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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">nodgo</journal-id><journal-title-group><journal-title xml:lang="ru">Российский журнал детской гематологии и онкологии (РЖДГиО)</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Pediatric Hematology and Oncology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2311-1267</issn><issn pub-type="epub">2413-5496</issn><publisher><publisher-name>LTD “Graphica”</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21682/2311-1267-2022-9-3-42-47</article-id><article-id custom-type="elpub" pub-id-type="custom">nodgo-856</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL STUDIES</subject></subj-group></article-categories><title-group><article-title>МЕК-ингибиторы в терапии гистиоцитоза из клеток Лангерганса</article-title><trans-title-group xml:lang="en"><trans-title>MEK-inhibitors in treatment of Langerhans cell histiocytosis</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3623-6547</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бурцев</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Burtsev</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Евгений Андреевич Бурцев, врач-гематолог отделения ТКМ и ГСК.</p><p>SPIN-код: 7823-8533</p><p>119049, Москва, 4-й Добрынинский пер., 1/9</p></bio><bio xml:lang="en"><p>Hematologist HSCT and BMT Department. SPIN-code: 7823-8533</p><p>1/9 4th Dobryninskiy Per., Moscow, 119049</p></bio><email xlink:type="simple">burcev.evgeniy@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0694-3996</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бронин</surname><given-names>Г. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Bronin</surname><given-names>G. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., доцент, врач-гематолог, заведующий отделением ТТКМ и ГСК.</p><p>SPIN-код: 6485-2648</p><p>119049, Москва, 4-й Добрынинский пер., 1/9</p></bio><bio xml:lang="en"><p>Cand. of Sci. (Med.), Docent, Hematologist, Head of the HSCT and BMT Department. SPIN-code: 6485-2648</p><p>1/9 4th Dobryninskiy Per., Moscow, 119049</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ГБУЗ «Морозовская детская городская клиническая больница Департамента здравоохранения города Москвы»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Morozovskaya Children’s Clinical Hospital, Department of Health in Moscow</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>08</day><month>11</month><year>2022</year></pub-date><volume>9</volume><issue>3</issue><fpage>42</fpage><lpage>47</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Бурцев Е.А., Бронин Г.О., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Бурцев Е.А., Бронин Г.О.</copyright-holder><copyright-holder xml:lang="en">Burtsev E.A., Bronin G.O.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://journal.nodgo.org/jour/article/view/856">https://journal.nodgo.org/jour/article/view/856</self-uri><abstract><sec><title>Введение</title><p>Введение. В последние годы накоплен большой опыт применения таргетной терапии различных форм гистиоцитоза из клеток Лангерганса (ГКЛ) с использованием ингибиторов серин-треонин киназы, кодируемой геном BRAF (BRAF-ингибиторов), у пациентов с мутацией V600E в гене BRAF. При этом отсутствуют опубликованные результаты использования ингибиторов пути митоген-активируемой протеинкиназы MAPK/внеклеточной сигнал-регулируемой киназы ERK (МЕК-ингибиторов) у детей с ГКЛ с BRAF-негативными формами ГКЛ.</p><p>Цель исследования – оценка эффективности и безопасности применения МЕК-ингибитора кобиметиниба у детей с рефрактерным к программной терапии ГКЛ, у которых отсутствует мутация BRAF V600E.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. В исследование были включены 8 детей с различными формами ГКЛ, получавшие ранее программную химиотерапию по протоколу LCH-IV, у которых на фоне лечения или после его окончания отмечалась прогрессия основного заболевания. Оценка ответа на терапию проводилась в соответствии с международной шкалой Response Evaluation Criteria in Solid Tumours (RECIST v.1.1). Токсичность оценивали по критериям международной шкалы нежелательных побочных реакций Common Terminology Criteria for Adverse Events (СTCAE v.5.0).</p></sec><sec><title>Результаты</title><p>Результаты. Полного ответа на проводимую терапию не было получено ни у одного пациента. Частичный ответ отмечался у 5 из 8 больных. Спустя 3 мес после окончания терапии у 1 пациента была отмечена прогрессия заболевания. Терапия была ассоциирована с высокой частотой возникновения побочных реакций.</p></sec><sec><title>Заключение</title><p>Заключение. Кобиметиниб эффективен у BRAF V600E-негативных больных с рефрактерным течением ГКЛ. Ответ на проводимое лечение может быть отсрочен. Токсичность терапии носила дозозависимый характер, отмечалось ее исчезновение после коррекции дозы. Необходимо проведение дальнейших исследований в целях определения оптимальных дозировок, а также длительности проведения терапии.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. There are increasing data of targeted therapy efficacy of different types of Langerhans cell histiocytosis (LCH) with inhibitors of BRAF-specific serin-threonine kinase (BRAF-inhibitors) in cases with BRAF V600E mutation published last years. At the same time there are no published data of use of inhibitors of MAPK/ERK pathway (MEK-inhibitors) in pediatric patients with BRAF-negative forms of LCH.</p><p>Purpose of the study is to evaluate efficacy and safety of MEK-inhibitor (cobimetinib) in eight pediatric BRAF V600E-negative refractory LCH patients.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The study included 8 children with various forms of LCH. All patients received therapy according to the LCH-IV protocol and were diagnosed with progression of LCH during or after termination of the treatment. The response to the therapy was assessed in accordance with the international scale Response Evaluation Criteria in Solid Tumors (RECIST v.1.1). The assessment of the toxicity was performed in accordance with the international scale of Common Terminology Criteria for Adverse Events (CTCAE v.5.0).</p></sec><sec><title>Results</title><p>Results. Complete response was not achieved in any patient. Partial response was established in 5 cases. One patient was diagnosed with disease progression in three months after termination of the therapy. The incidence of adverse events was high.</p></sec><sec><title>Conclusion</title><p>Conclusion. Cobimetinib therapy is effective in BRAF V600E-negative refractory pediatric LCH patients. The response to the treatment can be delayed. All cases of the toxicity were dose depended and successfully resolved after dose correction. Further research is needed to define duration of treatment and optimal dosage.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>гистиоцитоз из клеток Лангерганса</kwd><kwd>МЕК-ингибиторы</kwd><kwd>кобиметиниб</kwd><kwd>таргетная терапия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Langerhans cell histiocytosis</kwd><kwd>MEK-inhibitors</kwd><kwd>cobimetinib</kwd><kwd>targeted therapy</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Rodriguez-Galindo C., Allen C.E. Langerhans cell histiocytosis. Blood. 2020;135(16):1319–31. doi: 10.1182/blood.201900093.</mixed-citation><mixed-citation xml:lang="en">Rodriguez-Galindo C., Allen C.E. Langerhans cell histiocytosis. 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