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NCT00559065

A Case-Cohort Study of Hematopoietic Malignancies and Related Disorders and Lung Cancer in Benzene-Exposed Workers in China

Completed Last updated 12 May 2021
What this trial tests

trial in Lung Cancer in 3,260 participants. Completed in 6 November 2020.

Timeline
11 July 2006
Primary endpoint
31 December 2016
6 November 2020

Quick facts

Lead sponsorNational Cancer Institute (NCI)
StatusCompleted
Study typeOBSERVATIONAL
Enrollment3,260
Start date11 July 2006
Primary completion31 December 2016
Estimated completion6 November 2020
Sites1 location across China

Conditions studied

Sponsor

National Cancer Institute (NCI)

Who can join

Adults 21 to 90, any sex, with Lung Cancer or Lymphoma. Patients with the condition only — healthy volunteers not accepted.

Sponsor's own description

This study will examine the risks of workplace exposure to benzene, a substance known to lead to cancer of the blood and possibly of the lungs. It is used widely in industries and is a contaminant in the environment. Researchers from the National Cancer Institute and the China Center for Disease Control (formerly Chinese Academy of Preventive Medicine) had done previous studies of workers in manufacturing industries in China of people who worked at least 1 day from 1972 to 1987 in 12 cities in that country. Data were collected of approximately 75,000 workers exposed to benzene and 35,000 who were not, with the purpose of investigating the relationship between benzene exposure and cancer risk. For workers exposed to benzene, there was a significant risk of cancer affecting the blood cells and a 1.8-fold excess of lung cancer among them. This study will expand those findings and also identify the effects of benzene amounts and whether there is a genetic tendency for benzene poisoning. About 3,860 benzene-exposed workers from the 12 cities will be interviewed. Next-of-kin of deceased workers, and a subcohort (additional grouping) of participants will serve as a control group in the research. Patients who have worked at places where there was exposure to benzene will have a brief physical exam and samples of cells from a mouth rinse and samples from blood will be collected to study the genetic influence on developing blood diseases from workplace exposures. All participants or next-of-kin, for deceased, will be given a questionnaire about their work history, use of cigarettes and hair dyes, medications they take, and family history of cancer. Interviews of about 40 minutes long will be conducted at participants homes or workplaces, at a time convenient to them, and the interviews will be audiotaped.

Publications & conference data

No peer-reviewed publications indexed yet for this trial. Completed trials usually publish results within 12-18 months.

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