Failure of Cidofovir Therapy in Progressive Multifocal Leukoencephalopathy Unrelated to Human Immunodeficiency Virus

Abstract
We describe the first reported human immunodeficiency virus (HIV)-seronegative patient treated with cidofovir for progressive multifocal leukoencephalopathy (PML). Marked clinical and radiological progression of PML occurred during cidofovir therapy. The improvement observed during cidofovir therapy of HIV-infected patients may be due to the effect of concomitant antiretroviral therapy rather than cidofovir.

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