nsclc,stage4, brain surgery, cyberknife, chemo, now on Avastin - 1247465

Hi, I am writing about a loved one Doyle who was diagnosed Aug 2011 with Lung Cancer which had spread to his brain, He had sugery to remove the mass on Aug 23 followed by cyberknife 3treatments in Oct The lung mass increased in size between surgery and beginning of chemo. He then had also has 6 treatments of carboplatin and taxotere, with xgeva. He has been on Avastin as a maintence for a few months and so far it seems to be working well (also still recieving xgeva ). His lastest scan of his brain done last month showed no reoccurrance, his last scan on chest area on 8-2-12, showed no change in irregular right lobe mass measing 3x3.6 cm. ( was 2.5 ) When first found, There has been a increase in diameter of the left paratracheal lymph node from 12.7 to 16.7 mm., there has been a increase in size of the right hilar lymph node from 11.70 mm. in diameter to 12.5 mm. There has been a increase in size of the subcarinal lymph node from 8.8 mm. to 14.1 mm in diameter. Scattered bilateral lung parenchymal nodules unchanged. The oncologist mentioned yesterday he might want to use cyberknife again but this time on his lung mass, if he can do it while still recieving Avastin, What do you know about this, Is it being used now, what are possible side effects or problems with this? Would appreciate any info you can give. I am praying he can have the cyberknife becauce it has worked well with the brain area. Thank you for any help you can give.