Hi Cat; I think the cyberknife people will be able to help your sister. If the tumor is less than 4 cm and there is no lymph node activity, she should be ok. I had a 7 cm tumor with my ck and they could not give me the full strength dose. We were hoping to just get stability or shrinkage and not get collateral damage. I got pneumonitis anyway. It is still unclear if the ck is affecting my tumor, but it probably did not stop it. My tumor is an unusual one in that it resists treatment at every step. I am sure you sister would have very good results.
Don M