Fig 2. The relationship between maximum rCBV values and survival time in 49 patients with high-grade astrocytoma. A cutoff value of 2.3 for maximum rCBV (dotted line) was determined on the basis of an ROC analysis result to best discriminate patients with and without 2-year survival. indicates surviving patients with AA; •, patients with AA who died; , surviving patients with GBM; , patients with GBM who died.