In this longitudinal study, one in five patients with glioma developed clinical depression in the 6 months after starting radiotherapy. Patients with functional impairment or previous depression were at higher risk. MDD often persisted for at least 3 months. Clinicians should seek and treat depression in adults with glioma.

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At each timepoint, one-third of patients reported significant emotional distress, which persisted during follow-up among those initially highly distressed. Young, functionally impaired, and depressed glioma patients may particularly benefit from increased support.