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Disease-free survivals according to a combination of independent prognostic factors (MTV2.5 and LNR): Combination 0, MTV2.5 < 4.5 AND LNR < 0.08; Combination1, MTV2.5 < 4.5 AND LNR≥0.08,n MTV2.5 ≥ 4.5 AND LRN < 0.08; Combination 2, MTV2.5 ≥ 4.5 AND LNR ≥0.08. LNR = lymph node ratio, MTV = metabolic tumor volume.
