Study to Understand the Course and Immune Effects of Progressive Multifocal Leukoencephalopathy PML

What this Trial Is About

Progressive multifocal leukoencephalopathy PML is a serious brain infection caused by the JC virus, which usually remains inactive in most people but can become active if the immune system is weakened due to disease or medication. The study aims to understand the natural history and effects of PML on the immune system by following patients with PML and individuals at risk, alongside healthy volunteers. Participants include those with suspected or confirmed PML, individuals with impaired immune function who may be at risk for PML, and healthy volunteers. The study involves multiple visits including an initial visit, monthly visits for six months, a 12-month visit, and possible additional visits. During these visits, participants undergo physical exams, neurological tests, brain imaging, and provide blood, urine, and spinal fluid samples. Optional procedures may include bone marrow samples and skin biopsies. No treatment is provided as part of the study. Participants will be monitored over time with detailed clinical and imaging assessments to collect data on the diseases course and immune response. The research includes evaluating viral behavior, immune markers, and genetic factors. The main measurement focuses on characterizing patients at one year after enrollment, with follow-up assessments to track progression. This long-term observation helps to develop tools for earlier diagnosis and better management of PML.

Natural History Study of Progressive Multifocal Leukoencephalopathy (PML)