Cited by 1,144Dementia and Cognitive Impairment ResearchAlzheimer's disease research and treatmentsAmyotrophic Lateral Sclerosis Research

Frontotemporal dementia

Open access
Bang, Jee, Spina, Salvatore, Miller, Bruce L·2015·The Lancet

Abstract

Frontotemporal dementia is an umbrella clinical term that encompasses a group of neurodegenerative diseases characterised by progressive deficits in behaviour, executive function, or language. Frontotemporal dementia is a common type of dementia, particularly in patients younger than 65 years. The disease can mimic many psychiatric disorders because of the prominent behavioural features. Various underlying neuropathological entities lead to the frontotemporal dementia clinical phenotype, all of which are characterised by the selective degeneration of the frontal and temporal cortices. Genetics is an important risk factor for frontotemporal dementia. Advances in clinical, imaging, and molecular characterisation have increased the accuracy of frontotemporal dementia diagnosis, thus allowing for the accurate differentiation of these syndromes from psychiatric disorders. As the understanding of the molecular basis for frontotemporal dementia improves, rational therapies are beginning to emerge.

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Crossref · 10.1016/s0140-6736(15)00461-4

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  • FTD and AD are the two most common types of dementia in the younger-elderly population.

    “precise identification of FTD and AD, which are the two most common types of dementia in the younger-elderly population (Bang et al., 2015; Association, 2019), is of vital clinical significance in the diagnosis of dementias.”

    From Deep Learning-Based Classification and Voxel-Based Visualization of Frontotemporal Dementia and Alzheimer's Disease (2021) · cites this paper as Bang et al., 2015

    The Epidemiology section describes FTD as the second or third most prevalent dementia subtype in most studies of people younger than 65, supporting its prominence in this age group but not consistently placing it among the top two. The Introduction identifies Alzheimer’s disease as more common than FTD across all ages, but does not establish the claimed two-type ranking for the younger population. Page numbers are unavailable in our copy. (LLM, conf=0.87)

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  • MAPT expression was elevated selectively within the neocortex, with highest total MAPT RNA levels in the temporal lobe.

    “Building on prior studies evaluating MAPT expression within the normal adult brain [31], we found elevated total MAPT expression selectively within the neocortex. Across all evaluated regions, total MAPT RNA levels were highest within the temporal lobe, one of the earliest regions implicated in FTD ([4], see Figure 5).”

    From Shared genetic risk between corticobasal degeneration, progressive supranuclear palsy, and frontotemporal dementia (2017) · cites this paper as [4]

    Citation [4] is attached to the statement that the temporal lobe is among the earliest regions implicated in FTD, not to the citing authors’ MAPT RNA findings. The Neuropathology section identifies anterior temporal-lobe involvement, but lists other regions as the sites of initial changes. It therefore supports temporal involvement, not the claim about its earliest timing. (LLM, conf=0.82)

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  • About 50% of patients with frontotemporal dementia initially receive a psychiatric diagnosis, leading to a delay in correct diagnosis of up to 5-6 years.

    “About 50% of patients with frontotemporal dementia initially receive one of the above‐mentioned psychiatric diagnoses, leading to a delay in the correct diagnosis of up to 5‐6 years 171 .”
  • Frontotemporal dementia is an umbrella term for diverse neurodegenerative disorders characterized by atrophy in the frontal and temporal lobes, with a clinical picture dominated by behavioral-executive dysfunction or language disturbance.

    “Frontotemporal dementia is an umbrella term for a diverse group of neurodegenerative disorders characterized by atrophy in the frontal and temporal lobes, with a clinical picture dominated by a behavioral‐executive dysfunction (behavioral variant) or a language disturbance (semantic and progressive non‐fluent aphasia variants) 171 .”

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Authors
Bang, J., Spina, S., & Miller, B. L.
Affiliations
University of California, San Francisco (US)
Corresponding author
Miller, Bruce L
Venue
The Lancet
Publisher
Elsevier BV
Published
2015-10
Volume
386
Issue
10004
Pages
1672-1682
ISSN
  • 0099-5355 (ISSN-L)
  • 0140-6736
OpenAlex
W4241875855
Cited by
1,144
References
83
Citations by year
2026: 120 · 2025: 128 · 2024: 154 · 2023: 112 · 2022: 133 · 2021: 121 · 2020: 124 · 2019: 91 · 2018: 72 · 2017: 56 · 2016: 31
FWCI
7.12
Type
journal article
Language
en
Open access
Locations
  • The Lancet (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
National Institute on Aging (P01AG019724, T32AG023481)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
frontotemporal dementia, neurodegenerative diseases, behavioural deficits, executive dysfunction, language deficits, early-onset dementia, neuropathology, genetic risk factors, molecular characterization, dementia diagnosis, dementia treatment
MeSH terms
Adult, Aged, Alzheimer Disease, Aphasia, Mental Disorders, Diagnosis, Differential, Diagnostic Imaging, Humans, Middle Aged, Motor Neuron Disease, Neurodegenerative Diseases, Frontotemporal Lobar Degeneration, Frontotemporal Dementia

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