Studying Blood Toxicity in Workers Exposed to Formaldehyde
|First Received Date ICMJE||March 6, 2012|
|Last Updated Date||March 14, 2014|
|Start Date ICMJE||February 2012|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE||Not Provided|
|Original Primary Outcome Measures ICMJE||Not Provided|
|Change History||Complete list of historical versions of study NCT01547858 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Studying Blood Toxicity in Workers Exposed to Formaldehyde|
|Official Title ICMJE||A Cross-Sectional Study of Hematotoxicity in Workers Exposed to Formaldehyde|
- Formaldehyde has many uses in industry and medicine. However, exposure to formaldehyde has been associated with increased risk for myeloid leukemia. There are still questions about how the chemical reacts with bone marrow to increase this cancer risk. Some smaller studies have looked at how it affects stem cells, which are found in bone marrow. Researchers want to develop a much larger study of workers in China. The study will look at different levels of formaldehyde exposure. It will focus on how the chemical affects the blood cells and bone marrow.
- To study the effects of formaldehyde exposure on blood cells and bone marrow.
- Individuals between 18 and 60 years of age who work in selected factories in Guangdong Province, China.
Research in industrial workers and professionals exposed to formaldehyde suggests that occupational exposure to this important chemical is associated with increased risk for myeloid leukemia. However, there is still uncertainty about the biologic plausibility of the association because of questions regarding the ability of formaldehyde, which is extremely reactive, to directly or indirectly cause toxicity to the bone marrow. There have been several relatively small studies of the impact of occupational formaldehyde exposure on peripheral blood cells that found some evidence that peripheral blood cells of the myeloid lineage (i.e., granulocytes, platelets) were significantly decreased in exposed workers. We propose to follow-up these findings in a relatively large study population in China. We will study hematologic parameters in 200 higher exposed workers (> 1 ppm), 200 workers exposed to lower levels of formaldehyde (0.3 to 1 ppm), and a group of 200 unexposed controls frequency-matched to exposed workers. This study will make an important contribution to our understanding of the leukemogenic potential of formaldehyde, which has important public health and regulatory implications.
|Study Type ICMJE||Observational|
|Study Design ICMJE||Time Perspective: Retrospective|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Intervention ICMJE||Not Provided|
|Study Group/Cohort (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Estimated Enrollment ICMJE||720|
|Completion Date||Not Provided|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
Exclusion criteria for both formaldehyde-exposed and control workers will be:
- A history of cancer, chemotherapy, and/or radiotherapy, as well as previous or current occupational exposure to benzene, butadiene, styrene and radiation.
|Ages||18 Years to 70 Years|
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||United States|
|NCT Number ICMJE||NCT01547858|
|Other Study ID Numbers ICMJE||999912055, 12-C-N055|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||National Cancer Institute (NCI)|
|Collaborators ICMJE||Not Provided|
|Information Provided By||National Institutes of Health Clinical Center (CC)|
|Verification Date||November 2013|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP