FIGURE 6. Kaplan–Meier plot of disease-free survival for patients with MRFDG/flow < median (top line) vs. patients with MRFDG/flow > median (bottom line) shows that patients with higher MRFDG-to-flow ratio have poorer disease-free survival. Probability value for difference in curves by Wilcoxon statistic is 0.09. Probability value for association between survival and MRFDG/flow by Cox proportional hazards model, which takes better advantage of continuous nature of PET data, is 0.05.

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