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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">Pediatric Hematology/Oncology and Immunopathology</journal-id><journal-title-group><journal-title xml:lang="en">Pediatric Hematology/Oncology and Immunopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Вопросы гематологии/онкологии и иммунопатологии в педиатрии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-1708</issn><issn publication-format="electronic">2414-9314</issn><publisher><publisher-name xml:lang="en">Fund Doctors, Innovations, Science for Children</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">850</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2024-23-1-192-199</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>LITERATURE REVIEW</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОБЗОР ЛИТЕРАТУРЫ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Clinical features and treatment of hemophilia B</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности клинического течения и терапии гемофилии В</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7074-0926</contrib-id><name-alternatives><name xml:lang="en"><surname>Zozulya</surname><given-names>N. I.</given-names></name><name xml:lang="ru"><surname>Зозуля</surname><given-names>Н. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Nadezhda I. Zozulya, Dr. Med. Sci., a hematologist, Headof the Department</p><p>Clinical and Diagnostic Department of Hematology and Hemostasis Disorders</p><p>125167; 4 Novy Zykovsky Proezd; Moscow</p></bio><bio xml:lang="ru"><p>Надежда Ивановна Зозуля, д-р мед. наук, врач-гематолог, заведующая отделением</p><p>клинико-диагностическое отделение гематологии и нарушений гемостаза</p><p>125167; Новый Зыковский проезд, 4; Москва</p></bio><email>zozulya.n@blood.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5649-325X</contrib-id><name-alternatives><name xml:lang="en"><surname>Andreeva</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Андреева</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Saint Petersburg</p></bio><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4384-6754</contrib-id><name-alternatives><name xml:lang="en"><surname>Zharkov</surname><given-names>P. A.</given-names></name><name xml:lang="ru"><surname>Жарков</surname><given-names>П. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-7912-3707</contrib-id><name-alternatives><name xml:lang="en"><surname>Vdovin</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Вдовин</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Moscow</p></bio><bio xml:lang="ru"><p>Москва</p></bio><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Medical Research Center for Hematology of of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр гематологии» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">City Center for the Treatment of Hemophilia Patients, City Outpatient Clinic No. 37</institution></aff><aff><institution xml:lang="ru">Городской центр по лечению больных гемофилией СПб ГБУЗ «Городская поликлиника № 37»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">The Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">The Morozov Children's City Clinical Hospital of the Department of Health of Moscow</institution></aff><aff><institution xml:lang="ru">ГБУЗ «Морозовская детская городская клиническая больница Департамента здравоохранения г. Москвы»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-04-19" publication-format="electronic"><day>19</day><month>04</month><year>2024</year></pub-date><volume>23</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>192</fpage><lpage>199</lpage><history><date date-type="received" iso-8601-date="2024-04-18"><day>18</day><month>04</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-04-18"><day>18</day><month>04</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">«D. Rogachev NMRCPHOI»</copyright-holder><copyright-holder xml:lang="ru">ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</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://hemoncim.com/jour/article/view/850">https://hemoncim.com/jour/article/view/850</self-uri><abstract xml:lang="en"><p>   Hemophilia B – a deficiency of blood coagulation factor IX (FIX) – is one of the most common hereditary coagulopathies along with hemophilia A and von Willebrand disease. As in hemophilia A, patients with hemophilia B require prophylactic treatment to prevent the development of bleeding and arthropathy, and there is a number of unsolved problems in their treatment. At the same time, the arsenal of drugs for the treatment of hemophilia B is significantly smaller compared to hemophilia A, and therefore the emergence of new drugs for the treatment of FIX deficiency is of great practical importance for doctors and patients. The article provides information about the pathogenesis and clinical course of hemophilia B, discusses the most promising areas in the treatment of this disease, such as innovative recombinant FIX molecules, rebalancing and gene therapy. In addition, we outlined clinical and laboratory criteria indicating the necessity to change treatment in patients with hemophilia B as well as presented clinical cases of patients who were switched to long-acting FIX products. The patients' parents gave their consent to the use of their children's data for research purposes and in publications.</p></abstract><trans-abstract xml:lang="ru"><p>   Гемофилия В – дефицит фактора свертывания крови IX (FIX) – наряду с гемофилией А и болезнью Виллебранда – является одной из наиболее часто встречающихся наследственных коагулопатий. Пациенты с гемофилией B так же, как и при гемофилии A, нуждаются в проведении профилактической терапии для предупреждения развития кровотечений и артропатий, а в их лечении отмечается целый ряд нерешенных проблем. При этом арсенал лекарственных препаратов для лечения гемофилии B существенно меньше по сравнению с гемофилией A, в связи с чем появление новых препаратов для терапии дефицита FIX имеет большое практическое значение для врачей и пациентов. В статье представлена информация об особенностях патогенеза и клинического течения гемофилии B, обсуждаются наиболее перспективные направления в лечении этого заболевания, такие как инновационные рекомбинантные молекулы FIX, ребалансирующая и генная терапия. Кроме того, обозначены клинические и лабораторные критерии необходимости смены терапии у пациентов с гемофилией B, а также представлены клинические случаи перевода на пролонгированный препарат FIX. Родители пациентов дали согласие на использование информации об их детях в научных исследованиях и публикациях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hemophilia B</kwd><kwd>blood coagulation factor IX</kwd><kwd>bleeding</kwd><kwd>deforming arthropathy</kwd><kwd>albutrepenonacog alfa</kwd><kwd>rebalancing therapy for hemophilia</kwd><kwd>gene therapy for hemophilia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гемофилия B</kwd><kwd>фактор свертывания крови IX</kwd><kwd>кровотечение</kwd><kwd>деформирующая артропатия</kwd><kwd>албутрепенонаког альфа</kwd><kwd>ребалансирующая терапия гемофилии</kwd><kwd>генная терапия гемофилии</kwd></kwd-group><funding-group><funding-statement xml:lang="en">Not specified</funding-statement><funding-statement xml:lang="ru">Не указан</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Clinical guidelines. Hemophilia. 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