Glioblastoma Multiforme of the Brain

The goal of this observational study is to identify proteins that can be found in the cerebrospinal fluid (CSF) of patients with grade IV brain tumors, specifically glioblastomas, and correlate these proteins with progression free survival, overall survival and performance status (functionality). All participants with high probability of glioblastoma will initially be included, final inclusion will be dependent on the definitive histopathological diagnosis of the tumor. The main question is: Can the researchers identify a proteomic profile in CSF from study participants with glioblastoma in association with a longer progression free survival? Participants will undergo the following procedures, that do not deviate from normal standard diagnostic care. 1. Lumbar puncture to obtain CSF. 2. Blood draw. 3. Trans-surgical tissue sample of the brain tumor. Additionally participants will be planned for follow up appointments every 3 months following the first 12 months after the surgical tumor resection.