@carlies, I do know other stage IV patients who have had SBRT. The type of lung cancer that I have is treated with a targeted therapy (pills). The cancer eventually starts to find its way around the therapy, and we'll often see nodules that start to pop up throughout the body. Sometimes, if the number of nodules is low, a patient will continue to take the targeted therapy while the tumors are successfully treated with SBRT. We generally want to stay on the same therapy for as long as possible, because we know that someday we'll run out of treatment options. The longer we can stretch out one treatment, generally the better.