A new study published in Nature Communications, has found molecular signs of changes in the blood of people who had been exposed to air pollution. The interesting part is that these changes were detectable several years before they were diagnosed with lung cancer. These findings provide promising clues that could help shape future cancer research and prevention strategies.
Study Examines Air Pollution and Blood Changes
In this study, the team analyzed blood samples from 1357 cancer-free people in the ACS Cancer Prevention Study cohorts and found changes in small molecules that were linked to long-term exposure to air pollution. They found that eight metabolites were associated with both pollution exposure and subsequent lung cancer, while four showed statically significant mediation signals. Though the findings do not establish that these metabolites directly cause lung cancer but provide prospective evidence for biological pathways that could help in explaining how long-term air pollution contributes to lung carcinogenesis.
Air Pollution and Lung Cancer Screening
Long-term exposure to ambient air pollution is a known environmental risk factor for lung cancer and related respiratory diseases. But, lung cancer screenings are only recommended for those aged 50 to 80 years old with substantial history of smoking. This new study could guide future development of blood-based biomarkers that help to identify more popular with higher risk of lung cancer.
Researchers Highlight Potential of Blood Biomarkers
“What is especially exciting about this study is that we now identified measurable changes in human blood metabolome associated with air pollution exposure years before lung cancer was diagnosed,” says Donghai Liang, who is also a member of the Cancer Prevention and Control Research Program. “These new findings give us a clearer picture of the biological processes connecting air pollution and lung cancer. And with further validation, maybe one day, it could help us identify people at elevated risk and determine whether air pollution exposure should be considered in future prevention and screening strategies.”
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FAQ
Can air pollution increase lung cancer risk?
Yes. Long-term exposure to ambient air pollution is a recognized environmental risk factor for lung cancer and other respiratory diseases.
How is air pollution linked to lung cancer?
The study identified changes in blood metabolites associated with long-term air pollution exposure and later lung cancer development, offering clues about possible biological pathways.
Can a blood test predict lung cancer risk?
The findings suggest that blood-based biomarkers could potentially help identify people at higher risk in the future, but more research and validation are needed.
What did the study find about blood metabolites?
Researchers identified eight metabolites associated with both air pollution exposure and subsequent lung cancer, while four showed statistically significant mediation signals.
Could air pollution be included in future lung cancer screening?
The researchers suggest their findings could help determine whether air pollution exposure should be considered in future lung cancer prevention and screening strategies.
Who is currently eligible for lung cancer screening?
Current screening recommendations primarily focus on older adults with a substantial history of smoking. Research like this could eventually help identify additional high-risk groups.