Treatments for Brain Metastases With Poor Prognostic Factors

The goal of this observational study is to learn about treatments in brain metastases with poor prognostic factors. The main questions it aims to answer are: * What kind of local treatment provides a survival benefit for patients with poor prognostic factors? * What kind of systemic treatment provides a survival benefit for patients with poor prognostic factors? * Will the combination of local treatment and systemic treatment provide a survival benefit for patients with poor prognostic factors? Participants will be asked to provide personal information about their living status, symptoms, and disease control during the follow-up.