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Radiation therapy was the strongest predictor for local relapse in Stage III disease in multivariate analysis. Kaplan-Meier analysis (univariate) showed that patients receiving radiation had 4- and 5-year local relapse-free survival rates of 57% (95% CI, 33%–100%) for both years while patients not receiving radiation had 4- and 5-year local relapse-free survival rates of 21% (95% CI, 7%–64%) and 0% (95% CI not derivable), respectively (log-rank test, p = 0.01).
