Efficacy of Tyrosine Kinase Inhibitors in ALK and EGFR-Mutated Non-Small Cell Lung Cancer with Brain Metastases

Background: Brain metastases (BMs) are a common and challenging complication of non-small cell lung cancer (NSCLC), historically associated with a poor prognosis. The development of targeted therapies, specifically tyrosine kinase inhibitors (TKIs) for epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) gene alterations, has significantly improved treatment outcomes. Methods: This article reports and evaluates the efficacy of different generations of TKIs for NSCLC with BMs. The primary endpoints assessed are intracranial objective response rates (IC-ORR), progression-free survival (PFS), and overall survival (OS). The analysis considers TKIs as monotherapy and in combination with radiotherapy. It also examines the impact of newer generation TKIs with enhanced blood–brain barrier (BBB) penetration on intracranial control. The report further discusses the integration of systemic therapy with local modalities like stereotactic radiosurgery (SRS) and the safety profiles of these agents, including central nervous system (CNS) and metabolic adverse events. Results: Newer generation TKIs demonstrate significantly enhanced BBB penetration, resulting in superior intracranial control compared to older generations. These agents show remarkable intracranial activity, contributing to improved IC-ORR, PFS, and OS. The optimal integration of systemic therapy with local modalities, such as SRS, is still under investigation. Treatment with these TKIs is associated with distinct safety profiles, including novel CNS and metabolic adverse events, which require careful management due to prolonged treatment durations. Conclusions: The management of CNS metastases in NSCLC is evolving towards more proactive and personalized therapeutic strategies. Newer generation TKIs have profoundly reshaped the treatment landscape by offering superior intracranial control. Further research is needed to determine the optimal integration of these systemic therapies with local modalities and to effectively manage the associated adverse events.