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Graduates’ brain risk

PEOPLE with at least three years of higher education are at greater risk for cancerous brain tumours than those with no more than nine years of schooling, perplexed researchers said last month.

“There is a 19 per cent increased risk that university-educated men could be diagnosed with glioma,” said Amal Khanolkar, a scientist at the Institute of Child Health (ICH) in London and lead author of a study in the Journal of Epidemiology and Community.


For women, the risk rose by 23 per cent.

“It was a surprising result, which is difficult to explain,” Khanolkar said. In reality, the increase in risk is minimal because such brain tumours are rare.

At the lowest level of education, the chances of glioma were reported at five in 3,000.

At the other end of the educational spectrum, the odds increased to six in 3,000. But the question remained as to whether the gap was real and, if so, what caused it.

Earlier research exploring a possible link between education or social level, on the one hand, and the frequency of brain tumours, on the other, had been inconclusive.

To “put to rest” conflicting findings, Khanolkar and colleagues at Karolinska Institutet medical university in Stockholm used a new approach. Rather than comparing a small number of brain tumour patients with healthy individuals, they sifted through the health records of 4.3 million adults tracked by the Swedish public health system from 1993 to 2011.

The researchers distinguished between three kinds of brain tumours – two of them non-cancerous – with different causes. The strong link between education level and tumour incidence held for all three types, but was strongest for deadly gliomas. An even higher risk gap was found between lowincome manual labourers and high-income men and women who did not work with their hands.

Gliomas are malignant brain tumours that grow rapidly and cause severe symptoms, including migraines, nausea and memory loss. The survival rate is very low. The study did not seek to explain the link between higher education and tumours, nor did it

consider the potential impact of environmental and lifestyle factors, such as smoking or alcohol consumption. The most common explanation for risk levels that rise with years spent in the classroom is that people with a higher education or income “have

a better awareness of symptoms,” Khanolkar concluded. This would mean they are more likely to seek help and receive a correct diagnosis. But while this may be true in a country with a health system that clearly favours the well-to-do, the argument is far less convincing in the Swedish context, the researchers said.

“Sweden has a universal, tax-based health care system,” said Khanolkar. Everybody has roughly the same access to treatment. Moreover, gliomas form very rapidly – often within 48 hours – and are excruciatingly painful. “The symptoms are not avoidable – you can’t sit at home and not seek care,” he said.

The team will canvass an updated version of the database for possible correlations between ethnicity and brain tumour risk. Underlying genetic variation in populations from different geographic regions could be a factor, Khanolkar acknowledged.

One expert, commenting on the study, pointed to other possible culprits. “Two additional factors which might be of interest are height and, in women, hormone replacement therapy (HRT),” said James Green, a clinical epidemiologist at the University of Oxford.

“Risk of brain tumours – as of most cancers – is higher in taller people, and taller people tend to be richer and more educated,” he noted. “

HRT increases risk of brain tumours, and its use varies by socio-economic group.”

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