If she had the so called gene for brain cancer would she have had her head surgically removed?
I dont buy the gene link at all to any modern diseases ! - in fact i beleive the gene link to cancers is pure misdirection and is a "secondary" mutation that is a result of our "primary" environment.
By primary environment I mean the air we breathe, the homes we live in, the chemicals we douse ourselves in, the water we drink, the pesticide laden food we eat, the chemicals and metals we have injected or placed in our teeth etc.