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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Annals of Clinical and Experimental Neurology</journal-id><journal-title-group><journal-title xml:lang="en">Annals of Clinical and Experimental Neurology</journal-title><trans-title-group xml:lang="ru"><trans-title>Анналы клинической и экспериментальной неврологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2075-5473</issn><issn publication-format="electronic">2409-2533</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">552</article-id><article-id pub-id-type="doi">10.25692/ACEN.2018.4.9</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Reviews</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Обзоры</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Progressive multifocal leukoencephalopathy as a complication of disease-modifying treatment of multiple sclerosis</article-title><trans-title-group xml:lang="ru"><trans-title>Прогрессирующая мультифокальная лейкоэнцефалопатия как осложнение лечения препаратами, изменяющими течение рассеянного склероза</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zakharova</surname><given-names>Maria N.</given-names></name><name xml:lang="ru"><surname>Захарова</surname><given-names>Мария Николаевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Lysogorskaya@neurology.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lysogorskaia</surname><given-names>Elena V.</given-names></name><name xml:lang="ru"><surname>Лысогорская</surname><given-names>Елена Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Lysogorskaya@neurology.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanova</surname><given-names>Maria V.</given-names></name><name xml:lang="ru"><surname>Иванова</surname><given-names>Мария Васильевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Lysogorskaya@neurology.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kochergin</surname><given-names>Ivan А.</given-names></name><name xml:lang="ru"><surname>Кочергин</surname><given-names>Иван Александрович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Lysogorskaya@neurology.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korzhova</surname><given-names>Yulia E.</given-names></name><name xml:lang="ru"><surname>Коржова</surname><given-names>Юлия Евгеньевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Lysogorskaya@neurology.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Research Center of Neurology</institution></aff><aff><institution xml:lang="ru">ФГБНУ «Научный центр неврологии»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Research Сenter of Neurology</institution></aff><aff><institution xml:lang="ru">ФГБНУ «Научный центр неврологии»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2018-12-07" publication-format="electronic"><day>07</day><month>12</month><year>2018</year></pub-date><volume>12</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>62</fpage><lpage>66</lpage><history><date date-type="received" iso-8601-date="2018-12-14"><day>14</day><month>12</month><year>2018</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2018, Zakharova M.N., Lysogorskaia E.V., Ivanova M.V., Kochergin I.А., Korzhova Y.E.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2018, Zakharova M.N., Lysogorskaia E.V., Ivanova M.V., Kochergin I.А., Korzhova Y.E.</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="en">Zakharova M.N., Lysogorskaia E.V., Ivanova M.V., Kochergin I.А., Korzhova Y.E.</copyright-holder><copyright-holder xml:lang="ru">Zakharova M.N., Lysogorskaia E.V., Ivanova M.V., Kochergin I.А., Korzhova Y.E.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://annaly-nevrologii.com/pathID/article/view/552">https://annaly-nevrologii.com/pathID/article/view/552</self-uri><abstract xml:lang="en"><p>The review provides modern understanding of the pathogenesis of progressive multifocal leukoencephalopathy (PML), a severe and potentially fatal form of multiple-lesion disorder of the brain white matter. Information about the frequency of its development in patients with disease-modifying treatment of multiple sclerosis is analyzed. The algorithms of optimization of PML risks in this category of patients with multiple sclerosis are described in detail. Summarized are the data on most significant PML biomarkers, the search for which is currently under way in many centers across the world. The first case of PML in Russia is briefly described.</p></abstract><trans-abstract xml:lang="ru"><p>В обзоре дается современное представление о патогенезе прогрессирующей мультифокальной лейкоэнцефалопатии (ПМЛ) – тяжелой и потенциально фатальной формы многоочагового поражения белого вещества головного мозга. Анализируются сведения о частоте ее развития у пациентов с рассеянным склерозом, которые получают препараты, изменяющие течение заболевания. Подробно изложены алгоритмы оптимизации рисков развития ПМЛ у этой категории пациентов с рассеянным склерозом. Обобщены данные о наиболее значимых биомаркерах развития ПМЛ. Кратко описан первый зафиксированный случай развития ПМЛ в России.</p></trans-abstract><kwd-group xml:lang="en"><kwd>multiple sclerosis</kwd><kwd>progressive multifocal leukoencephalopathy</kwd><kwd>DMT</kwd><kwd>natalizumab</kwd><kwd>risk stratification.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рассеянный склероз</kwd><kwd>прогрессирующая мультифокальная лейкоэнцефалопатия</kwd><kwd>препараты, изменяющие течение рассеянного склероза</kwd><kwd>натализумаб</kwd><kwd>стратификация риска</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Zavalishin I.A., Zakharova M.N. [Multiple sclerosis: results and perspectives of the study]. Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova 1982; 82(2): 161–167. (In Russ.)</mixed-citation><mixed-citation xml:lang="ru">Завалишин И.А., Захарова М.Н. 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