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Abstract Title:

Occupational exposure and amyotrophic lateral sclerosis in a prospective cohort.

Abstract Source:

Occup Environ Med. 2017 08 ;74(8):578-585. Epub 2017 Mar 29. PMID: 28356332

Abstract Author(s):

Tom Koeman, Pauline Slottje, Leo J Schouten, Susan Peters, Anke Huss, Jan H Veldink, Hans Kromhout, Piet A van den Brandt, Roel Vermeulen

Article Affiliation:

Tom Koeman

Abstract:

OBJECTIVE: To prospectively study suspected occupational risk factors for amyotrophic lateral sclerosis (ALS).

METHODS: For this case-cohort analysis within the prospective Netherlands Cohort Study, 58 279 men and 62 573 women aged 55-69 years at enrolment in 1986 were followed up for 17.3 years on ALS mortality. Information on occupational history and potential confounders were collected at baseline through a self-administered questionnaire and entered for a random subcohort (2092 men and 2074 women) and ALS deaths (76 men and 60 women). Occupational exposure to solvents, pesticides, metals, extremely low frequency magnetic fields (ELF-MFs) and electrical shocks was estimated by means of job exposure matrices (JEMs). Associations between ever/never occupationally exposed and cumulativeexposure and ALS mortality were analysed by gender using Cox regression.

RESULTS: Occupational exposure to ELF-MF showed a possible association with ALS mortality among men: HR for ever holding a job with high exposure versus background 2.19 (95% (CI): 1.02 to 4.73) and HR for the highest tertile of cumulative exposure versus background 1.93 (95% CI 1.05 to 3.55).

INTERPRETATION: These results strengthen the evidence suggesting a positive association between ELF-MF exposure and ALS. We did not replicate earlier positive findings for other occupational exposures.

Study Type : Human Study

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