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This prospective study aims to determine the overall health-related quality of life (HRQoL), functioning, fatigue, and psychological distress preoperatively in patients with suspected diffuse low-grade glioma (dLGG). We were particularly interested if these parameters differed by molecular tumor subtypes: oligodendroglioma, IDH mut astrocytoma and IDH wt astrocytoma. Fifty-one patients answered self-assessed questionnaires prior to operation (median age 51 years; range 19-75; 19 females [37%]). Thirty-five (69%) patients had IDH -mutated tumors, of which 17 were 1p/19q codeleted (i.e., oligodendroglioma) and 18 non-1p/19q codeleted (i.e., IDH mut astrocytoma). A lower overall generic HRQoL was associated with a high level of fatigue (r s = -0.49, p &lt; 0.001), visual disorder (r s = -0.5, p &lt; 0.001), motor dysfunction (r s = -0.51, p &lt; 0.001), depression (r s = -0.54, p &lt; 0.001), and reduced functioning. Nearly half of the patients reported high fatigue (23 out of 51 patients) and anxiety (26/51 patients). Patients with IDH wt had worse generic HRQoL, worse functioning, and more severe fatigue, though differences were not statistically significant between the molecular subtypes. In conclusion, fatigue and anxiety are prominent self-assessed symptoms of patients with suspected dLGG in a preoperative setting, but do not seem to be a reliable method to make assumptions of underlying biology or guide treatment decisions.

Preoperative Patient-Reported Outcomes in Suspected Low-Grade Glioma: Markers of Disease Severity and Correlations with Molecular Subtypes