph.D., Jean-Claude Horiot, M.D., Ph.D., Philip Poortmans, M.D., Henk Struikmans, M.D., Ph.D., Walter Van den Bogaert, M.D., Ph.D., Isabelle Barillot, M.D., Alain Fourquet, M.D., Jacques Borger, M.D., Ph.D., Jos Jager, M.D., Ph.D., Willem Hoogenraad, M.D., Laurence Collette, M.Sc., Marianne Pierart, M.Sc., for the European Organization for Research and Treatment of Cancer Radiotherapy and Breast Cancer Groups

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ABSTRACT

Background Radiotherapy prevents local recurrence of breast cancer after breast-conserving surgery. We evaluated the effect of a supplementary dose of radiation to the tumor bed on the rates of local recurrence among patients who received radiotherapy after breast-conserving surgery for early breast cancer.

Methods After lumpectomy and axillary dissection, patients with stage I or II breast cancer received 50 Gy of radiation to the whole breast in 2-Gy fractions over a five-week period. Patients with a microscopically complete excision were randomly assigned to receive either no further local treatment (2657 patients) or an additional localized dose of 16 Gy, usually given in eight fractions by means of an external electron beam (2661 patients).

Results During a median follow-up period of 5.1 years, local recurrences were observed in 182 of the 2657 patients in the standard-treatment group and 109 of the 2661 patients in the additional-radiation group. The five-year actuarial rates of local recurrence were 7.3 percent (95 percent confidence interval, 6.8 to 7.6 percent) and 4.3 percent (95 percent confidence interval, 3.8 to 4.7 percent), respectively (P<0.001), yielding a hazard ratio for local recurrence of 0.59 (99 percent confidence interval, 0.43 to 0.81) associated with an additional dose. Patients 40 years old or younger benefited most; at five years, their rate of local recurrence was 19.5 percent with standard treatment and 10.2 percent with additional radiation (hazard ratio, 0.46 [99 percent confidence interval, 0.23 to 0.89]; P=0.002). At five years in the age group 41 to 50 years old, no differences were found in rates of metastasis or overall survival (which were 87 and 91 percent, respectively).

Conclusions In patients with early breast cancer who undergo breast-conserving surgery and receive 50 Gy of radiation to the whole breast, an additional dose of 16 Gy of radiation to the tumor bed reduces the risk of local recurrence, especially in patients younger than 50 years of age.


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From the Department of Radiation Oncology, the Netherlands Cancer Institute, Amsterdam (H.B., J.B.); the Department of Radiation Oncology, Dr. Bernard Verbeeten Institute, Tilburg (P.P.); the Department of Radiation Oncology, University Hospital Utrecht, Utrecht (H.S.); the Department of Radiation Oncology, Radiotherapeutisch Institute Limburg, Heerlen (J.J.); and the Department of Radiation Oncology, Joint Center for Radiotherapy Arnhem–Nijmegen, St. Radboud Hospital, Nijmegen (W.H.) — all in the Netherlands; the Department of Radiation Oncology, Centre Georges-François Leclerc, Dijon (J.-C.H., I.B.); and the Department of Radiation Oncology, Institut Curie, Paris (A.F.) — both in France; and the Department of Radiation Oncology, University Hospital Gasthuisberg, Leuven (W.V.B.); and the European Organization for Research and Treatment of Cancer, Brussels (L.C., M.P.) — both in Belgium.

Address reprint requests to Dr. Bartelink at the Department of Radiation Oncology, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands, or at h.bartelink{at}nki.nl.

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