Fig. 1. Receiver operating characteristic (ROC) curves to identify optimal cutoff value of maximum distance (distance_max) from primary extra nodal site to the farthest lymph node, and maximum standard uptake value (SUV_max) in patients with limited stage upper aerodigestive tract natural killer/T cell lymphoma. The calculated optimal cutoffs for distance_max and SUV_max were 10.8 and 7.1 respectively. In addition, the area under the ROC curve (AUC) values for distance_max and SUV_max were 0.874 and 0.632, respectively. The AUC value for distance_max was significantly higher than that for SUV_max (P<0.001).

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