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Etiology of Blood Dyscrasias: Analysis of the International Agranulocytosis and Aplastic Anemia Study Data

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ClinicalTrials.gov Identifier: NCT00005307
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : May 13, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To quantify the role of drugs and other factors in the etiology of agranulocytosis and aplastic anemia.

Condition or disease
Anemia, Aplastic Blood Disease Agranulocytosis

Detailed Description:


Agranulocytosis and aplastic anemia are rare but serious blood diseases that can be caused by drugs and other environmental factors. In 1980, there were only limited quantitative estimates of the risk between various exposures, particularly drugs, and the two dyscrasias. The data were collected in the IAAAS, a multicenter population-based case-control study conducted from 1980 to 1986 in eight regions. The study was funded by a pharmaceutical company to investigate a single hypothesis, but information was obtained on all drugs and on other factors, enabling a general investigation of the dyscrasias.


The study was for retrospective data analysis only. Standard case-control methods were used. In most instances, multivariate analysis was used to control confounding, especially by simultaneous use of other causal drugs. Adverse effects and the relative safety of drugs in relation to the two dyscrasias were documented. Because the IAAAS was population-based, incidence rates were provided directly, and excess risks were estimated for associated drugs. Such quantitative measures of association were generally unavailable. Among the drugs that were analyzed were various categories such as psychotropics, antihistamines, and cardiovascular drugs, and individual drugs such as allopurinol. Factors other than drugs were also evaluated, including exposure to radiation and chemicals such as benzene and insecticides, history of viral infection, and history of allergy and other conditions.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

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Study Type : Observational
Study Start Date : April 1989
Actual Study Completion Date : March 1991

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Information from the National Library of Medicine

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Ages Eligible for Study:   up to 100 Years   (Child, Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria
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ClinicalTrials.gov Identifier: NCT00005307    
Other Study ID Numbers: 3009
R01HL042524 ( U.S. NIH Grant/Contract )
First Posted: May 26, 2000    Key Record Dates
Last Update Posted: May 13, 2016
Last Verified: May 2000
Additional relevant MeSH terms:
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Hematologic Diseases
Anemia, Aplastic
Bone Marrow Failure Disorders
Bone Marrow Diseases
Leukocyte Disorders