Non Interventional German Leptomeningeal Disease Register

This register is multicenter project in Germany. All patients eligible for this register are informed in detail about the register verbally and in writing by the treating and documenting physicians. The written declaration of consent is attached to the patient information form. A patient will only be included in this register once the written declaration of consent has been provided by the patient or their legal guardian. Patient information and the obtaining of consent forms are carried out by the treating medical colleagues.

The register's data sources are the diagnostic findings made at the center and doctors' letters from routine clinical practice. The participating sites carry out the assessment of the participants' performance status so that the patients do not have to complete any study-related questionnaires. There is no intervention in this trial: neither changes to medication nor interventions on the patient themselves are carried out. Invasive measures are not carried out and there is no health risk associated with participation. Within the project, only the occurrence and severity of a neoplastic central nervous system infestation as well as the respective therapeutic measures and their results are documented.

Planned start of register: Quarter 1 2024 Expected end of register: Quarter 4 2029. Once the patient or their legal guardian has given written consent, a patient will be included in the German Meningeosis neoplastica Register. Due to the rapid course of the disease and potential rapid deterioration, the documentation of the course of the disease of the individual patients is to be carried out retrospectively from the clinical routine data recorded during the course of the study for the entire duration of the study or until the death of the participating patients after the written consent of the patients.

There is no minimum or maximum number of patients to be enrolled in this trial. Only descriptive analyses are planned for the data documented in the register.

In accordance with the Declaration of Helsinki/Tokyo/Venice/Hong Kong, all patients have the right to discontinue their participation in the register at any time and without giving reasons, without losing their right to further treatment or experiencing disadvantages of any other kind as a result. The data is pseudonymized and can be decrypted using the separately maintained key list. If a patient subsequently withdraws their consent to participate and requests that the data be deleted, this can be done after decryption using the key list. As this is a pure register study without study intervention, there are no plans to discontinue the entire study.

• Frequency of adverse events during the course of the disease. [Срок оценки: through study completion, an average of 1 year]