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Home News Environment

Air pollution linked to heightened mouth cancer risk

The first study of its kind discovered that high levels of fine particulate matter and to a lesser extent, ozone, may be key

Joe Mellor by Joe Mellor
2018-10-09 23:45
in Environment, Health, News
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Soot particles from burning fossil fuels increases the risk of mouth cancer, warns new research.

The first study of its kind discovered that high levels of fine particulate matter from engines, power stations and factories, and to a lesser extent, ozone, may be key.

The findings, published online by the Journal of Investigative Medicine, show that the number of new cases, and deaths from, mouth cancer is increasing in many parts of the world.

Known risk factors include smoking, drinking, human papilloma virus (HPV), and in parts of South East Asia, the chewing of ‘paan’ – a mix of ingredients wrapped in betel leaf.

Exposure to heavy metals and emissions from petrochemical plants are also thought to be implicated in the development of mouth cancer, while air pollution, especially small smog particles PM2.5, is known to be harmful to respiratory and cardiovascular health.

To find out if air pollutants might have a role in the development of mouth cancer, the researchers looked at national cancer, health, insurance, and air quality databases.

They drew on average levels of air pollutants – sulphur dioxide, carbon monoxide, ozone, nitrogen monoxide, nitrogen dioxide, and varying sizes of fine particulate matter – measured in 2009 at 66 air quality monitoring stations across Taiwan.

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In 2012-13, they checked the health records of 482,659 men aged 40 and older who had attended preventive health services, and had provided information on smoking or paan chewing.

Diagnoses of mouth cancer were then linked to local area readings for air pollutants taken in 2009.

In 2012-13, 1,617 cases of mouth cancer were diagnosed among the men.

Smoking and frequent paan chewing were “significantly associated” with heightened risk of a diagnosis.

But so too were high levels of PM2.5. After taking account of potentially influential factors, increasing levels of PM2.5 were associated with an increasing risk of mouth cancer.

When compared with levels below 26.74 ug/m3, those above 40.37 ug/ m3 were associated with a 43 per cent heightened risk of a mouth cancer diagnosis.

A significant association was also observed for ozone levels below 28.69-30.97 parts per billion.

The researchers said it was an observational study, so can’t establish cause.

And there are certain limitations to consider, such as the lack of data on how much PM2.5 enters the mouth, or on long term exposure to the pollutant.

Nor is it clear how air pollutants might contribute to mouth cancer.

But they said some of the components of PM2.5 include heavy metals, as well as compounds such as polycyclic aromatic hydrocarbons – known cancer causing agents.

Study author Dr Michael McPhaul, of Quest Diagnostics in the US said: “The smaller diameter, but larger surface area, of PM2.5 means that it can be relatively easily absorbed while at the same time potentially wreaking greater havoc on the body.”

“This study, with a large sample size, is the first to associate oral cancer with PM2.5.

“These findings add to the growing evidence on the adverse effects of PM2.5 on human health.”

 

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