This is a prospective translational observational study for patients with breast cancer leptomeningeal disease (LMD). LMD is notoriously difficult to treat, and prognosis is generally very poor, with most patients typically succumbing to the disease within a few months of its diagnosis. Conducting clinical trials is challenging for these reasons, and there are limited data regarding biological processes of LMD. The overarching goal of this study is to be as inclusive as possible to optimize and learn from patients with LMD. The investigators propose a prospective observational study to establish (1) a translational collection protocol to comprehensively collect tissue, blood, and CNS samples, and (2) a therapeutic management program utilizing the Johns Hopkins Molecular Tumor Board, to provide multi-disciplinary treatment recommendations in a timely manner, and (3) collect outcome data that can be correlated with biomarkers.
