Fig. 2

Receiver operating characteristic (ROC) curves illustrating the relative predict power of these factors. And SARE seems to be a better predictor for symptomatic radiation-induced pneumonitis (SRP) with areas under the curve (AUC) values of 0.778, P <0.001. Besides that, MED, AUC=0.641 P=0.019; IL-MLD: AUC=0.610 P=0.067; Abbreviations: SARE: severe acute radiation-induced esophagitis; TLMLD:total mean lung dose; ILMLD: ipsilateral mean lung dose; MED: mean esophagus dose; TIME: the time that pneumonia symptoms appear