[Review of progressive multifocal leukoencephalopathy]

Area of Science:

• Neurology
• Virology
• Immunology

Context:

• Progressive multifocal leukoencephalopathy (PML) is a rare, fatal demyelinating disease of the central nervous system.
• PML is caused by the reactivation of the JC virus (JCV) in immunocompromised individuals.
• The prevalence of PML has increased significantly, particularly in patients with acquired immunodeficiency syndrome (AIDS).

Purpose:

• To review the current understanding of PML, its association with AIDS, and epidemiological trends.
• To highlight the challenges in treating PML and the importance of immune reconstitution.
• To emphasize the need for improved diagnostic and therapeutic strategies for PML.

Summary:

• PML is a severe neurological condition resulting from JC virus reactivation, predominantly affecting individuals with compromised cellular immunity, such as those with AIDS.
• While combined antiretroviral therapy (cART) can improve immune status in AIDS-PML patients, it does not directly treat PML, and deficits are often permanent.
• The Japanese epidemiological survey indicates a rising incidence of AIDS-associated PML.

Impact:

• PML poses a significant threat to immunocompromised populations, necessitating urgent development of effective treatments.
• Early detection through improved diagnostic modalities is crucial for potentially better patient outcomes.
• Further research into specific anti-JCV therapies and immune-based strategies is essential for combating PML.