Health-related quality of life for glioblastoma short and long-term survivors receiving treatment with TTfields.

2055 Background: The aim of this study was to administer the first large-scale, international survey eliciting real-world patient-reported quality-of-life (QoL) for patients with newly diagnosed and long-term glioblastoma (GBM) currently receiving treatment with TTFields. Methods: A survey was designed and mailed to 2,815 patients actively using TTFields for treatment of GBM in the United States (US, n = 2,182) and Europe (EU, n = 633). The survey included 1) demographic information, 2) patient-reported clinical information and 3) EuroQol’s EQ-5D-5L and EQ visual analogue scale (EQ-VAS) surveys. Univariate and multivariate analyses were performed on five dimensions (mobility, self-care, usual activity, pain/discomfort, anxiety/depression) of the EQ-5D-5L and EQ-VAS to understand the impact of patient demographics and clinical characteristics on QOL. Results: A total of 1,106 patients were included (39.3% response rate) with 782 and 324 responses in the US and EU, respectively. The median time from diagnosis was 14 mos (range, 0-301 mos) and ≥24 mos in 28.4% of patients. Patients were mostly male (62.3%) with a mean age of 58.5 (SD = 12.5) and 69.3% had stable disease. Mean EQ-VAS was 68.2 for all patients and was significantly higher for those with > 15 months since diagnosis compared to < 15 months since diagnosis (p = 0.008). There were significantly fewer problems reported on self-care ( p = 0.04) and usual activity ( p = 0.007) in patients with a longer time since diagnosis in the univariate analysis. In the multivariate analysis, patients with a longer time since diagnosis reported significantly better EQ-VAS ( p = 0.04). The effect size in the multivariate analysis for time since diagnosis on EQ-VAS was higher in the progressed subgroup ( p = 0.17) compared to the broader sample (0.08). The EQ-VAS and all five dimensions including mobility, self-care, usual activity, pain/discomfort, and anxiety/depression were improved for stable patients compared to progressed patients in the univariate and multivariate analyses. However, when stratified by progression status, progressed patients with longer time from diagnosis had significantly fewer reported problems with mobility ( p = 0.04), self-care ( p = 0.004) and usual activity ( p = 0.008), and significantly better self-rated health status ( p = 0.02). Conclusions: GBM survivors receiving TTFields reported significantly improved health status over time since diagnosis. Long-term survival with TTFields does not have a detriment in patient reported quality of life, in fact with longer time from diagnosis QOL significantly improves. This is true for patients with stable and progressed disease. Future prospective clinical trials are needed to further study the impact of our treatment and tumor progression on patient QOL.