Treatment
There is no known cure. In some cases, the disease slows or stops if the patient's immune system improves; some AIDS patients with PML have been able to survive for several years, with the advent of highly active antiretroviral therapy (HAART).
AIDS patients who start HAART after being diagnosed with PML tend to have a slightly longer survival time than patients who were already on HAART and then develop PML. A rare complication of effective HAART is immune reconstitution inflammatory syndrome (IRIS), in which increased immune system activity actually increases the damage caused by the infection; although IRIS is often manageable with other types of drugs, it is extremely dangerous if it occurs in PML.
Other antiviral agents that have been studied as possible treatments for PML include cidofovir and interleukin-2, but this research is still preliminary.
Cytarabine (also known as ARA-C), a chemotherapy drug used to treat certain cancers, has been prescribed on an experimental basis for a small number of non-AIDS PML patients. It is reported to have stabilized the neurological condition of a minority of these patients. One patient regained some cognitive function lost as a result of PML.
In June 2010, the first case report appeared of a PML patient being successfully treated with mefloquine. Mefloquine is an antimalarial drug that can also act against the JC virus. Administration of mefloquine seemed to eliminate the virus from the patient's body and prevented further neurological deterioration.
Read more about this topic: Progressive Multifocal Leukoencephalopathy
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