ROC curve analysis of value of Dtumor on 99mTc-MAA planar, SPECT / CT in prediction of response 14 Comment: The ROC curve graph shows that the predictive value of Dtumor's tumor response on SPECT / CT (solid line) is the highest with the area under the ROC curve of 0.838; 95% confidence interval: 0.701 - 0.975 with p = 0.01.