Figure 2.

(A) Box-and-whisker plots representing tumor volume of an asymptomatic group and symptomatic group. The median tumor volume of the asymptomatic group and the symptomatic group were 5.0 ml and 45.7 ml, respectively. P-value for the Mann-Whitney U test: <0.001. (B) Receiver operating characteristic curve for predicting which patients will become symptomatic via tumor volume. Area under the curve: 0.919 (95% confidence interval: 0.887–0.951). Threshold for tumor volume: 21.1 ml. Sensitivity: 0.843. Specificity: 0.880.