Study of Chronic Viral Infections in the Central Nervous System Using Immune Checkpoint Inhibitors Observing Patients With Progressive Multifocal Leukoencephalopathy and Other CNS Viral Diseases

What this Trial Is About

Researchers are conducting a real-world observational cohort study to understand chronic viral infections in the central nervous system CNS, such as Progressive Multifocal Leukoencephalopathy PML. The study aims to evaluate whether immune checkpoint inhibitors, a type of drug, improve long-term outcomes for patients with these infections. Both patients with existing follow-up data and newly diagnosed patients will be enrolled to gather comprehensive information. Participants will be grouped into two cohorts an ambidirectional cohort for those with prior follow-up data and a prospective cohort for newly diagnosed cases. The study involves monitoring patients over time without assigning treatments, focusing on observing their health and response to any use of immune checkpoint inhibitors. Participants will be followed for at least one year after disease onset, with regular assessments including neurological function tests using the Modified Rankin Scale mRS, neuroimaging scans, and cerebrospinal fluid tests to detect viral DNA. Evaluations occur at one month, then every three months, to measure symptoms and neurological changes. This comprehensive monitoring helps researchers understand disease progress and treatment impact over time.

Observational Cohort Study of Chronic Viral Infection in the Central Nervous System