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NEW YORK, Apr 19 – Early exposure to common forms of environmental pollution may significantly increase the risk of developing thyroid cancer in children and young adults, a recent study led by Yale University researchers suggests. The findings, published in the journal Environmental Health Perspectives, point to a concerning link between fine particulate matter (PM2.5) air pollution and outdoor artificial light at night (O-ALAN) during crucial early developmental stages and the subsequent diagnosis of papillary thyroid cancer before the age of 20.
The research team uncovered what they described as a “significant association” between these environmental exposures and a heightened risk of this specific type of thyroid cancer. The study highlights particular concern regarding exposure during the perinatal period – spanning from pregnancy through the first year after birth – given the widespread nature of both PM2.5 and light pollution, especially in urban environments.
Fine particulate matter (PM2.5) largely originates from urban air pollution sources such as vehicle traffic and industrial emissions, explained Dr. Nicole Deziel, the study’s lead author and an environmental epidemiologist at Yale School of Public Health. Concurrently, artificial light at night represents an increasing environmental pressure in densely populated regions.
Quantifying the risk, the study found that for every 10 microgram per cubic meter increase in ambient PM2.5 levels, the odds of developing paediatric thyroid cancer could rise by 7%. Furthermore, the research indicated that children living in areas exposed to high levels of outdoor artificial light at night were 23–25% more likely to be diagnosed with the condition compared to those in areas with lower light pollution.
Conducted in California, the study analysed data from 736 individuals diagnosed with papillary thyroid cancer before age 20 and compared them with nearly 37,000 matched control participants without the disease. The results suggested that teenagers (ages 15–19) and Hispanic children might face a disproportionately higher risk associated with these environmental factors.
“Thyroid cancer is one of the fastest-growing cancers among children, but we still lack sufficient understanding of what contributes to its rise in this age group,” stated Dr. Deziel. The authors emphasize that while their findings are significant, further research is essential to confirm the results and to fully explore the implications for public health, particularly concerning how environmental factors may influence the development of childhood cancers.
Disclaimer: This news article is based on findings from a single observational study published in Environmental Health Perspectives. While the study suggests an association between early life exposure to PM2.5 and O-ALAN and paediatric thyroid cancer, observational studies cannot definitively prove causation. Further research, including studies with different methodologies and populations, is necessary to confirm these findings and understand the potential mechanisms involved.
