Leptomeningeal Disease

This study is a prospective evaluation of systemic, intravenous high-dose methotrexate (HD-MTX, 8 g/m2) in patients with triple negative, HER2-positive, and hormone refractory breast cancer with leptomeningeal metastasis (LMD) with or without brain parenchymal involvement.

To learn if gadopiclenol (a contrast agent) used during MRI scanning can help in the detection of early LMD.

The planned multicenter register is intended to create a database in the form of a cancer register on the incidence and course of disease in Germany of leptomeningeal disease, the therapeutic measures administered in the real world and the complications.

The purpose of this research study is to test the safety and effectiveness of a cell therapy at different doses for children and young adults with recurrent or progressive brain tumors. Recurrent/recurred means a tumor that has gone away and then came back. This cell therapy is called B7- H3.CD28Z.CART, referred to as B7-H3 CAR T cells. B7-H3 is a protein that is over-expressed on many tumor cells, making it a good target for cancer cell therapy. The names of the study investigational therapies involved in this study are: * Fludarabine (a type of chemotherapy) * Cyclophosphamide (a type of chemotherapy) * B7-H3 CAR T cells (a type of cellular therapy)

The goal of this clinical trial is to evaluate the efficacy of tucatinib and capecitabine in combination with intrathecal trastuzumab on overall survival rate at 12 months in HER2-positive metastatic breast cancer (MBC) patients with proven leptomeningeal evolution and requiring intrathecal therapy.

To determine the safety of intrathecal (IT) PD1 antibody for Intrathecal application of PD1 antibody in metastatic solid tumors with leptomeningeal disease of solid tumors.

The goal of this project is to develop and validate a reproducible scorecard for the neurological assessment of patients with leptomeningeal metastases that can be used in clinical trials including such patients, as well as in clinical practice.