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Receiver operating characteristic (ROC) curve showing (A) optimal post-SBRT NLR value predicting overall survival and (B) Kaplan-Meier curve showing overall survival stratified by post-SBRT NLR of 3.2. Intersection of yellow line and ROC curve in Fig. 1A corresponds to the optimal NLR cut-off value of 3.2. SBRT, stereotactic body radiation therapy; NLR, neutrophil to lymphocyte ratio.
