hPG80 (Circulating Progastrin) as a Blood Biomarker for High-grade Glial Tumors

Evaluation of plasma hPG80 concentrations by fasting blood samples. A total of seven 5 mL blood samples will be taken: Before radiation therapy; at the end of radiation therapy; at cycle 3 of chemotherapy; at cycle 6 of chemotherapy; 3 months after the end of treatment; 6 months after the end of treatment; and 9 months after the end of treatment.