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Kaplan–Meier survival curves for overall survival with (A) conventionally fractionated irradiation [50 Gy, 50 Gy plus 6 Gy boost, and 46 Gy (excludes hypofractionated radiotherapy)], log-rank p = 0.002; and (B) concomitant chemotherapy (broken line: 5-fluorouracil–leucovorin–folinic acid; solid line: tegafur–folinic acid), log-rank p = 0.04.
