Smoky Coal Exposure, Genetic Susceptibility, and Lung Cancer in Non-Smoking Women in China
- Conditions
- Lung Neoplasms
- Registration Number
- NCT00482118
- Lead Sponsor
- National Cancer Institute (NCI)
- Brief Summary
Background:
* Women in Xuan Wei County, China, are almost all non-smokers, yet they have the highest lung cancer rate in that country.
* Non-smoking women in Xuan Wei who use smoky coal for cooking and heating homes can inhale 10 times higher levels of polycyclic aromatic hydrocarbons (PAH, compounds formed in many burning organic substances, including smoky coal) than someone who smokes 20 cigarettes a day.
Objectives:
* Determine the health effects of smoky coal in Xuan Wei and Fu Yuan counties in China's Yun Nan Province
* Determine how different levels of exposure to smoky coal and other types of fuel affect the amount of smoky coal emissions that are absorbed into the body
* Determine genetic risk factors for lung cancer in the study population and determine how they interact with smoky coal and PAH exposure.
Eligibility:
* Women from Xuan Wei and Fu Yuan counties between 18 and 79 years of age who have lung cancer and do or do not use smoky coal
* Women from Xuan Wei and Fu Yuan counties between 18 and 79 years of age who do not have lung cancer and do or do not use smoky coal
Design:
-Exposure assessment study for users of smoky coal - 150 households
Use of air badges, monitors, and dermal badges to determine subjects' exposure to smoky coal
Collection of blood, urine, cheek cell and sputum samples to measure the amount of smoky coal emissions absorbed into the body and evaluate the types of biologic changes they cause
Interview subjects about their health and family history, occupational exposures, lifestyle factors (e.g., tobacco smoking and diet), and inherited differences in genes
-Case-control study - 1,000 women
Collection of blood, urine, cheek cell and sputum samples to measure how amount of smoky coal emissions absorbed into the body and evaluate types of biologic changes they cause
Interview subjects about their health and family history, occupational exposures, lifestyle factors (e.g., tobacco smoking and diet), and inherited differences in genes
Gene analysis to determine if a genetic variation is associated with an increased or decreased risk of health effects from smoky coal exposure
- Detailed Description
Females in Xuan Wei County are almost all non-smokers, yet they have the highest lung cancer rate in China. Non-smoking women in Xuan Wei who use smoky coal in their home can inhale ten times higher levels of PAHs than a 20 cigarette per day active smoker, and air concentrations approach levels experienced by workers on the top-side of coke ovens. Several lines of research have provided strong support that the excess lung cancer in this region is caused primarily by PAHs derived from smoky coal exposure. As such, this region of China provides one of the best opportunities in the world to carry out a model study of gene-environment interactions in lung cancer. We have designed a hospital-based case-control study of 500 lung cancer cases and 500 controls among non-smoking women, with controls to be selected through a randomized recruitment design to achieve balance for the main effects of smoky coal exposure and ultimately greater power to detect interactions. The study will be carried out over a three-year period in Xuan Wei and Fu Yuan Counties in Yun Nan Province, China. In addition, we will be carrying out an exposure assessment study (n=150 households) to evaluate air and dermal exposure to PAHs from smoky coal use in order to model PAH exposure experienced by subjects in the case-control study. We will collect buccal cell, sputum, blood, and urine samples from all subjects. The primary goal of the study is to characterize genetic risk factors at the DNA level for lung cancer in this population and determine how they interact with smoky coal and PAH exposure. In addition, the hospital-based design will enable us to collect venous blood samples and cryopreserve lymphocytes, which will allow us to carry out state-of-the-art functional susceptibility assays such as testing ability to repair PAH-damaged DNA and apoptotic capacity, and to measure integrative markers of genomic stability such as telomere length and oxidative damage in mitochondrial DNA. These types of assays have never been conducted in this population and hold great promise to provide insights into cancer risk that will compliment those obtained by genotyping. This study will provide an important complement to and contrast with both DCEG and extramural studies of tobacco smoking and lung cancer, where unraveling the genetic component is challenging in part because hundreds of tobacco carcinogens in various combinations likely contribute.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Female
- Target Recruitment
- 3720
Not provided
Not provided
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method Genetic polymorphisms in genes related to PAH metabolism, cell cycle control, and DNA repair associated with the risk of lung cancer 2006-2034 Outcome will involve discovering genes related to lung cancer risks among non-smoking Asian women.
Response-gradient for PAH exposure and lung cancer risk 2006-2034 Outcome from this study will include the observation of response-gradient for PAHs exposure due to indoor burning biomass and risk of lung cancer.
Whether polymorphisms in genes related to PAH metabolism, cell cycle control, and DNA repair modify the PAHs-lung cancer association 2006-2034 Outcome will also involve the GXE analysis to explore the interaction between genetic factors and environmental exposure.
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (4)
The University of Hong Kong
🇨🇳Hong Kong, China
Kunming Medical University
🇨🇳Kunming, China
China Medical University
🇨🇳Shenyang, China
National University of Singapore
🇨🇳Singapore, China
The University of Hong Kong🇨🇳Hong Kong, China