Progressive multifocal leukoencephalopathy in HIV-1 infection

Area of Science:

• Neurovirology
• Immunology
• Infectious Diseases

Background:

• Progressive multifocal leukoencephalopathy (PML) is a severe opportunistic infection caused by the JC polyomavirus (JCV).
• PML is a feared complication of HIV-1 infection, often presenting with neurological deficits and demyelinating lesions on MRI.
• Diagnosis requires JCV identification in cerebrospinal fluid or brain tissue.

Purpose of the Study:

• To summarize the clinical presentation, diagnosis, and treatment outcomes of PML in HIV-1 patients.
• To highlight the impact of combined antiretroviral therapy (cART) on PML.
• To underscore the need for improved understanding and management strategies for PML.

Main Methods:

• Review of clinical presentations and diagnostic criteria for PML.
• Analysis of outcomes in HIV-1 patients treated with cART.
• Discussion of the immunological response and inflammatory lesions in PML.

Main Results:

• PML can occur in HIV-1 patients with higher CD4 counts and during cART.
• cART leads to clinical and MRI stabilization in 50-60% of patients, with JCV clearance.
• Inflammatory lesions develop in a significant proportion of patients, with variable outcomes.

Conclusions:

• While cART improves outcomes for many PML patients, significant variability exists.
• The underlying reasons for diverse natural history and treatment responses remain unclear.
• More targeted and rational management approaches for PML are essential.