Category: International News

Increased Asbestos Use in Mexico Leading to More Mesothelioma Deaths

• Nancy Meredith
• Asbestos Exposure, International News, Research

Industrial uses of asbestos in Mexico are increasing the number of mesothelioma-related diseases and deaths among Mexican workers, according to a scientific study in the American Journal of Industrial Medicine. The researchers say Mexico should ban the use of asbestos in all production processes as a public health policy to control the epidemic of asbestos-related diseases and safeguard the population and future generations.

Malignant mesothelioma is an incurable cancer of the lining of the lungs or abdomen closely associated with breathing asbestos. The World Health Organization has urged countries to ban the use of asbestos, saying there is no safe level of asbestos exposure.

In their study, occupational health researchers from the Mexican Institute of Social Security and several Mexican cancer hospitals sought to identify the proportion of cases of malignant pleural mesothelioma in Mexico that were attributable to workplace exposure. Despite numerous studies around the world that have underscored the adverse effects of asbestos on workers’ health, the researchers said there was a general lack of recognition of the hazard of asbestos exposure in Mexico.

Because mesothelioma is not recognized as a work-related disease in Mexico, the country’s national health system and Mexican Institute of Social Security, which insures 30 percent of the country’s economically active population, absorb millions of dollars in costs to care for patients with mesothelioma rather than the industries that caused their disease.

In Mexico, chrysotile asbestos —also known as white asbestos—imported from Canada is the most commonly used asbestos fiber and represents the largest threat to workers, the study says. The shipment of asbestos to Mexico is part of an ongoing migration of dangerous industries to less industrialized countries such as Mexico that possess a weak framework for worker protection, the researchers noted. From 1991-2000, Mexico imported about 8 percent of Canada’s total international exports of asbestos, representing $114 million in exports.

Researchers interviewed 472 workers who lived in the Valley of Mexico, an area of central Mexico that encompasses the Mexico City metropolitan area, to assess their potential exposure to asbestos from their jobs as well as from environmental factors such as living near an asbestos factory or having parents who worked around asbestos. More than 100 of the workers had been diagnosed with mesothelioma.

The researchers attributed 82 percent of the cases of mesothelioma in the lining of the lung to workplace exposure to asbestos. They said the pattern of asbestos exposure and disease observed in more industrialized nations in the 1970s is now repeating itselt in Mexico.

“Our results show a clear relationship between industrial use of all types of asbestos and malignant pleural mesothelioma, and in Mexico the major type of asbestos is chrysotile imported from Canada,” the researchers said.

They said deaths from mesothelioma appeared to be underreported in Mexico’s official death records, suggesting the scope of the problem was even greater. Of more than 100 patients diagnosed with mesothelioma, only about a third of patients who had died had mesothelioma listed as a cause of death.

In 2006, the World Health Organization said that all types of asbestos cause mesothelioma, lung cancer and asbestosis and there is no safe level of exposure to asbestos. Even if use of asbestos is eliminated soon, the World Health Organization has estimated there will be 5 to 10 million additional deaths from asbestos. The World Health Organization called for a ban.

But Mexico has not banned asbestos. To the contrary, Mexico’s government supported an effort by asbestos-exporting countries, led by Canada, to block the United Nations from including chrysotile asbestos on a list of recognized toxic substances.

Based of their findings, the researchers called on Mexico to ban the use and commercialization of all forms of asbestos to protect future generations and to require asbestos manufacturers and importers to pay the medical expenses and pensions of diseased workers. The researchers said if asbestos is not banned at once in Mexico, the incidence of mesothelioma would continue to increase in the population for 50 years.

Higher Mortality Among Chrysotile Asbestos Miners in Italy, Study Says

• Nancy Meredith
• Asbestos Exposure, International News, Mesothelioma

Italian researchers found an elevated incidence of mesothelioma in a study of more than 1,000 miners who worked at an asbestos mine near Turin, Italy. Their findings were reported in the scientific journal Occupational and Environmental Medicine.

The Balangero mine, located near Turin, Italy, used to be Europe’s largest open pit asbestos mine. By the 1970s, the mine produced 130,000 to 160,000 tons per year of chrysotile asbestos. It closed in 1990, two years before Italy banned the mining, marketing and use of all types of asbestos including Chrysotile because of the human health hazards.

Medical researchers have been tracking the mine’s former workers to understand better the long-term health effects of breathing asbestos dust. Asbestos-related diseases such as malignant mesothelioma, a cancer of the lining of the lungs or abdomen closely linked to inhaling asbestos fibers, typically don’t appear until decades after exposure.

In the 2009 study in the scientific journal Occupational and Environmental Medicine, researchers from four Italian medical institutions reported a significantly higher than expected death rate from pleural and peritoneal mesothelioma among the Balangero miners. All of the cases of mesothelioma occurred more than 30 years after exposure, and two occurred more than 50 years later. Four of the five cases involved miners exposed to asbestos dust for more than 20 years.

The study expands on earlier published research that found an increased risk of oral, laryngeal and pleural cancers among the Balangero asbestos miners, based on health information and mortality data through 1987. The new research tracks 1,056 miners for 16 additional years —through 2003.

The researchers computed expected mortality rates from certain cancers and other causes of death in the province of Turin and throughout Italy. They then compared the expected rates to the actual mortality among the workers employed at the mines starting in 1946 and later. They found four times as many deaths from pleural mesothelioma as expected and increased mortality for pleural and peritoneal cancer combined.

The study also supports a recent conclusion by the U.S. Institute of Medicine that there is sufficient evidence to support an association between asbestos and laryngeal cancer. The study found a greater than 80 percent increased number of deaths from larynegeal cancer above the norm.

Overall, the researchers found excess mortality among the Balangero mine workers from asbestos-related diseases including mesothelioma, lung cancer and asbestosis as well as other alcohol-related conditions such as cirrhosis of the liver.

Residents Near Asbestos Plant at 26 Times Greater Risk of Mesothelioma, Study Says

• Nancy Meredith
• Asbestos Exposure, Featured News, International News, Mesothelioma

By Wade Rawlins

Much remains to be learned about environmental exposure to asbestos and the incidence of mesothelioma among people who have only “second hand” exposure such as families of asbestos workers or people who live near asbestos companies. That is a focus of new research in Libby, Montana where vermiculite ore tainted with asbestos has caused a high rate of asbestos-related disease. It’s also the subject of recently completed research from Egypt.

A study published by researchers in Egypt earlier this year examined environmental exposure to asbestos near Cairo, Egypt and the link to malignant pleural mesothelioma, a rare cancer of the lining of the lungs. The study appeared in the Eastern Mediterranean Health Journal, a publication of the World Health Organization.

http://www.who.int/mediacentre/factsheets/fs343/en/

The prevalence of mesothelioma, an incurable cancer, has been increasing throughout the industrialized world with the incidence predicted to peak around 2020, the study said. A number of studies have linked exposure to airborne asbestos fibers in the workplace to increased incidence of mesothelioma among workers employed in mining, textile manufacturing, insulation and asbestos cement factories. Families of asbestos workers and those living near asbestos mines and mills also are at increased risk of mesothelioma from environmental exposure, studies suggest.

The Egyptian researchers focused their study on Shubra El-Kheima, an industrial city at the northern edge of Cairo. For decades starting in 1948, the city had a large manufacturing plant that used chrysotile asbestos to make asbestos cement pipe and reinforced concrete products. In 2004, the Egyptian government decided to ban imports of asbestos and the plant closed.

While the plant was still operating full scale, the researchers obtained air samples inside the plant and in neighborhoods up to about 2 miles away. That allowed the researchers to calculate more precisely the amount of asbestos fibers that workers and residents were inhaling and then to estimate the relationship between levels of exposure and rates of mesothelioma.

Researchers did health screenings including x-rays on 487 workers in the plant and on 2,913 residents living in six communities in the vicinity of the plant. They found that about 3 percent of people exposed to asbestos living near the plant had malignant mesothelioma while about 1 percent of the workers did. Both rates exceed the norm. (Because mesothelioma takes 30 to 40 years to appear, it’s not surprising that the number of workers at the plant with the disease was not larger.)

Researchers said a significant finding of the study was that people exposed to asbestos in the environment were at 26 times greater risk of developing mesothelioma than people in a more distant neighborhood, who had no known environmental asbestos exposure nearby.

The community of El-Wehda El-Arabia, directly downwind of the plant, had the highest concentration of asbestos fibers in air samples and also had the highest incidence of mesothelioma among residents of the six communities studied, the researchers found. Thirty-nine residents had malignant pleural mesothelioma.

Researchers also found a correlation between length of exposure to asbestos and rates of mesothelioma. The more years residents were exposed to asbestos, the greater the likelihood of having the disease with a significant increase for those with 40 years or more of exposure. More than 60 percent of the residents with mesothelioma were women, the researchers. They attributed that to their long residence in the area.

The researchers said the study had an important message: the mesothelioma threat will remain for years to come and doctors should look for early signs of mesothelioma in people who had had environmental exposure to mesothelioma.

• Read the study
  http://www.emro.who.int/emhj-list/emhj-volume-15-2009/volume15-issue1.html