title: Semantic dementia: demography, familial factors and survival in a consecutive series of 100 cases.
abstract: A great deal has been written about cognitive aspects of semantic dementia but little is known about the demography or prognosis. We describe these features in a consecutive series of 100 patients seen over a 17-year period; all cases were assessed and followed up in a specialist clinic. The mean age at diagnosis was 64.2 (+/-7.1) range 40-79 years, but 46 presented after age 65 and 7 after 75; a higher proportion than the existing literature might predict. Fifteen had a first-degree relative with dementia, but in seven this was almost certainly unrelated. Only two had relatives with young-onset dementia. There were no families with more than two affected members. The familial rate was estimated at between 2% and 7% (95% confidence interval 0-12%). Kaplan-Meier analyses indicated a 50% survival of 12.8 years (95% confidence interval 11.9-13.7); a more benign course than suggested by neuropathologically based studies. We were unable to identify any factors influencing survival. Of the 100, 34 have died, with pathological confirmation in 24; 18 had frontotemporal lobar degeneration with ubiquitin-positive inclusions (13 of 13 confirmed TAR DNA binding protein-43 positive), and 3 had classic tau-positive Pick bodies and 3 had Alzheimer's pathology. The age at diagnosis or death across the pathological subgroups was equivalent. Although semantic dementia has a strong statistical association with ubiquitin-positive pathology, it does not have the signature of familial frontotemporal lobar degeneration with ubiquitin-positive inclusions, notably the presence of intranuclear lentiform TAR DNA binding protein-43 inclusions. The age of onset is older than predicted and the course more slowly progressive than suggested by earlier studies of small groups of subjects.
authors.affiliation: Prince of Wales Medical Research Institute, Cnr Barker & Easy Street, Randwick, NSW 2031, Sydney, Australia. j.hodges@powmri.edu.au
authors.forename: John R
authors.initials: JR
authors.lastname: Hodges
authors.forename: Jo
authors.initials: J
authors.lastname: Mitchell
authors.forename: Kate
authors.initials: K
authors.lastname: Dawson
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Spillantini
authors.forename: John H
authors.initials: JH
authors.lastname: Xuereb
authors.forename: Paul
authors.initials: P
authors.lastname: McMonagle
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Nestor
authors.forename: Karalyn
authors.initials: K
authors.lastname: Patterson
mesh_terms: D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D015331:Cohort Studies; D003710:Demography; D005260:Female; D005500:Follow-Up Studies; D057174:Frontotemporal Lobar Degeneration / Q000453:epidemiology* / Q000235:genetics / Q000401:mortality*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012660:Semantics; D015996:Survival Rate / Q000639:trends