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Exposure to Neurotoxins as Risk Factors for Amyotrophic Lateral Sclerosis

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: June 19, 2006
Last updated: January 24, 2017
Last verified: April 21, 2008
This study is a follow-up to an earlier study that examined the relationship of This study will examine whether exposure to neurotoxins, such as lead, mercury, solvents, and pesticides, can contribute to amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease. The cause of this degenerative disease of the brain and spinal cord is not well understood. Some studies suggest that exposure to environmental neurotoxins may increase its risk. This follow-up study will examine the relationship of neurotoxin exposure to the interval between the diagnosis of ALS and death. It will also examine the possible roles of genetics, lifestyle and dietary factors in the disease. Information on ALS patients previously enrolled in the study will be used to examine this relationship. No new individuals will be enrolled in the study.

Amyotrophic Lateral Sclerosis

Study Type: Observational
Official Title: Ascertainment of Death in ALS Patients

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 0
Study Start Date: August 6, 2002
Estimated Study Completion Date: April 21, 2008
Detailed Description:

Objective: The objective of this proposal is linkage with the National Death Index (NDI) for cases from a study that was conducted in the early 1990's. The purpose of the initial study was to examine the role that lead and other exposures, including mercury and solvents, play in the etiology of amyotrophic lateral sclerosis (ALS).

Study population: The study involved 110 ALS cases and 256 population based controls, recruited in New England between 1993 and 1996. Data collection involved an interview, blood collection, and measurement of bone lead using x-ray fluorescence.

Design and outcome parameters: The results of this study suggested that lead exposure was a risk factor for ALS. Compared to controls, cases were more likely to have occupational lead exposure, and both blood and bone lead levels were higher in cases. We are presently analyzing data on other neurotoxic exposures including mercury, solvents, and pesticides. In order to investigate prognosis, we would like to determine the date of death by searching the National Death Index. This information will enable us to evaluate the relationship of neurotoxic exposures to ALS prognosis.


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

The purpose of the NDI search will be to verify death and obtain date and cause of death information for the study participants.

  Contacts and Locations
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Please refer to this study by its identifier: NCT00339976

United States, North Carolina
NIEHS, Research Triangle Park
Research Triangle Park, North Carolina, United States, 27709
Sponsors and Collaborators
National Institute of Environmental Health Sciences (NIEHS)
  More Information

Publications: Identifier: NCT00339976     History of Changes
Other Study ID Numbers: 999902275
Study First Received: June 19, 2006
Last Updated: January 24, 2017

Keywords provided by National Institutes of Health Clinical Center (CC):
Case-Control Study
Death Certificates
National Death Index
Cause of Death Information
Lead Exposure
Amyotrophic Lateral Sclerosis

Additional relevant MeSH terms:
Motor Neuron Disease
Amyotrophic Lateral Sclerosis
Pathologic Processes
Neurodegenerative Diseases
Nervous System Diseases
Neuromuscular Diseases
Spinal Cord Diseases
Central Nervous System Diseases
TDP-43 Proteinopathies
Proteostasis Deficiencies
Metabolic Diseases processed this record on April 27, 2017