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Axillary Treatment in Conservative Management of Operable Breast Cancer: Dissection or Radiotherapy? Results of a Randomized Study With 15 Years of Follow-Up

From the Departments of Surgery, Radiotherapy, and Biostatistics, Institut Curie, Paris, France

Address reprint requests to K.B. Clough, MD, Service de Chirurgie, Institut Curie, 25 rue d'Ulm, 75 005 Paris, France; e-mail: christine.louissylvestre{at}chicreteil.fr

PURPOSE: Axillary dissection is the standard management of the axilla in invasive breast carcinoma. This surgery is responsible for functional sequelae and some options are considered, including axillary radiotherapy. In 1992, we published the initial results of a prospective randomized trial comparing lumpectomy plus axillary radiotherapy versus lumpectomy plus axillary dissection. We present an update of this study with a median follow-up of 180 months (range, 12 to 221 months).

PATIENTS AND METHODS: Between 1982 and 1987, 658 patients with a breast carcinoma less than 3 cm in diameter and clinically uninvolved lymph nodes were randomly assigned to axillary dissection or axillary radiotherapy. All patients underwent wide excision of the tumor and breast irradiation.

RESULTS: The two groups were similar for age, tumor-node-metastasis system stage, and presence of hormonal receptors; 21% of the patients in the axillary dissection group were node-positive. Our initial results showed an increased survival rate in the axillary dissection group at 5 years (P = .009). At 10 and 15 years, however, survival rates were identical in both groups (73.8% v 75.5% at 15 years). Recurrences in the axillary node were less frequent in the axillary dissection group at 15 years (1% v 3%; P = .04). There was no difference in recurrence rates in the breast or supraclavicular and distant metastases between the two groups.

CONCLUSION: In early breast cancers with clinically uninvolved lymph nodes, our findings show that long-term survival does not differ after axillary radiotherapy and axillary dissection. The only difference is a better axillary control in the group with axillary dissection.

Authors' disclosures of potential conflicts of interest are found at the end of this article.

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