Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Observational
Official Title: A Prospective, Observational Trial on the Diagnostic and Prognostic Value of Cell-free DNA in Advanced Lung Cancer With Leptomeningeal Metastases
Brief Summary: The primary purpose of this study is to compare the positive rate between the cell-free DNA and cytological examination of cerebrospinal fluid in Advanced lung cancer with leptomeningeal metastases.