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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="research-article" 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">1005</article-id><article-id pub-id-type="doi">10.24287/j.1005</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CLINICAL OBSERVATIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ НАБЛЮДЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Relapses of acute lymphoblastic leukemia in children with t(1;19)(q23;p13) translocation: a case series</article-title><trans-title-group xml:lang="ru"><trans-title>Рецидивы острого лимфобластного лейкоза у детей с транслокацией (1;19)(q23;p13): серия клинических наблюдений</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1389-5566</contrib-id><name-alternatives><name xml:lang="en"><surname>Amelina</surname><given-names>K. I.</given-names></name><name xml:lang="ru"><surname>Амелина</surname><given-names>К. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Hematologist at the Admissions Department; Research Student at the Department of Oncology, Hematology and Radiation Therapy of the Institute of Motherhood and Childhood</p></bio><bio xml:lang="ru"><p>врач-гематолог приемного отделения; аспирант кафедры онкологии, гематологии и лучевой терапии Института материнства и детства </p></bio><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8725-7532</contrib-id><name-alternatives><name xml:lang="en"><surname>Dyakonova</surname><given-names>Y. Y.</given-names></name><name xml:lang="ru"><surname>Дьяконова</surname><given-names>Ю. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7959-3512</contrib-id><name-alternatives><name xml:lang="en"><surname>Vavilova</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Вавилова</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5201-6475</contrib-id><name-alternatives><name xml:lang="en"><surname>Abugova</surname><given-names>Y. G.</given-names></name><name xml:lang="ru"><surname>Абугова</surname><given-names>Ю. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3247-8688</contrib-id><name-alternatives><name xml:lang="en"><surname>Chugaeva</surname><given-names>L. K.</given-names></name><name xml:lang="ru"><surname>Чугаева</surname><given-names>Л. Х.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2801-7421</contrib-id><name-alternatives><name xml:lang="en"><surname>Evstratov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Евстратов</surname><given-names>Д. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0520-5630</contrib-id><name-alternatives><name xml:lang="en"><surname>Shelikhova</surname><given-names>L. N.</given-names></name><name xml:lang="ru"><surname>Шелихова</surname><given-names>Л. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7265-0414</contrib-id><name-alternatives><name xml:lang="en"><surname>Khachatryan</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Хачатрян</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4779-1896</contrib-id><name-alternatives><name xml:lang="en"><surname>Myakova</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Мякова</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>amelinaki@yandex.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><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="aff2"><aff><institution xml:lang="en">The Russian Children’s Clinical Hospital of the N.I. Pirogov Russian National Research Medical University of Ministry of Healthcare of the Russian Federation</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Российский национальный исследовательский медицинский университет им. Н.И. Пирогова» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-04-14" publication-format="electronic"><day>14</day><month>04</month><year>2026</year></pub-date><volume>25</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>145</fpage><lpage>150</lpage><history><date date-type="received" iso-8601-date="2025-08-26"><day>26</day><month>08</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-02-05"><day>05</day><month>02</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2026</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/1005">https://hemoncim.com/jour/article/view/1005</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> The (1;19)(q23;p13) translocation, which generates the <italic>TCF3::PBX1</italic> fusion gene, is detected in 3–5% of patients with acute lymphoblastic leukemia (ALL). In cases of relapse, the disease often demonstrates aggressive and refractory behavior, including the development of extramedullary sites. Defining the optimal sequence and combination of therapeutic approaches in this genetic subgroup requires further investigation and standardization on the basis of accumulated clinical data.</p> <p><bold>Aim:</bold> to describe the clinical patterns of ALL relapse in children with the (1;19)(q23;p13) translocation and to analyze outcomes according to relapse site and disease course.</p> <p><bold>Materials and methods.</bold> We conducted a retrospective descriptive analysis of seven pediatric ALL relapse cases harboring the (1;19)(q23;p13) translocation. We analyzed the clinical manifestations of relapses, the sequence of salvage therapy, and outcomes at last follow-up. For a more detailed analysis, two cases with opposite outcomes were selected: one with a durable second remission and another with a progressive, incurable disease.</p> <p><bold>Results.</bold> At the time of analysis, sustained remission was achieved in only 1 out of 7 patients. In 3 cases, treatment options were exhausted and these patients were transitioned to a palliative level of care. At the time of manuscript preparation, 2 patients were undergoing hematopoietic stem cell transplantation, and 1 patient was receiving maintenance therapy.</p> <p><bold>Conclusion.</bold> This case series highlights the need for individualized management of relapsed ALL in this genetic subgroup, including targeted and cell therapies, local control strategies, and updating risk stratification models.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Транслокация (1;19)(q23;p13), приводящая к формированию химерного гена<italic> TCF3::PBX1</italic>, встречается у 3–5% пациентов с острым лимфобластным лейкозом (ОЛЛ). В случае развития рецидива заболевание нередко демонстрирует агрессивное и рефрактерное течение, в том числе с развитием экстрамедуллярных очагов. Выбор оптимальной последовательности и комбинации лечебных подходов в данной генетической подгруппе требует дальнейших исследований и стандартизации на основе накопленных клинических данных.</p> <p><bold>Цель исследования</bold> – описать клинические варианты рецидивов ОЛЛ у детей с транслокацией (1;19)(q23;p13) и проанализировать исходы в зависимости от локализации рецидива и особенностей течения заболевания.</p> <p><bold>Материалы и методы.</bold> Проведен ретроспективный описательный анализ 7 клинических наблюдений рецидивов ОЛЛ у детей с транслокацией (1;19)(q23;p13). Проанализированы клинические варианты рецидивов, последовательность противорецидивной терапии и исходы на момент последнего наблюдения. Для более детального анализа были выбраны 2 случая с полярными исходами: устойчивой второй ремиссией и прогрессирующим инкурабельным течением.</p> <p><bold>Результаты.</bold> Из 7 наблюдений стойкой ремиссии на момент анализа достиг только 1 пациент. В 3 случаях терапевтические опции были исчерпаны и ведение пациентов завершилось паллиативным статусом. Два пациента на момент подготовки рукописи находились на этапе проведения трансплантации гемопоэтических стволовых клеток и 1 пациент получал поддерживающую терапию.</p> <p><bold>Заключение.</bold> Обобщение представленного опыта подчеркивает необходимость индивидуализации подхода к лечению детей с рецидивами ОЛЛ в данной генетической группе, включая использование таргетной и клеточной терапии, локальных методов воздействия и пересмотра стратификационных моделей риска.</p></trans-abstract><kwd-group xml:lang="en"><kwd>acute lymphoblastic leukemia</kwd><kwd>(1</kwd><kwd>19)(q23</kwd><kwd>p13) translocation</kwd><kwd>TCF3::PBX1</kwd><kwd>relapse</kwd><kwd>immunotherapy</kwd><kwd>children</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>острый лимфобластный лейкоз</kwd><kwd>транслокация (1</kwd><kwd>19)(q23</kwd><kwd>p13)</kwd><kwd>TCF3::PBX1</kwd><kwd>рецидив</kwd><kwd>иммунотерапия</kwd><kwd>дети</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Duggan M.A., Anderson W.F., Altekruse S., Penberthy L., Sherman M.E. 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