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This article shows the major impact the extent of resection of the tumor has on survival for glioblastoma. In particular, if all of the contrast enhancing tumor is removed at surgery, the chance of 2 year survival jumps to 40%, compared with just 7.7 for a near total resection - which is defined as less than 1 cubic cm of tumor remaining. This is why it is so urgent to seek out the best surgeons and facilities. They have a better chance of removing all of the tumor, usually with less damage than the typical surgeon. The ABTA has a list of the best centers at https://www.abta.org/about-brain-tumors/treatments-side-effects/find-a-brain-tumor-center/