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10-Year Results After Sector Resection With or Without Postoperative Radiotherapy for Stage I Breast Cancer: A Randomized Trial

From the Department of Surgery, Örebro Medical Center Hospital, Örebro; Departments of Surgery, Oncology, and Pathology, University Hospital, Uppsala; Departments of Pathology and Mammography, Falu Hospital, Falun; Department of Medical Epidemiology, Karolinska Institute, Stockholm, Sweden; and the Department of Epidemiology and Harvard Center for Cancer Prevention, Harvard School of Public Health, Boston, MA.

Address reprint requests to Göran Liljegren, MD, PhD, Department of Surgery, Örebro Medical Center Hospital, S-701 85 Örebro, Sweden; email goran.liljegren{at}orebroll.se

PURPOSE: To study the long-term effectiveness of postoperative radiotherapy after sector resection for breast cancer in a randomized trial in which mammography is a major pathway to diagnosis.

PATIENTS AND METHODS: Three hundred eighty-one women with a unifocal breast cancer 20 mm in diameter on the preoperative mammogram and without histopathologic signs of axillary metastases were treated by sector resection plus axillary dissection. Of these patients, 184 women were randomized to receive postoperative radiotherapy to the breast (XRT group), and 197 women received no further treatment (non-XRT group).

RESULTS: The local recurrence rate was 8.5% (95% confidence interval [CI], 3.9% to 13.1%) in the XRT group and 24.0% (95% CI, 17.6% to 30.4%) in the non-XRT group (P = .0001). Survival free from regional and distant recurrence was 83.3% in the XRT group (95% CI, 77.5% to 89.1%) and 80.0% in the non-XRT group (95% CI, 73.9% to 86.1%) (P = .23). Overall survival was 77.5% in the XRT group (95% CI, 70.9% to 84.1%) and 78% in the non-XRT group (95% CI, 71.7% to 84.3%) (P = .99). A subgroup analysis suggested that women older than 55 years of age without comedo or lobular carcinomas had a low risk of local recurrence of 6.1% (95% CI, 0.1% to 9.1%) in the XRT-group and 11.0% (4.0% to 18.0%) in the non-XRT group (P = .16).

CONCLUSION: Sector resection plus radiotherapy resulted in an absolute reduction in local recurrence of 16% at 10 years compared with surgery alone. Women older than 55 years of age without comedo or lobular carcinomas may have a low risk of local recurrence. Postoperative radiotherapy was not shown to reduce distant recurrences or improve overall survival.

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