Leptomeningeal Metastasis of Breast Cancer

Evaluate the efficacy and safety of Intrathecal Administration of Thiotepa in Combination with Methotrexate via the Ommaya Reservoir in Breast Cancer with Leptomeningeal Metastasis

Central nervous system (CNS) metastases including breast cancer brain metastases (BCBMs) and leptomeningeal disease (LMD) are common affecting up to 30% of patients with metastatic breast cancer (MBC). The goal of this research is to understand symptom burden and quality of life trajectories in this population and how treatments guide care management decisions.

Traditional clinical trials in patients with breast cancer leptomeningeal disease (LMD) are challenging as patients often have a rapidly progressive course and prognosis is poor, making meeting standard eligibility difficult. Furthermore, there is limited information about the biology of LMD. The investigators thus propose a study that is as inclusive as possible, which will allow the investigators to collect biospecimens and clinical outcomes to learn more about LMD biology, but still potentially provide benefit for patients, by providing patients rapid diagnostics and multi-disciplinary treatment recommendations.