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When researchers set out to study why glioblastoma strikes men more often than women, and kills them faster, they expected to find testosterone making things worse. However, they found the opposite.

A new study from the Cleveland Clinic, published in Nature, is turning long-held assumptions about male hormones and brain cancer on their head.We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.