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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">619</article-id><article-id pub-id-type="doi">10.25692/ACEN.2019.4.7</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">Natalizumab-associated progressive multifocal leukoencephalopathy in patients with multiple sclerosis: risk reduction, management and possibilities for subsequent immunoregulation</article-title><trans-title-group xml:lang="ru"><trans-title>Натализумаб-ассоциированная прогрессирующая мультифокальная лейкоэнцефалопатия у пациентов с рассеянным склерозом: пути снижения риска, тактика ведения и возможности последующей иммунорегуляции</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khachanova</surname><given-names>Natalia V.</given-names></name><name xml:lang="ru"><surname>Хачанова</surname><given-names>Наталья Валерьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Boyko</surname><given-names>Alexey N.</given-names></name><name xml:lang="ru"><surname>Бойко</surname><given-names>Алексей Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shumilina</surname><given-names>Maria V.</given-names></name><name xml:lang="ru"><surname>Шумилина</surname><given-names>Мария Васильевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smagina</surname><given-names>Inna V.</given-names></name><name xml:lang="ru"><surname>Смагина</surname><given-names>Инна Вадимовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Malkova</surname><given-names>Nadezhda A.</given-names></name><name xml:lang="ru"><surname>Малкова</surname><given-names>Надежда Алексеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff5"/><xref ref-type="aff" rid="aff6"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sivertseva</surname><given-names>Stella A.</given-names></name><name xml:lang="ru"><surname>Сиверцева</surname><given-names>Стелла Анатольевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff7"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popova</surname><given-names>Ekaterina V.</given-names></name><name xml:lang="ru"><surname>Попова</surname><given-names>Екатерина Валерьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff8"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Khaibullin</surname><given-names>Timur I.</given-names></name><name xml:lang="ru"><surname>Хайбуллин</surname><given-names>Тимур Ильдусович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>voroba.nat@mail.ru</email><xref ref-type="aff" rid="aff9"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Pirogov Russian National Research Medical University</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Российский национальный исследовательский медицинский университет им. Н.И. Пирогова»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Federal Center for Cerebrovascular Pathology and Stroke</institution></aff><aff><institution xml:lang="ru">ФГБУ "Федеральный центр цереброваскулярной патологии и инсульта"</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">City Clinical Hospital No. 31</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Городская клиническая больница № 31</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Altai State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Алтайский государственный медицинский университет»</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Novosibirsk State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Новосибирский государственный медицинский университет»</institution></aff></aff-alternatives><aff-alternatives id="aff6"><aff><institution xml:lang="en">State Novosibirsk Regional Clinical Hospital</institution></aff><aff><institution xml:lang="ru">ГБУЗ НСО "Государственная Новосибирская областная клиническая больница"</institution></aff></aff-alternatives><aff-alternatives id="aff7"><aff><institution xml:lang="en">Health Unit «Neftyanik»</institution></aff><aff><institution xml:lang="ru">АО «Медико-санитарная часть ‟Нефтяникˮ»</institution></aff></aff-alternatives><aff-alternatives id="aff8"><aff><institution xml:lang="en">City Clinical Hospital No. 24</institution></aff><aff><institution xml:lang="ru">ГБУЗ "Городская клиническая больница №24" Департамента здравоохранения города Москвы</institution></aff></aff-alternatives><aff-alternatives id="aff9"><aff><institution xml:lang="en">Republican Clinical Neurological Center</institution></aff><aff><institution xml:lang="ru">ГАУЗ «Республиканский клинический неврологический центр»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-12-26" publication-format="electronic"><day>26</day><month>12</month><year>2019</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>46</fpage><lpage>53</lpage><history><date date-type="received" iso-8601-date="2019-12-26"><day>26</day><month>12</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Khachanova N.V., Boyko A.N., Shumilina M.V., Смагина I.V., Malkova N.A., Sivertseva S.A., Popova E.V., Khaibullin T.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Khachanova N.V., Boyko A.N., Shumilina M.V., Смагина I.V., Malkova N.A., Sivertseva S.A., Popova E.V., Khaibullin T.I.</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Khachanova N.V., Boyko A.N., Shumilina M.V., Смагина I.V., Malkova N.A., Sivertseva S.A., Popova E.V., Khaibullin T.I.</copyright-holder><copyright-holder xml:lang="ru">Khachanova N.V., Boyko A.N., Shumilina M.V., Смагина I.V., Malkova N.A., Sivertseva S.A., Popova E.V., Khaibullin T.I.</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/619">https://annaly-nevrologii.com/pathID/article/view/619</self-uri><abstract xml:lang="en"><p>The risk of progressive multifocal leukoencephalopathy (PML) is one of the factors limiting the widespread use of natalizumab (NTZ). As a strategy for potentially reducing the frequency of the NTZ-associated PML, while maintaining the high therapy efficacy, in addition to the widely-used risk stratification strategy based on anti-JC virus antibody index and therapy duration, we propose the administration of NTZ with an extended dosing interval. Opinions vary on the effectiveness of plasmapharesis in confirmed cases of PML. The most challenging problem is how to manage patients, who develop PML, and what MS disease-modifying therapy should be considered for the subsequent use.</p></abstract><trans-abstract xml:lang="ru"><p>Риск развития прогрессирующей мультифокальной лейкоэнцефалопатии (ПМЛ) является одним из факторов, ограничивающих широкое применение натализумаба (НТЗ). В качестве стратегии потенциального снижения частоты НТЗ-ассоциированной ПМЛ при сохранении высокой эффективности терапии в дополнение к широко используемой стратификации риска, основанной на индексе антител к JC-вирусу и длительности терапии, было предложено введение НТЗ с расширенным интервалом дозирования. В отношении эффективности плазмафереза, в случае подтверждения диагноза ПМЛ, существуют разные мнения. Наиболее сложным решением является дальнейшая тактика ведения пациентов, перенесших ПМЛ, и выбор последующей терапии препаратами, изменяющими течение рассеянного склероза.</p></trans-abstract><kwd-group xml:lang="en"><kwd>multiple sclerosis</kwd><kwd>natalizumab</kwd><kwd>progressive multifocal leukoencephalopathy</kwd><kwd>plasmapheresis</kwd><kwd>extended dosing intervals</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рассеянный склероз</kwd><kwd>натализумаб</kwd><kwd>прогрессирующая мультифокальная лейкоэнцефалопатия</kwd><kwd>плазмаферез</kwd><kwd>расширенные интервалы дозирования</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Díaz C., Zarco L., Rivera D.M. Highly active multiple sclerosis: An update. Mult Scler Relat Disord 2019; 30: 215–224. DOI: 10.1016/j.msard.2019.01.039. 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