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The 5-year rates of local-regional control were as follows: I, 100%; II, 100%; III, 83%; IVA, 64%; and IVB, 65%. Multivariate analysis revealed that the following parameters significantly affect the probability of this end point: T stage (P = .0001), overall treatment time (P = .0001), overall stage (P = .0131), and addition of a neck dissection (P = .0021). The rates of absolute and cause-specific survival at 5 years were as follows: I, 50% and 100%; II, 81% and 100%; III, 65% and 76%; IVA, 42% and 56%; and IVB, 44% and 52%. Severe radiation complications developed in eight patients (4%). <\/jats:p><jats:p> CONCLUSION: The likelihood of cure after external-beam irradiation was related to stage, overall treatment time, and addition of a planned neck dissection. 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