期刊
JAMA NEUROLOGY
卷 70, 期 3, 页码 365-373出版社
AMER MEDICAL ASSOC
DOI: 10.1001/2013.jamaneurol.181
关键词
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资金
- Interuniversity Attraction Poles program of the Belgian Science Policy Office [P6/43]
- Foundation for Alzheimer Research (SAO/FRMA)
- Medical Foundation Queen Elisabeth
- Methusalem Excellence Program of the Flemish government
- Research Foundation Flanders (FWO)
- Agency for Innovation by Science and Technology Flanders (IWT)
- Special Research Fund of the University of Antwerp, Belgium
- Flemish government
- IWT
- FWO
Objective: To characterize patients with frontotemporal lobar degeneration (FTLD) with a repeat expansion mutation in the gene C9orf72, and to determine whether there are differences in the clinical presentation compared with FTLD carriers of a mutation in GRN or MAPT or with patients with FTLD without mutation. Design: Patient series. Setting: Dementia clinics in Flanders, Belgium. Patients: Two hundred seventy-five genetically and phenotypically thoroughly characterized patients with FTLD. Main Outcome Measures: Clinical and demographic characteristics of 26 C9orf72 expansion carriers compared with patients with a GRN or MAPT mutation, as well as patients with familial and sporadic FTLD without mutation. Results: C9orf72 expansion carriers developed FTLD at an early age (average, 55.3 years; range, 42-69 years), significantly earlier than in GRN mutation carriers or patients with FTLD without mutation. Mean survival (6.2 years; range, 1.5-17.0 years) was similar to other patient groups. Most developed behavioral variant frontotemporal dementia (85%), with disinhibited behavior as the prominent feature. Concomitant amyotrophic lateral sclerosis is a strong distinguishing feature for C9orf72-associated FTLD. However, in most patients (73%), amyotrophic lateral sclerosis symptoms were absent. Compared with C9orf72 expansion carriers, nonfluent aphasia and limb apraxia were significantly more common in GRN mutation carriers. Conclusions: C9orf72-associated FTLD most often presents with early-onset behavioral variant frontotemporal dementia with disinhibition as the prominent feature, with or without amyotrophic lateral sclerosis. Based on the observed genotype-phenotype correlations between the different FTLD syndromes and different genetic causes, we propose a decision tree to guide clinical genetic testing in patients clinically diagnosed as having FTLD. JAMA Neurol. 2013;70(3):365-373. Published online January 21, 2013. doi:10.1001/2013.jamaneurol.181
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