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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">10.21682/2311-1267-2026-13-1-52-59</article-id><article-id custom-type="elpub" pub-id-type="custom">nodgo-1263</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>Применение белумосудила у детей со стероид-рефрактерной хронической реакцией «трансплантат против хозяина»: объединенный опыт девяти центров Российской Федерации</article-title><trans-title-group xml:lang="en"><trans-title>Belumosudil in the treatment of steroid-refractory chronic graft-versus-host disease in children: the combined experience of nine centers of the Russian Federation</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4456-2369</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Быкова</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bykova</surname><given-names>Т. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., заместитель директора</p><p>197022, Санкт-Петербург, ул. Льва Толстого, 6–8</p></bio><bio xml:lang="en"><p>Cand. of Sci. (Med.), Deputy Director for Pediatrics of the Raisa Gorbacheva Memorial Research Institute of Children Oncology, Hematology and Transplantation</p><p> </p></bio><email xlink:type="simple">dr.bykova@mail.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/0000-0002-2945-284X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Киргизов</surname><given-names>К. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kirgizov</surname><given-names>K. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., заместитель директора по научной работе НИИ детской онкологии и гематологии им. акад. РАМН Л.А. Дурнова</p><p>115522, Москва, Каширское шоссе, 23</p></bio><bio xml:lang="en"><p>Cand. of Sci. (Med.), Deputy Director for Scientific Work of Research Institute of Pediatric Oncology and Hematology named after Academician of the Russian Academy of Medical Sciences L.A. Durnov </p><p>23 Kashirskoe Shosse, Moscow, 115522</p></bio><email xlink:type="simple">k.kirgizov@ronc.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0179-2479</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Костарева</surname><given-names>И. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Kostareva</surname><given-names>I. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-детский онколог отделения детской трансплантации костного мозга и гемопоэтических стволовых клеток НИИ детской онкологии и гематологии им. акад. РАМН Л.А. Дурнова</p><p>115522, Москва, Каширское шоссе, 23</p></bio><bio xml:lang="en"><p>Pediatric Oncologist of Department of Pediatric Bone Marrow and Hematopoietic Stem Cell Transplantation</p><p>23 Kashirskoe Shosse, Moscow, 115522</p></bio><email xlink:type="simple">kostareva_92@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><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>врач-гематолог, и. о. заведующего отделением трансплантации костного мозга и гемопоэтических стволовых клеток</p><p>119049, Москва, 4-й Добрынинский пер., 1/9</p></bio><bio xml:lang="en"><p>Acting Head of the Bone Marrow and Hematopoietic Stem Cell Transplantation Department </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-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1861-4380</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Климов</surname><given-names>Н. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Klimov</surname><given-names>N. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-детский онколог отделения трансплантации костного мозга и гемопоэтических стволовых клеток</p><p>119049, Москва, 4-й Добрынинский пер., 1/9</p></bio><bio xml:lang="en"><p>Pediatric Oncologist of the Bone Marrow and Hematopoietic Stem Cell Transplantation Department</p><p>1/9 4th Dobryninskiy Per., Moscow, 119049</p></bio><email xlink:type="simple">nazar11081@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0566-053X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Скворцова</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Skvortsova</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.м.н., врач-гематолог, заместитель заведующего отделением трансплантации гемопоэтических стволовых клеток № 2</p><p>117997, Москва, Саморы Машела, 1</p></bio><bio xml:lang="en"><p>Dr. of Sci. (Med.), Hematologist, Deputy Head of the Hematopoietic Stem Cell Transplantation Department No. 2 </p><p>1 Samory Mashela St., Moscow, 117997</p></bio><email xlink:type="simple">yuscvo@mail.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2247-9337</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Молостова</surname><given-names>О. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Molostova</surname><given-names>O. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-детский онколог, заместитель заведующего отделением трансплантации гемопоэтических стволовых клеток № 1</p><p>117997, Москва, Саморы Машела, 1</p></bio><bio xml:lang="en"><p>Pediatric Oncologist of the Deputy Head, Hematopoietic Stem Cell Transplantation Department No. 1 </p><p>1 Samory Mashela St., Moscow, 117997</p></bio><email xlink:type="simple">olga.molostova@gmail.com</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6129-2647</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Антошин</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Antoshin</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-гематолог, и.о. заведующего отделением гематологии и химиотерапии № 1</p><p>119571, Москва, Ленинский просп., 117</p></bio><bio xml:lang="en"><p>Hematologist, Acting Head of the Hematology and Chemotherapy Department No. 1 </p><p>117 Leninskiy Prosp., Moscow, 117997</p></bio><email xlink:type="simple">lfechina@mail.ru</email><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1885-3912</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фечина</surname><given-names>Л. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Fechina</surname><given-names>L. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., заместитель главного врача по онкологии и гематологии, ведущий научный сотрудник лаборатории клеточной терапии онкогематологических заболеваний</p><p>620149, Екатеринбург, ул. Серафимы Дерябиной, 32</p></bio><bio xml:lang="en"><p>Cand. of Sci. (Med.), Deputy Chief Physician for Oncology and Hematology, Leading Researcher at the Laboratory of Cell Therapy for Oncohematological Diseases </p><p>32 Serafimy Deryabinoy St., Yekaterinburg, 620149</p></bio><email xlink:type="simple">lfechina@mail.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-7644-1486</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вахонина</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vakhonina</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-детский онколог</p><p>620149, Екатеринбург, ул. Серафимы Дерябиной, 32</p></bio><bio xml:lang="en"><p>Pediatric Oncologist </p><p>32 Serafimy Deryabinoy St., Yekaterinburg, 620149</p></bio><email xlink:type="simple">vakhonina_larisa@mail.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4108-6600</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Федюкова</surname><given-names>Ю. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedyukova</surname><given-names>Yu. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-гематолог, заведующая детским гематологическим отделением</p><p>197758, Санкт-Петербург, пос. Песочный, ул. Ленинградская, 68</p></bio><bio xml:lang="en"><p>Head, Pediatric Hematology Department</p><p>68 Leningradskaya St., Pesochny, Saint Petersburg, 197758</p></bio><email xlink:type="simple">vig1982@inbox.ru</email><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2003-0982</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Диникина</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Dinikina</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.м.н., доцент, заведующая отделением химиотерапии онкогематологических заболеваний и трансплантации костного мозга для детей</p><p>197341, Санкт-Петербург, ул. Аккуратова, 2</p></bio><bio xml:lang="en"><p>Dr. of Sci. (Med.), Associate Professor, Head of the Department of Chemotherapy for Hematologic Diseases and Bone Marrow Transplantation for Children </p><p>2 Akkuratova St., Saint Petersburg, 197341</p></bio><email xlink:type="simple">dinikina_yuv@almazovcentre.ru</email><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-7516-9482</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Голубева</surname><given-names>К. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Golubeva</surname><given-names>K. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>врач-детский онколог отделения химиотерапии онкогематологических заболеваний и трансплантации костного мозга у детей</p><p>197341, Санкт-Петербург, ул. Аккуратова, 2</p></bio><bio xml:lang="en"><p>Pediatric Oncologist at the Department of Chemotherapy for Hematologic Diseases and Bone Marrow Transplantation for Children </p><p>2 Akkuratova St., Saint Petersburg, 197341</p></bio><email xlink:type="simple">golubeva_km@almazovcentre.ru</email><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9697-806X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кадричева</surname><given-names>Т. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kadricheva</surname><given-names>T. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., врач-гематолог, врач-детский онколог отделения онкологии и гематологии</p><p>660074, Красноярск, ул. Академика Киренского, 2а</p></bio><bio xml:lang="en"><p>Cand. of Sci. (Med.), Hematologist, Pediatric Oncologist of the Department of Oncology and Hematology </p><p>2a Akademika Kirenskogo St., Krasnoyarsk, 660074</p></bio><email xlink:type="simple">otkm24@mail.ru</email><xref ref-type="aff" rid="aff-9"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2594-7703</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зубаровская</surname><given-names>Л. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Zubarovskaya</surname><given-names>L. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.м.н., профессор, заместитель директора по трансплантации</p><p>197022, Санкт-Петербург, ул. Льва Толстого, 6–8</p></bio><bio xml:lang="en"><p>Dr. of Sci. (Med.), Professor, Deputy Director for Transplantation of the Raisa Gorbacheva Memorial Research Institute of Children Oncology, Hematology and Transplantation</p><p>6–8 Lev Tolstoy St., Saint Petersburg, 197022</p></bio><email xlink:type="simple">zubarovskaya_ls@mail.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/0000-0002-9589-4136</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кулагин</surname><given-names>А. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Kulagin</surname><given-names>А. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.м.н., профессор, директор</p><p>197022, Санкт-Петербург, ул. Льва Толстого, 6–8</p></bio><bio xml:lang="en"><p>Dr. of Sci. (Med.), Professor, Director of the Raisa Gorbacheva Memorial Research Institute of Children Oncology, Hematology and Transplantation</p><p>6–8 Lev Tolstoy St., Saint Petersburg, 197022</p></bio><email xlink:type="simple">kulagingem@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Научно-исследовательский институт детской онкологии, гематологии и трансплантологии имени Р.М. Горбачевой ФГБОУ ВО «Первый Санкт-Петербургский государственный медицинский университет имени академика И.П. Павлова» Минздрава России<country>Россия</country></aff><aff xml:lang="en">Raisa Gorbacheva Memorial Research Institute of Children Oncology, Hematology and Transplantation, First Pavlov State Medical University of St. Petersburg, Ministry of Health of Russi<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">ФГБУ «НМИЦ онкологии им. Н.Н. Блохина» Минздрава России<country>Россия</country></aff><aff xml:lang="en">N.N. Blokhin National Medical Research Centre of Oncology, Ministry of Health of Russia<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">ГБУЗ «Морозовская детская клиническая больница Департамента здравоохранения города Москвы»<country>Россия</country></aff><aff xml:lang="en">Morozov Children's City Clinical Hospital of the Department of Health of Moscow<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru">ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России<country>Россия</country></aff><aff xml:lang="en">Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Ministry of Health of Russia<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru">Российская детская клиническая больница – филиал ФГАОУ ВО РНИМУ им. Н.И. Пирогова Минздрава России<country>Россия</country></aff><aff xml:lang="en">Russian Children’s Clinical Hospital – Branch of the N.I. Pirogov Russian National Research Medical University, Ministry of Health of Russia<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-6"><aff xml:lang="ru">ГАУЗ СО «Областная детская клиническая больница № 1»<country>Россия</country></aff><aff xml:lang="en">Sverdlovsk Regional Children’s Clinical Hospital No. 1<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-7"><aff xml:lang="ru">ФГБУ «НМИЦ онкологии им. Н.Н. Петрова» Минздрава России<country>Россия</country></aff><aff xml:lang="en">N.N. Petrov National Medical Research Center of Oncology, Ministry of Health of Russia<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-8"><aff xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр имени В.А. Алмазова» Минздрава России<country>Россия</country></aff><aff xml:lang="en">Almazov National Medical Research Centre, Ministry of Health of Russia<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-9"><aff xml:lang="ru">КГБУЗ «Красноярский краевой клинический центр охраны материнства и детства»<country>Россия</country></aff><aff xml:lang="en">Krasnoyarsk Regional Clinical Center for Maternal and Child Health<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>03</day><month>04</month><year>2026</year></pub-date><volume>13</volume><issue>1</issue><fpage>52</fpage><lpage>59</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Быкова Т.А., Киргизов К.И., Костарева И.О., Бурцев Е.А., Климов Н.С., Скворцова Ю.В., Молостова О.О., Антошин М.М., Фечина Л.Г., Вахонина Л.В., Федюкова Ю.Г., Диникина Ю.В., Голубева К.М., Кадричева Т.Г., Зубаровская Л.С., Кулагин А.Д., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Быкова Т.А., Киргизов К.И., Костарева И.О., Бурцев Е.А., Климов Н.С., Скворцова Ю.В., Молостова О.О., Антошин М.М., Фечина Л.Г., Вахонина Л.В., Федюкова Ю.Г., Диникина Ю.В., Голубева К.М., Кадричева Т.Г., Зубаровская Л.С., Кулагин А.Д.</copyright-holder><copyright-holder xml:lang="en">Bykova Т.A., Kirgizov K.I., Kostareva I.O., Burtsev E.A., Klimov N.S., Skvortsova Y.V., Molostova O.O., Antoshin M.M., Fechina L.G., Vakhonina L.V., Fedyukova Y.G., Dinikina Y.V., Golubeva K.M., Kadricheva T.G., Zubarovskaya L.S., Kulagin А.D.</copyright-holder><license 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/1263">https://journal.nodgo.org/jour/article/view/1263</self-uri><abstract><sec><title>Введение</title><p>Введение. Хроническая реакция «трансплантат против хозяина» (хрРТПХ) остается серьезным осложнением аллогенной трансплантации гемопоэтических стволовых клеток у детей. При стероид-рефрактерном течении прогноз по-прежнему неблагоприятный, а данные по применению селективного ингибитора ROCK2 белумосудила в педиатрической популяции, особенно младше 12 лет, ограничены.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проведен ретроспективный многоцентровый анализ 43 пациентов в возрасте ≤ 18 лет со стероидрефрактерной или стероид-зависимой хрРТПХ (критерии NIH 2014 г.), получавших белумосудил в девяти трансплантационных центрах Российской Федерации в период с 2023 по 2025 г. Дозу препарата определяли по массе тела пациента – от 50 до 200 мг/сут. Оценивали частоту и скорость достижения общего ответа (полный и частичный ответы), орган-специфическую эффективность, профиль безопасности, а также частоту редукции дозы, временных перерывов и отмены терапии.</p></sec><sec><title>Результаты</title><p>Результаты. Медиана возраста пациентов на момент начала терапии составила 12 лет (диапазон – 2–18 лет). Медиана предшествующих линий терапии – 3. Общий ответ достигнут у 65 % пациентов (28/43): полный – у 5 % (2/43), частичный – у 60 % (26/43). Наибольшая частота орган-специфических ответов зарегистрирована при поражении легких (79,5 %), желудочно-кишечного тракта (64 %), слизистой оболочки полости рта и глаз (65,5 % и 68,5 % соответственно). Медиана времени до ответа составила 35 дней. Нежелательные явления любой степени зафиксированы у 70 % пациентов, серьезные – у 37 %. Наиболее частыми были инфекционные осложнения (56 %), гематологическая (37 %) и печеночная (21 %) токсичность. Редукция дозы потребовалась у 35 % пациентов, временный перерыв – у 21 %, отмена терапии – у 19 %.</p></sec><sec><title>Заключение</title><p>Заключение. Белумосудил продемонстрировал клинически значимую эффективность и корректируемый профиль безопасности у педиатрических пациентов с тяжелой стероид-рефрактерной хрРТПХ, включая детей младше 12 лет. Полученные данные дополняют ограниченные мировые публикации по применению белумосудила в педиатрии и обосновывают целесообразность проведения проспективных исследований.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Chronic graft-versus-host disease (cGVHD) remains a serious complication of allogeneic hematopoietic stem cell transplantation in children. In steroid-refractory cases, the prognosis is still unfavorable, and data on the use of the selective ROCK2 inhibitor belumosudil in the pediatric population, particularly in children under 12 years of age, are limited.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. A retrospective multicenter analysis was conducted on 43 patients aged ≤ 18 years with steroid-refractory or steroiddependent cGVHD (2014 NIH criteria) who received belumosudil in 9 transplant centers across the Russian Federation between 2023 and 2025. The dose of the drug was determined by the patient's body weight, ranging from 50 to 200 mg/day. The evaluation included the rate and speed of achieving an overall response (complete and partial responses), organ-specific efficacy, safety profile, as well as the frequency of dose reduction, temporary interruptions, and treatment discontinuation.</p></sec><sec><title>Results</title><p>Results. The median age of patients at the start of therapy was 12 years (range: 2–18 years). The median number of prior lines of therapy was 3.</p><p>An overall response was achieved in 65 % of patients (28/43): a complete response in 5 % (2/43) and a partial response in 60 % (26/43). The highest rates of organ-specific responses were observed in lung involvement (79.5 %), gastrointestinal tract (64 %), oral mucosa, and eyes (65.5 % and 68.5 %, respectively). The median time to response was 35 days. Adverse events of any grade were reported in 70 % of patients, with serious events occurring in 37 %. The most frequent were infectious complications (56 %), hematological toxicity (37 %), and hepatotoxicity (21 %). Dose reduction was required in 35 % of patients, a temporary interruption in 21 %, and treatment discontinuation in 19 %.</p></sec><sec><title>Conclusion</title><p>Conclusion. Belumosudil demonstrated clinically significant efficacy and a manageable safety profile in pediatric patients with severe steroid-refractory cGVHD, including children under 12 years of age. The data obtained add to the limited global publications on the use of belumosudil in pediatrics and support the feasibility of conducting prospective studies.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>белумосудил</kwd><kwd>хроническая реакция «трансплантат против хозяина»</kwd><kwd>аллогенная трансплантация гемопоэтических стволовых клеток</kwd><kwd>дети</kwd><kwd>ROCK2-ингибитор</kwd></kwd-group><kwd-group xml:lang="en"><kwd>belumosudil</kwd><kwd>chronic graft-versus-host disease</kwd><kwd>allogeneic hematopoietic stem cell transplantation</kwd><kwd>children</kwd><kwd>ROCK2 inhibitor</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">Cooke K.R., Luznik L., Sarantopoulos S., Hakim F.T., Jagasia M., Fowler D.H., van den Brink M.R.M., Hansen J.A., Parkman R., Miklos D.B., Martin P.J., Paczesny S., Vogelsang G., Pavletic S., Ritz J., Schultz K.R., Blazar B.R. 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