At a median follow-up of 10.9 years, an EORTC study has shown that irradiation of regional nodes in patients with stage I, II, or III breast cancer has a marginal effect on overall survival, the primary endpoint (at 10 years, overall survival was 82.3 % for regional irradiation versus 80.7% for no regional irradiation, (HR=0.87 (95%CI: 0.76, 1.00), p=0.06).
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