“…Also, the place of the second and third generation TKI's (EGFR: afatinib, AZD9291, CO-1686, ALK: ceritinib, alectinib) should be determined as these agents have a better penetration in the CSF compared to first generation TKI's and cranial responses are found with these agents in patients who develop brain metastases when they have already been treated with first generation TKI [15,[60][61][62]. Another option that could be explored in this patient population is the use of SRS without WBRT, even for multiple (five to ten) brain metastases.…”