Hi Boomer,
Yes, Cyberknife (CK) can be redone (one reason I chose it as my AN treatment option)... and I know of some that have been redone (for other intracranial tumors).
Please inquire to the docs on the CK Patient support board (
http://www.cyberknifesupport.org/forum/) as they are very well versed on all forms of radio-treatments (ie: GK, CK, etc as many of them perform multiple radio protocols) and they can further elaborate on which radio treatments can be redone, if necessary. Please keep in mind the high success rates of radio treatments such as CK and GK that to be "rezapped" is very small in numbers. Yes, it does/can occur, but the % have been extremely low.
If your question pertains to having radiation for other ails (ie: breast cancer, etc), then yes... you can have other radio treatments for those ailments as well. I'm lousy as describing the technical aspects/answers, but CK and GK use different kinds of rads in treatment vs. those treated with radio for cancers and such. Again, the docs there can better answer... and if you do a "search" here, you will find threads on it as well.
Hope that helps.
Phyl