Wendy,
Hi,
Yes, Reiki may help folks manage stress more effectively and experience less severe side effects of chemo and\or radiation treatments. I would say, though, that longevity and especially freedom from recurrence would be the more critical parameters upon which the effectivieness of Reiki (an other alternative applications) need to be measured. And, certainly, more hospitals and hospices in the USA need "Reiki Rooms".
:)
Cheers,
RC