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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">Oncohematology</journal-id><journal-title-group><journal-title xml:lang="en">Oncohematology</journal-title><trans-title-group xml:lang="ru"><trans-title>Онкогематология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1818-8346</issn><issn publication-format="electronic">2413-4023</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">938</article-id><article-id pub-id-type="doi">10.17650/1818-8346-2024-19-3-68-78</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>NEW DIRECTIONS, DIAGNOSTIC OPPORTUNITIES, AND TREATMENT ADVANCES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>НОВЫЕ НАПРАВЛЕНИЯ, ВОЗМОЖНОСТИ ДИАГНОСТИКИ И УСПЕХИ ЛЕЧЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Complement C3 inhibitor in patients with paroxysmal nocturnal hemoglobinuria with suboptimal response to C5 inhibitor therapy</article-title><trans-title-group xml:lang="ru"><trans-title>Ингибитор комплемента С3 у пациентов с пароксизмальной ночной гемоглобинурией при субоптимальном ответе на терапию ингибитором С5</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-2740-4590</contrib-id><name-alternatives><name xml:lang="en"><surname>Marchenko</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Марченко</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><bold>Maria V. Marchenko </bold></p><p><italic>6–8 L’va Tolstogo St., Saint Petersburg 197022</italic></p></bio><bio xml:lang="ru"><p><bold>Мария Викторовна Марченко</bold></p><p><italic>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</italic></p></bio><email>mv_bogomolova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7238-729X</contrib-id><name-alternatives><name xml:lang="en"><surname>Klimova</surname><given-names>O. U.</given-names></name><name xml:lang="ru"><surname>Климова</surname><given-names>О. У.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>6–8 L’va Tolstogo St., Saint Petersburg 197022</italic></p></bio><bio xml:lang="ru"><p><italic>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Anikina</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Аникина</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>55 Kotovskogo St., Tyumen 625023</italic></p></bio><bio xml:lang="ru"><p><italic>625023 Тюмень, ул. Котовского, 55</italic></p></bio><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0287-5161</contrib-id><name-alternatives><name xml:lang="en"><surname>Lapina</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Лапина</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>6–8 L’va Tolstogo St., Saint Petersburg 197022</italic></p></bio><bio xml:lang="ru"><p><italic>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4601-7495</contrib-id><name-alternatives><name xml:lang="en"><surname>Rudakova</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Рудакова</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>6–8 L’va Tolstogo St., Saint Petersburg 197022</italic></p></bio><bio xml:lang="ru"><p><italic>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3017-6632</contrib-id><name-alternatives><name xml:lang="en"><surname>Ksenzova</surname><given-names>T. I.</given-names></name><name xml:lang="ru"><surname>Ксензова</surname><given-names>Т. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>55 Kotovskogo St., Tyumen 625023</italic></p></bio><bio xml:lang="ru"><p><italic>625023 Тюмень, ул. Котовского, 55</italic></p></bio><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9589-4136</contrib-id><name-alternatives><name xml:lang="en"><surname>Kulagin</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Кулагин</surname><given-names>А. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>6–8 L’va Tolstogo St., Saint Petersburg 197022</italic></p></bio><bio xml:lang="ru"><p><italic>197022 Санкт-Петербург, ул. Льва Толстого, 6–8</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Raisa Gorbacheva Memorial Research Institute for Pediatric Oncology, Hematology and Transplantation, I.P. Pavlov First Saint Petersburg State Medical University, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">НИИ детской онкологии, гематологии и трансплантологии им. Р.М. Горбачевой ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет им. акад. И.П. Павлова» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Regional Clinical Hospital No. 1</institution></aff><aff><institution xml:lang="ru">ГБУЗ ТО «Областная клиническая больница № 1»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-09-03" publication-format="electronic"><day>03</day><month>09</month><year>2024</year></pub-date><volume>19</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>68</fpage><lpage>78</lpage><history><date date-type="received" iso-8601-date="2024-09-01"><day>01</day><month>09</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-09-01"><day>01</day><month>09</month><year>2024</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://oncohematology.abvpress.ru/ongm/article/view/938">https://oncohematology.abvpress.ru/ongm/article/view/938</self-uri><abstract xml:lang="en"><p>The introduction of the complement component C5 inhibitor eculizumab has radically changed the prognosis and quality of life of patients with paroxysmal nocturnal hemoglobinuria. Up to 30 % of patients develop only a suboptimal response to C5 inhibition. One reason for this is activation of extravascular hemolysis, due to opsonization of erythrocytes with fragments of the C3 component. Pegcetacoplan, the first ever registered C3 inhibitor, is aimed at solving this problem.</p><p>In Russia, 2 patients received pegcetacoplan as part of a phase 3, randomized, open-label, active-comparator controlled trial PEGASUS. The analysis includes data from the first year of therapy: the run-in period (pegcetacoplan 1080 mg SC twice weekly in addition to the current dose of eculizumab, 4 weeks), the randomized controlled period (both patients were randomized to eculizumab monotherapy, 16 weeks), and the open-label period of pegcetacoplan therapy (32 weeks). Data from the extension study to evaluate the long-term safety and efficacy of pegcetacoplan are also presented. The duration of follow-up on pegcetacoplan therapy in both patients exceeded 4 years.</p></abstract><trans-abstract xml:lang="ru"><p>Внедрение в практику ингибитора компонента С5 комплемента экулизумаба радикально улучшило прогноз и качество жизни пациентов с пароксизмальной ночной гемоглобинурией. У 30 % больных отмечается лишь субоптимальный ответ на ингибицию С5. Одной из причин этого является активация внесосудистого гемолиза за счет опсонизации эритроцитов фрагментами компонента С3. Пэгцетакоплан – первый зарегистрированный в мире ингибитор С3, направленный на решение данной проблемы.</p><p>В России 2 пациента получили терапию пэгцетакопланом в рамках рандомизированного многоцентрового открытого контролируемого исследования III фазы PEGASUS. В анализ включены данные первого года лечения: вводный период (пэгцетакоплан 1080 мг 2 раза в неделю подкожно в дополнение к текущей дозе экулизумаба, 4 нед), рандомизированный контролируемый период (оба пациента рандомизированы на монотерапию экулизумабом, 16 нед) и открытый период терапии пэгцетакопланом (32 нед). Представлены результаты расширенного исследования для оценки долгосрочной безопасности и эффективности пэгцетакоплана. Продолжительность наблюдения за обоими пациентами на фоне терапии пэгцетакопланом превысила 4 года.</p></trans-abstract><kwd-group xml:lang="en"><kwd>paroxysmal nocturnal hemoglobinuria</kwd><kwd>complement C5 inhibitor</kwd><kwd>suboptimal response</kwd><kwd>complement C3 inhibitor</kwd><kwd>pegcetacoplan</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>пароксизмальная ночная гемоглобинурия</kwd><kwd>ингибитор комплемента С5</kwd><kwd>субоптимальный ответ</kwd><kwd>ингибитор комплемента С3</kwd><kwd>пэгцетакоплан</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Some of the clinical and laboratory data presented in this publication were obtained from the PEGASUS and APL2-307 clinical trial conducted by Apellis Pharmaceuticals, Inc. (USA)</funding-statement><funding-statement xml:lang="ru">Частично клинические и лабораторные данные, представленные в публикации, получены в рамках клинических исследований PEGASUS и APL2-307, организованных компанией «Апеллис Фармасьютикалс, Инк.» (США)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Socié G., Mary J.Y., de Gramont A. et al. Paroxysmal nocturnal haemoglobinuria: long-term follow-up and prognostic factors. French Society of Haematology. Lancet 1996;348(9027):573–7. DOI: 10.1016/s0140-6736(95)12360-1</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Brodsky R.A., Mukhina G.L., Nelson K.L. et al. Resistance of paroxysmal nocturnal hemoglobinuria cells to the glycosylphosphatidylinositol-binding toxin aerolysin. Blood 1999;93(5):1749–56.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Hillmen P., Bessler M., Mason P.J. et al. 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