This prospective multicenter non-interventional study (NIS) aims at confirming the survival benefit of Optune Gio® - in terms of OS and PFS - and describing device usage (compliance will be measured through patient's usage report, recorded by each device) and impact on QoL, in a real-life setting in France, in a large cohort of participants with newly diagnosed GBM who completed radiotherapy and concomitant TMZ after surgery and initiatingtreatment with Optune Gio® device together with maintenance TMZ.

A special emphasis will be given to the evaluation of QoL and the impact of Optune Gio® on daily life, considering the limited life expectancy of these patients, the symptom burden and significant disease-related disability.

GBM is one of the most common malignant primary brain tumor in adults with an overall incidence in Europe and in France of approximately 3/100,000. In France, 2,233 patients were estimated to be diagnosed with histologically-confirmed GBM in France in 2020. GBM are particularly aggressive and treatment resistant, with a 5-year overall survival (OS) of only 7.0 % in France. Since 2005, standard treatment for newly diagnosed GBM consists of maximal feasible surgical resection or biopsy followed by standard brain radiation therapy with concomitant temozolomide (TMZ) and a further 6 cycles of TMZ alone (Stupp protocol). This treatment demonstrated a significant increase in median OS compared to surgery and radiotherapy alone (14.6 vs 12.1 months).

Since 2005, despite several of phase III clinical trials conducted, TTFields treatment was the first to report a significant improvement in GBM patients' survival compared to the previous standard of care. This pivotal phase III clinical trial randomized 695 patients with newly diagnosed GBM receiving either TTFields plus maintenance TMZ or TMZ alone, after completion of standard radiochemotherapy. Adding TTFields to maintenance TMZ significantly improved median progression-free survival (PFS) and median OS compared to TMZ alone. Impact of TTFields on survival appeared comparable to that achieved by the addition of TMZ to radiotherapy.

These results led to FDA approval of Optune Gio® and to CE mark in the European Union in association with maintenance TMZ in patients with newly diagnosed GBM, after surgery and radiotherapy with adjuvant TMZ. Optune Gio® obtained national reimbursement in several European countries in this indication, as Germany, Switzerland, Sweden and France. The National Commission for the Evaluation of Medical Devices and Health Technologies (CNEDiMTS) issued on 20 July 2021 a positive opinion to Optune Gio® for inclusion into the reimbursement list in the following indication: "in association with maintenance TMZ, after surgery and radiochemotherapy in patients with newly diagnosed GBM, as part of a shared decision between the patient and the medical team".

This prospective multicenter non-interventional study (NIS) aims at confirming the survival benefit of Optune Gio® - in terms of OS and PFS - and describing device usage (compliance will be measured through patient's usage report, recorded by each device) and impact on QoL, in a real-life setting in France, in a large cohort of participants with newly diagnosed GBM who completed radiotherapy and concomitant TMZ after surgery and initiating treatment with Optune Gio® device together with maintenance TMZ.

A special emphasis will be given to the evaluation of QoL and the impact of Optune Gio® on daily life, considering the limited life expectancy of these patients, the symptom burden and significant disease-related disability.

Inclusion Criteria:

• Participant aged ≥ 18 years old.
• Participant with newly diagnosed GBM.
• Participant who completed radiochemotherapy after surgery or biopsy.
• Participant within first 2 cycles of maintenance TMZ.
• Participant for whom the physician has decided to initiate treatment with Optune® according to Instruction For Use or medical guidelines.

Exclusion Criteria:

• Participant currently participating in a prospective clinical trial studying a different treatment than the one studied in this current prospective study.
• Patient currently breastfeeding.
• Patient who is pregnant, thinks she might be pregnant or is trying to become pregnant. Patient of childbearing potential must use a contraceptive method for the whole duration of their participation in the study.
• Patient suffering from a significant neurological disease (primary epilepsy, dementia, progressive degenerative neurological disorder, meningitis or encephalitis, hydrocephalus associated with increased intracranial pressure).
• Patient with a known sensitivity to conductive hydrogels, such as gel used with electrocardiogram (ECG) or transcutaneous electrical nerve stimulation (TENS) electrodes.
• Patient with an active implanted medical device, a cranial defect (such as a missing bone that has not been replaced) or bullet fragments. Active electronic devices include, for example, deep brain stimulators, spinal cord stimulators, vagus nerve stimulators, pacemakers and defibrillators.
• Participant being deprived of liberty by a judicial or administrative decision, or who is under a measure of legal protection (e.g. guardianship or curatorship).

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