This non-interventional study aims to investigate change over time in cognitive function, sleep quality, and activity in daily life as important determinants of QoL in a large cohort of GBM patients in Germany treated with TTFields in routine clinical care using low-threshold, electronic PRO and modern automated tracking data analyses. The gained results will allow even better understanding of TTFields therapy in daily life of GBM patients and consequently, better informing patients about what to expect when starting this therapy, increasing therapy compliance in the long-term.

Glioblastoma (GBM) is the most common malignant primary tumor of the brain with an annual incidence of approximately 3/100.000. Since 2005 the treatment for newly diagnosed GBM consisted of maximal surgical resection, approx. 60 Gy of radiotherapy together with chemotherapy using temozolomide (TMZ), followed by 6 cycles of maintenance chemotherapy. This treatment regimen demonstrated increased median overall survival (OS) from 12.1 to 14.6 months in comparison to surgery and radiotherapy alone in 2005.

Since 2005, despite plenty of clinical phase III trials conducted, Tumor Treating Fields (TTFields) therapy was the first treatment shown to significantly increase median progression-free survival (PFS), OS and one to five year survival rates compared to the previous standard of care. These results led to FDA approval of TTFields for newly diagnosed GBM and were acknowledged since then by several guidelines recommending TTFields for GBM therapy (e.g. NCCN guidelines for CNS cancers V.1.2018, RCC guideline tumörer I hjärna och ryggmärg 2020-01-14 V3.0, DGHO guideline for glioma in adults ICD-10 C71 March 2019). Today, several national committees in Europe already list TTFields as reimbursed treatment (e.g. Austria, Sweden, Germany).

Data with TTFields therapy in real-world setting is limited and therefore further evaluation of different treatment aspects of TTFields therapy in clinical routine are of interest. In particular the QoL-related aspects neurocognitive functioning, daily activity and sleep quality in this patient cohort is of major interest, given the limited life expectancy with this disease.

This non-interventional study aims to investigate change over time in neurocognitive functioning, sleep quality, and activity in daily life as important determinants of QoL in a large cohort of GBM patients in Germany treated with TTFields in routine clinical care using low-threshold, electronic PRO and modern automated tracking data analyses. The gained results will allow even better understanding of TTFields therapy in daily life of GBM patients and consequently, better informing patients about what to expect when starting this therapy, increasing therapy compliance even further in the long-term.

Inclusion Criteria:

• min.18 years of age
• Newly diagnosed, histologically confirmed GBM
• Patient after completion of radiochemotherapy but within first 3 cycles of first-line tumor-specific maintenance chemotherapy
• Clinical indication of treatment with NovoTTF-200A System (Optune®) according to IFU and medical guidelines
• Signed informed consent

Exclusion Criteria:

Any foreseeable deviation from the IFU of NovoTTF-200T Device

Patients with newly diagnosed, histologically confirmed GBM and an indication for treatment with NovoTTF-200A System (Optune®) according to IFU and medical guidelines will be enrolled. Patients' written informed consent to use their routine clinical data and app-based monitoring data according to data privacy standards must be obtained prior to documentation of patients' data in the e-CRF.