Does lung cancer brain metastised tumors treated with the gamma knife extend survival if the tumors shrink and show no signs after a three month perio?

A good sign: The use of gamma knife to treat brain tumor suggests the brain lesion was a small? Was it only one lesion? Siezure, headache? Decadron (dexamethasone)? It is hard to tell about overall survival. It is encouraging to know that the tumor shrank after 3 months of treatment how much shrinking?I presume that you are talking about the lung lesions. Enjoy today, count your blessings, let tomorrow worry about itself.

Yes possible: Gamma radiation along with chemotherapy will give good palliation, extend the survival and quality of life unfortunately at this stage cure is rare.

Yes: Secondary analysis of a recent rtog trial showed that radiosurgery improved survival in lung cancer patients with disease metastatic to the brain. The longer you have gone without your tumor coming back the greater the chance that it will not come back, and the better the survival chances if it does come back.