Combination of Local Therapy and Target Therapy for Brain Metastases With EGFR Mutation

The goal of this observational study is to learn about the survival benefit of local therapy combination with target therapy in lung cancer brain metastases with EGFR mutation. The main questions it aims to answer are:Is local therapy performed before or after target therapy would provide survival benefit ?What kind of local therapy combining with target therapy would provide survival benefit, neurosurgical resection or radiotherapy?

Inclusion Criteria:Evidence of pathological diagnosis of primary tumor.Brain metastases confirmed by enhanced magnetic resonance imaging.Gene test indicated that EGFR mutation.Complete clinical information.Exclusion Criteria:If surgical treatment is accepted, the surgical treatment is not tumor resection, but ventricle puncture, biopsy and other non-tumor reducing surgery.Patients with 2 or more types of tumors.Incomplete clinical information.