A member asked:

Any ideas why most children have primary brain tumors and why do most adults have secondary brain tumors?

A doctor has provided 1 answer

Simply age: Cancer is very rare in children, and relatively common in adults. So children rarely have a "chance" to have a cancer elsewhere in the body which can spread to the brain, whereas adults have plenty of chances to acquire secondary brain tumors.

Answered 1/26/2014

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Thank

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