"The newly published study suggests that variations in specific genes that have been linked to asthma, hay fever, and other allergic conditions may also be associated with a decreased risk for the brain tumor known as glioblastoma multiforme. Glioblastomas, or gliomas, are the most common type of brain cancers and are more common in the elderly. The tumor occurs in 13 out of 100,000 people over age 65, and the five-year survival rate in this age group is very low." (reference)