Tumor volumes and treatment effects on the tumors and time lengths between acquisitions as well as survival length.

Tumor volumes before bevacizumab treatment as well as relative changes in the Gd-enhancement, edema, and necrosis, between baseline MRI and the one acquired about 2–3 months after the treatment, calculated by (V1−V2)/V1, length of time between two image acquisitions, and survival times of the patients.(*:tumors without necrosis or those with minimal adjacency of Gd-enhanced and necrotic areas).