How about wearing a cap that kills newly divided cells to kill brain cancer?
It actually seems to...well...it doesn't cure cancer, but has been shown to increase survival time in patients with aggressive brain cancer. Of course, it's hideously expensive - but then, it's also brand new.
Fewer side effects than chemo, too. And even if it only gives somebody six more months, it's worth it.
Of course, we really need to prevent the cancer in the first place...