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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">975</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2025-24-1-167-174</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Acute myeloid leukemia with translocations involving the <italic>KMT2A</italic> gene in twins as a model for the study of leukemogenesis: clinical case reports and genetic characteristics</article-title><trans-title-group xml:lang="ru"><trans-title>Острый миелоидный лейкоз с транслокациями, вовлекающими ген <italic>КМТ2А</italic>, у близнецов как модель для исследования лейкемогенеза: описание клинических случаев и генетические характеристики</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-6838-0963</contrib-id><name-alternatives><name xml:lang="en"><surname>Askerova</surname><given-names>Z. Z.</given-names></name><name xml:lang="ru"><surname>Аскерова</surname><given-names>З. З.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Zakhra Z. Askerova - a hematologist at the Inpatient Facility for Short-Term Treatment.</p><p>1 Samory Mashela St., 117997, Moscow</p></bio><bio xml:lang="ru"><p>Аскерова Захра Зауровна - врач-гематолог стационара кратковременного лечения.</p><p>117997, Москва, ул. Саморы Машела, 1</p></bio><email>azzi19.99@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9634-5828</contrib-id><name-alternatives><name xml:lang="en"><surname>Zerkalenkova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Зеркаленкова</surname><given-names>Е. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1719-1726</contrib-id><name-alternatives><name xml:lang="en"><surname>Lebedeva</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Лебедева</surname><given-names>С. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6001-2746</contrib-id><name-alternatives><name xml:lang="en"><surname>Iskakova</surname><given-names>K. S.</given-names></name><name xml:lang="ru"><surname>Искакова</surname><given-names>К. С.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0183-1530</contrib-id><name-alternatives><name xml:lang="en"><surname>Venyov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Венёв</surname><given-names>Д. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1258-8281</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrova</surname><given-names>U. N.</given-names></name><name xml:lang="ru"><surname>Петрова</surname><given-names>У. Н.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7130-8596</contrib-id><name-alternatives><name xml:lang="en"><surname>Baydildina</surname><given-names>D. D.</given-names></name><name xml:lang="ru"><surname>Байдильдина</surname><given-names>Д. Д.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2689-0569</contrib-id><name-alternatives><name xml:lang="en"><surname>Balashov</surname><given-names>D. N.</given-names></name><name xml:lang="ru"><surname>Балашов</surname><given-names>Д. Н.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0694-3996</contrib-id><name-alternatives><name xml:lang="en"><surname>Bronin</surname><given-names>G. O.</given-names></name><name xml:lang="ru"><surname>Бронин</surname><given-names>Г. О.</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="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1649-6774</contrib-id><name-alternatives><name xml:lang="en"><surname>Tomilin</surname><given-names>I. Ya.</given-names></name><name xml:lang="ru"><surname>Томилин</surname><given-names>И. Я.</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="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4244-7110</contrib-id><name-alternatives><name xml:lang="en"><surname>Natrusova</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Натрусова</surname><given-names>М. 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="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3277-9018</contrib-id><name-alternatives><name xml:lang="en"><surname>Gaskova</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Гаськова</surname><given-names>М. 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="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Soldatkina</surname><given-names>O. I.</given-names></name><name xml:lang="ru"><surname>Солдаткина</surname><given-names>О. И.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2352-7716</contrib-id><name-alternatives><name xml:lang="en"><surname>Olshanskaya</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Ольшанская</surname><given-names>Ю. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1085-4646</contrib-id><name-alternatives><name xml:lang="en"><surname>Kazakova</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Казакова</surname><given-names>А. Н.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0889-6986</contrib-id><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>А. М.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5220-7412</contrib-id><name-alternatives><name xml:lang="en"><surname>Kashpor</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Кашпор</surname><given-names>С. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8228-4876</contrib-id><name-alternatives><name xml:lang="en"><surname>Dubrovina</surname><given-names>M. E.</given-names></name><name xml:lang="ru"><surname>Дубровина</surname><given-names>М. Э.</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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6271-7435</contrib-id><name-alternatives><name xml:lang="en"><surname>Konyukhova</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Конюхова</surname><given-names>Т. 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="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0016-6698</contrib-id><name-alternatives><name xml:lang="en"><surname>Maschan</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Масчан</surname><given-names>А. 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="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">Morozov Children’s Clinical Hospital of the Department of Health of Moscow</institution></aff><aff><institution xml:lang="ru">ГБУЗ г. Москвы «Морозовская детская городская клиническая больница Департамента здравоохранения г. Москвы»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-08" publication-format="electronic"><day>08</day><month>04</month><year>2025</year></pub-date><volume>24</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>167</fpage><lpage>174</lpage><history><date date-type="received" iso-8601-date="2025-03-28"><day>28</day><month>03</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-03-28"><day>28</day><month>03</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2025</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/975">https://hemoncim.com/jour/article/view/975</self-uri><abstract xml:lang="en"><p>Familial cases of acute leukemia in children are very rare and are mainly reported in cases of genetically determined predisposition syndromes (mutations in the RUNX1, ETV6, ANKRD26, GATA2, SAMD9/SAMD9L, CEBPA genes) which have been well characterized in the last 15 years. In twins, leukemia is even more rare and is of particular interest for the study of leukemogenesis patterns and evolution of leukemic subclones. Here, we report about three pairs of twins: in one pair, KMT2A-r-leukemia was diagnosed simultaneously, while in the other two cases the second child remained healthy despite the development of KMT2A-r-leukemia in their twin. The patients’ parents gave consent to the use of their children's data, including photographs, for research purposes and in publications.</p></abstract><trans-abstract xml:lang="ru"><p>Семейные случаи острых лейкозов у детей встречаются очень редко и главным образом описаны в рамках генетически детерминированных синдромов предрасположенности (мутации в генах RUNX1, ETV6, ANKRD26, GATA2, SAMD9/SAMD9L, CEBPA), которые хорошо охарактеризованы за последние 15 лет. Лейкозы у близнецов встречаются еще реже и представляют особый интерес с точки зрения изучения закономерностей лейкемогенеза и эволюции лейкемических субклонов. В данной работе мы приводим описание трех пар близнецов с различными сценариями развития/неразвития острого лейкоза: в одной паре КМТ2А-r-ассоциированный лейкоз был диагностирован одновременно, в двух других второй ребенок остается здоровым, несмотря на развитие КМТ2А-r-ассоциированного лейкоза у близнеца. Родители пациентов дали согласие на использование информации, в том числе фотографий детей, в научных исследованиях и публикациях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>acute leukemia</kwd><kwd>acute myeloid leukemia</kwd><kwd>twins</kwd><kwd>children</kwd><kwd>t(1</kwd><kwd>11)(q21</kwd><kwd>q23)/KMT2A::MLLT11</kwd><kwd>t(6</kwd><kwd>11)(q27</kwd><kwd>q23)/ KMT2A::AFDN</kwd><kwd>t(11</kwd><kwd>19)(q23</kwd><kwd>p13.1)/KMT2A::ELL</kwd><kwd>KMT2A gene</kwd><kwd>concordance</kwd><kwd>discordance</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>острые лейкозы</kwd><kwd>острый миелоидный лейкоз</kwd><kwd>близнецы</kwd><kwd>дети</kwd><kwd>t(1</kwd><kwd>11)(q21</kwd><kwd>q23)/ KMT2A::MLLT11</kwd><kwd>t(6</kwd><kwd>11)(q27</kwd><kwd>q23)/KMT2A::AFDN</kwd><kwd>t(11</kwd><kwd>19)(q23</kwd><kwd>p13.1)/KMT2A::ELL</kwd><kwd>ген KMT2A</kwd><kwd>конкордантность</kwd><kwd>дискордантность</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проведено при поддержке фонда «Наука – детям»</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Tarlock K., Cooper T.M. 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