Narelle Towie, Science Network WA
WA’s indigenous population has the highest rate of mesothelioma deaths in the world, with more than two-thirds of cases caused by asbestos mining in Wittenoom, researchers say.
Mesothelioma is one of the most aggressive and deadly types of cancer, killing people within months of diagnosis by attacking the lining of the lungs or abdomen.
A University of Western Australia study found 67 per cent of mesothelioma cases in WA’s Aboriginal population were a result of the mining of asbestos in the Pilbara town, compared with fewer than 25 per cent of cases in non-Aboriginals.
The disparity is not because of biological differences but rather because the indigenous population was predominantly exposed to crocidolite—also called blue asbestos and the most potent form, UWA epidemiologist Dr Peter Franklin says.
“So as a proportion, Wittenoom affected them [Aboriginal people] much more than it did non-Aboriginal people.”
The incidence rate—the number of cases relative to the population size—is much higher for Aboriginal people, Dr Franklin says.
“It puts them at the highest rate worldwide,” he says.
Twice as deadly
The study showed members of WA’s Aboriginal population die from mesothelioma at more than double the rate of people in the United Kingdom—which has the world’s highest national average.
The UWA team compared all cases of the asbestos-related cancer recorded in the WA Mesothelioma Register from 1960 to the end of 2013.
Nearly 7000 people, mostly men, mined blue asbestos from Wittenoom Gorge from the 1930s to 1966.
He says that the number could be even higher because people in remote areas may not have sought medical help.
Today, Wittenoom is a ghost town, closed down in 1966 because of health concerns and de-gazetted by the WA Government in 2007.
The landscape is littered with the microscopic asbestos fibres that, when inhaled, can pierce the lining of the lung, causing inflammation and releasing mutagens that promote tumour growth.
Dr Franklin warns that the number of Aboriginal cases may grow.
“The area around Wittenoom remains important to the Banyjima people, who continue to visit the gorge for swimming, fishing, cooking and cultural purposes,” the study says.
[hr] Source: Science Network WA