RT Journal Article T1 Eculizumab-related progressive multifocal leukoencephalopathy A1 Gómez Cibera, Emilio A1 Ivanovic Barbeito, Yerko A1 Gutiérrez Martínez, Eduardo A1 Morales Ruiz, Enrique A1 Abradelo De Usera, Manuel A1 Hilario Barrio, Amaya A1 Ramos González, Ana A1 Ruíz Morales, Juan A1 Villarejo Galende, Alberto AB Progressive multifocal leukoencephalopathy (PML) is an opportunistic infection of the CNS caused by reactivation of the polyomavirus JC (JCV). In the context of immunosuppression, JCV can reactivate and spread to brain infecting oligodendrocytes. Eculizumab is a first-in-class humanized monoclonal antibody developed to target the cleavage of C5, preventing the release of C5a and activation of the terminal complement pathway. It has been shown to be effective in the treatment of paroxysmal nocturnal hemoglobinuria and atypical hemolytic uremic syndrome (aHUS). Eculizumab can impair neutro- phil and monocyte functions and predispose to encapsulated bacteria infections. We report the novel finding of PML in a patient receiving eculizumab. PB Wolters Kluwer YR 2015 FD 2015-12-30 LK https://hdl.handle.net/20.500.14352/115594 UL https://hdl.handle.net/20.500.14352/115594 LA eng NO Gómez-Cibeira E, Ivanovic-Barbeito Y, Gutiérrez-Martínez E, Morales E, Abradelo M, Hilario A, Ramos A, Ruiz-Morales J, Villarejo-Galende A. Eculizumab-related progressive multifocal leukoencephalopathy. Neurology. 2016 Jan 26;86(4):399-400. doi: 10.1212/WNL.0000000000002312. Epub 2015 Dec 30. PMID: 26718572; PMCID: PMC4776092. DS Docta Complutense RD 10 abr 2025