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Aplastic Anemia Epidemiology: Incidence and Case-control

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: May 25, 2000
Last updated: February 17, 2016
Last verified: May 2000
To conduct incidence and case-control studies of aplastic anemia in metropolitan Bangkok, Thailand

Blood Disease
Anemia, Aplastic

Study Type: Observational

Resource links provided by NLM:

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: September 1988
Study Completion Date: August 1994
Detailed Description:


Aplastic anemia, a form of bone marrow failure, is a disease of largely unknown cause, except for the rare situations involving high doses of radiation. Many agents have been mentioned in case reports to be associated with the development of aplastic anemia and include drugs, chemicals, pesticides, radiation, and viral infection. Of these, chloramphenicol, phenylbutazone, and insecticides are most frequently reported. In the United States and other developed countries the disease prevalence is so low that too few cases occur to make an epidemiological study in a single city logistically feasible. The Bangkok hospitalization rate for aplastic anemia was sufficient to conduct a case-control study. Also, a study conducted in this locale provided information on drugs and chemicals not commonly used in developed countries.


All aplastic anemia cases in metropolitan Bangkok were located and verified in the forty hospitals that agreed to participate in the study. Incidence rates were calculated by age group and sex. In the case-control study, interviews were used to obtain comprehensive histories of drug, chemical, pesticide, radiation, viral infections, and other exposures, along with relevant demographic and medical history information in order to examine the association between and test hypotheses regarding suspected hazards and to estimate the risks of developing aplastic anemia. The basic epidemiologic features of aplastic anemia were described by characterizing these patients in terms of standard demographic variables, age, race, sex, and medical history. The degree of association between viral hepatitis and the development of aplastic anemia was estimated.

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


Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria
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Please refer to this study by its identifier: NCT00005682

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: Paul Leaverton
OverallOfficial: Samuel Shapiro
  More Information

Publications: Identifier: NCT00005682     History of Changes
Other Study ID Numbers: 3008  R01HL035068 
Study First Received: May 25, 2000
Last Updated: February 17, 2016
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Hematologic Diseases
Anemia, Aplastic
Bone Marrow Diseases processed this record on October 21, 2016