Survival in Frontotemporal Dementia Phenotypes: A Meta-Analysis

Area of Science:

• Neurology
• Neuroscience
• Clinical Medicine

Background:

• Survival in frontotemporal dementia (FTD) remains poorly understood.
• Phenotypic differences and contributing factors to FTD survival require further investigation.

Purpose of the Study:

• To conduct a mixed-effects meta-analysis of survival data in frontotemporal dementia (FTD).
• To examine differences in survival across various FTD phenotypes and identify contributory factors.

Main Methods:

• A comprehensive search of six major databases (PubMed, Medline, EMBASE, CINAHL, PsycINFO, Cochrane) was performed.
• Studies reporting survival or natural history of specific FTD subtypes (bvFTD, PNFA, SD, FTD-ALS) and related conditions were included.
• No language restrictions were applied to the study selection.

Main Results:

• Data from 27 studies encompassing 2,462 subjects were analyzed.
• Survival durations varied significantly across FTD phenotypes: FTD-ALS (2.5 years), bvFTD/PNFA (8 years mean), and SD (12 years median).
• Alzheimer's disease (AD) survival was comparable to most FTD subtypes, except for FTD-ALS. Age and sex did not impact survival; education's effect was inconclusive.

Conclusions:

• Survival rates differ among FTD phenotypes, with most comparing favorably to Alzheimer's disease survival.
• FTD-ALS exhibits significantly shorter survival compared to other FTD subtypes and AD.
• Further research into causes of within-phenotype survival heterogeneity, including comorbidities, could inform tailored interventions.