What is the role of "adjuvant" systemic chemotherapy in patients previously resected NSCLC, now with isolated solitary relapsed brain lesion, treated with resection and SBRT?

Most of the data/publications for treating isolated, solitary lesions (brain or otherwise) revolve around the local therapy (stereotactic radiosurgery or conventional surgery for example), and there is not much data regarding the use of systemic therapy in this setting. There is a recent article sug...