They showed that people who went to university for at least three years faced a significantly higher risk of developing a malignant tumor called glioma than those with primary education.
In general, researchers established a link between a higher socioeconomic position and higher risk of suffering from glioma, although no definitive reason for this was given.
"Completeness of cancer registration and detection bias are potential explanations for the finding," researchers suggested.
The study was carried out among 4.3 million Swedes born in 1911-1961 and followed from 1993 to 2010. High-income people and those in non-manual occupations were also more likely to be diagnosed with a tumor than less well-off ones.