Association of ALS with head injury, cigarette smoking and APOE genotypes.


Journal Article

OBJECTIVE: An increased risk of ALS has been reported for US veterans, but the cause is unknown. Since head injury and cigarette smoking are two previously implicated environmental risk factors that are more common in military than civilian study populations, we tested their association with ALS in a US veteran study population. METHODS: We used logistic regression to examine the association of ALS with head injury and cigarette smoking in 241 incident cases and 597 controls. Since APOE is a plausible ALS candidate gene, we also tested its main effect and its statistical interaction with these environmental exposures. RESULTS: Cigarette smoking was not associated with ALS in this predominantly male and Caucasian population. Veterans who had experienced head injuries during the last 15years before the reference date had an adjusted odds ratio of 2.33 (95% confidence interval 1.18-4.61), relative to veterans without any head injuries. This association was strongest in APOE-4 carriers. CONCLUSIONS: Our results add to the body of evidence suggesting that head injuries may be a risk factor for multiple neurodegenerative diseases, including ALS. We hypothesize that the strength of association between head injuries and ALS may depend upon APOE genotype.

Full Text

Duke Authors

Cited Authors

  • Schmidt, S; Kwee, LC; Allen, KD; Oddone, EZ

Published Date

  • April 15, 2010

Published In

Volume / Issue

  • 291 / 1-2

Start / End Page

  • 22 - 29

PubMed ID

  • 20129626

Pubmed Central ID

  • 20129626

Electronic International Standard Serial Number (EISSN)

  • 1878-5883

Digital Object Identifier (DOI)

  • 10.1016/j.jns.2010.01.011


  • eng

Conference Location

  • Netherlands