The Effects of CSF of Patients with Glioblastomas on the Microglial Immune Profile

To successfully complete the study the following procedures will be implemented after obtaining informed consent:

1. Serum blood sample acquisition and storage
2. CSF sample acquisition Of all subjects included in the study a CSF sample will be taken. The sampling will be pre-surgical by lumbar puncture. Before the lumbar puncture all patients will undergo brain imaging (CT or MRI), as well as an fundoscopic exam and a blood draw. Through patient history and clinical examination other neurological pathology is discarded (neurological focalization, altered mental status, recent seizures or any other previous or recent neurological pathology). Patients with lumbar puncture contraindications as sampling method will undergo trans-surgical sampling, as initial procedure performed during surgery to avoid contamination. All sampling must be taken before any radio- and/or chemotherapy.
3. Storage of sampled CSF The CSF sample obtained will be minimally 3 mL (3 tubes of 1 mL), in sterile tubes without any type of additives. The sample will be stored at -80 °C.
4. Tumour tissue acquisition and storage Of all subjects included in the study, tumour tissue samples will be obtained from the central zone, posteriorly molecular analysis and identification of coding genes for significant proteins in CSF will be performed with MALDI-TOF.

After obtaining the patient background information and the tissue samples (CSF, tumour and serum) genetic and histological testing will be performed to obtain glioblastoma diagnosis, following current guidelines, the next parameters must be present for definitive glioblastoma diagnosis, and thus inclusion in the study:

1. IDH-Wildtype diffuse and astrocytic glioma in adults

• microvascular proliferation or necrosis OR + TERT promotor mutation OR + EFGR gene amplification OR + +7/-10 chromosome copy number changes. When definitive diagnosis is obtained and inclusion in this study is confirmed there will be programmed follow-up visits at 3, 6, 9 and 12 months, where a previously designed questionnaire similar to the admission questionnaire will be performed to specify patient evolution, and functionality current adjuvant treatment, additionally a full physical exam including neurological exam will be performed, with a radiological imaging study (CT or MRI). In case of decease, this will be closely registered by contacting the patient or family one week before the follow-up appointment to confirm the appointment, in case of deceasement date and cause must be registered.