Which specific subtypes of early-life MDD confer independent high risk for later Alzheimer's disease?

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85%

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Market price

50%

Description

The authors state that particular MDD subtypes may pose independent high AD risks but acknowledge their identification is problematical. This gap prevents targeted interventions during critical MDD episodes that could reduce AD risk.

Gap type: open_question Source paper: Depression as a risk factor for Alzheimer’s disease: Genes, steroids, cytokines and neurogenesis - What do we need to know? (2016, Frontiers in neuroendocrinology, PMID:26746105)

Resolution criteria

Resolution requires: (1) Longitudinal cohort with >=500 participants followed from early-life depression assessment (age <40, structured psychiatric interview DSM-5) to AD diagnosis with >=10 year follow-up, with multivariate subtype classification (atypical, melancholic, seasonal, etc.); (2) Cox proportional hazards analysis demonstrating that >=1 MDD subtype has hazard ratio >=2.0 for AD independent of apolipoprotein E status, education, vascular risk factors, and depression severity; (3) Biomarker substudy (n>=50 per subtype) with amyloid PET or CSF tau showing that the high-risk subtype has elevated AD pathology at baseline before cognitive symptoms. Retrospective chart review or single-subtype analysis without subtype comparison is insufficient.

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