Outcomes of EGFR, ALK, ROS1, BRAF, MET, and RET mutated non-small cell lung cancer with brain metastases (NSCLC BM).

201 Background: Non-small cell lung cancer (NSCLC) is a leading cause of brain metastases. Advances in gene-directed therapies have shifted the focus away from traditional platinum-based chemotherapies. Key targeted mutations in NSCLC include EGFR, ALK, BRAF, MET exon skipping, RET fusions, and ROS1 rearrangements. This retrospective study aims to explore overall survival (OS) and progression-free survival (PFS) in NSCLC BM patients with these gene mutations. Methods: In this retrospective study, conducted by the Department of Medical Oncology at Beijing Tiantan Hospital and the First Medical Center, PLA General Hospital, we reviewed 1526 patients with NSCLC brain metastasis from 2010 to 2022. Data collected included molecular marker status, systemic therapies, and dates of progression. The analysis focused on determining OS and PFS from the time of brain metastasis diagnosis to the last follow-up or death. Statistical analysis used the Cox proportional hazards model. Results: The study reviewed 1526 patients, identifying the following mutation distribution: EGFR mutations in 628 patients, ALK rearrangements in 207 patients, ROS1 rearrangements in 64 patients, BRAF mutations in 31 patients, MET exon skipping in 55 patients, and RET fusions in 42 patients. Significant variations in median OS (mOS) and median PFS (mPFS) were observed across these mutation groups. Patients with EGFR and ALK mutations demonstrated longer mOS and mPFS. Patients with RET and ROS1 mutations also showed better outcomes compared to those with BRAF and MET mutations. Conclusions: This study highlights the importance of molecular mutations in NSCLC BM as prognostic indicators and therapeutic targets. EGFR and ALK mutations were associated with more favorable outcomes, emphasizing the need for personalized medicine in managing NSCLC BM. The study suggests further research focused on specific mutation types is crucial to refine treatment strategies and improve patient care.