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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">480</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2021-20-1-46-53</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Immunophenotypic characterization of pediatric acute myeloid leukemia with inv(16)(p13.1q22)/t(16;16)(p13.1;q22)/CBFb-MYH11</article-title><trans-title-group xml:lang="ru"><trans-title>Иммунофенотипическая характеристика острого миелоидного лейкоза с inv(16)(p13.1q22)/t(16;16) (p13.1;q22)/CBFb-MYH11 у детей</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3450-0498</contrib-id><name-alternatives><name xml:lang="en"><surname>Mikhailova</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Михайлова</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Leukemia Immunophenotyping laboratory,</p><p>1 Samory Mashela St., Moscow 117997</p></bio><bio xml:lang="ru"><p>врач клинической лабораторной диагностики лаборатории иммунофенотипирования гемобластозов,</p><p>117997, Москва, ул. Саморы Машела, 1</p></bio><email>katmikhailova1805@gmail.com</email><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/0000-0001-9634-5828</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/0000-0002-7082-1694</contrib-id><name-alternatives><name xml:lang="en"><surname>Semchenkova</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Семченкова</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 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/0000-0002-2352-7716</contrib-id><name-alternatives><name xml:lang="en"><surname>Plyasunova</surname><given-names>S. A.</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/0000-0002-4503-0735</contrib-id><name-alternatives><name xml:lang="en"><surname>Olshanskaya</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Плясунова</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/0000-0002-0813-5626</contrib-id><name-alternatives><name xml:lang="en"><surname>Kalinina</surname><given-names>I. I.</given-names></name><name xml:lang="ru"><surname>Калинина</surname><given-names>И. 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/0000-0003-1735-0093</contrib-id><name-alternatives><name xml:lang="en"><surname>Maschan</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Масчан</surname><given-names>М. 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/0000-0002-0016-6698</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 contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2322-5734</contrib-id><name-alternatives><name xml:lang="en"><surname>Novichkova</surname><given-names>G. A.</given-names></name><name xml:lang="ru"><surname>Новичкова</surname><given-names>Г. 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/0000-0002-0889-6986</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-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">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><pub-date date-type="pub" iso-8601-date="2021-04-21" publication-format="electronic"><day>21</day><month>04</month><year>2021</year></pub-date><volume>20</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>46</fpage><lpage>53</lpage><history><date date-type="received" iso-8601-date="2021-04-16"><day>16</day><month>04</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-04-16"><day>16</day><month>04</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2021</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/480">https://hemoncim.com/jour/article/view/480</self-uri><abstract xml:lang="en"><p>The aim of this study was to describe the immunophenotype of leukemic cells in acute myeloid leukemia (AML) with inv(16) (p13.1q22)/CBFb-MYH11 and t(16;16)(p13.1;q22)/CBFb-MYH11 in children. This study is supported by the Independent Ethics Committee and approved by the Academic Council of the Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology. We investigated bone marrow samples from 36 pediatric patients with initially diagnosed AML with inv(16)(p13.1q22)/t(16;16)(p13.1;q22)/CBFb-MYH11. Immunophenotypic profile of leukemic cells was very heterogeneous: cells expressed antigens of early stages of differentiation (CD34, CD117, CD123) as well as markers of mature monocytes (CD11c, CD14, CD64) and neutrophils (CD65, CD15). Moreover, in 55.6% of cases lymphoid coexpressions were noticed (CD2 – the most frequent one). Furthermore, in 83.3% of cases we detected the separation of leukemic cells population into two parts: more “immature” – myeloblastic, which expressed early markers of differentiation (CD34, CD117), and more “mature” part, expressing monocytic antigens (CD11b, CD14, CD33). There was no clear separation between these parts of population. Despite the immunophenotypic similarity between monocytic part of leukemic population and normal monocytes, in 87.5% of studied cases there were same lymphoid coexpressions on these cells as on leukemic myeloblasts. Moreover, we showed that levels of CBFb-MYH11 expression in leukemic monocytes and myeloblasts were comparable. Presence of these characteristics in monocytes allows to consider them as part of leukemic cells population and take into consideration during the total immunophenotype reporting. </p></abstract><trans-abstract xml:lang="ru"><p>Целью данной работы было изучение иммунофенотипа клеток острого миелоидного лейкоза (ОМЛ) с inv(16)(p13.1q22)/CBFb-MYH11 и t(16;16)(p13.1;q22)/CBFb-MYH11 у детей. Данное исследование одобрено независимым этическим комитетом и утверждено решением ученого совета ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России. Проанализированы образцы костного мозга 36 детей с впервые выявленным ОМЛ с inv(16)(p13.1q22)/t(16;16)(p13.1;q22)/CBFb-MYH11. Была выявлена крайняя гетерогенность иммунофенотипа опухолевых клеток: экспрессировались как антигены ранних стадий дифференцировки (CD34, CD117, CD123), так и маркеры зрелых моноцитов (CD11c, CD14, CD64) и нейтрофилов (CD65, CD15). При этом в 55,6% случаев была отмечена коэкспрессия маркеров других линий дифференцировки, наиболее частым из которых был лимфоидный антиген CD2. В 83,3% исследуемых образцов отмечалось разделение популяции на 2 части: более «незрелую» – миелобластную, экспрессирующую ранние маркеры дифференцировки (CD34, CD117), и более «дифференцированную» – несущую на своей поверхности маркеры зрелых моноцитов (CD11b, CD14, CD33). При этом четкой границы между данными частями провести невозможно. Несмотря на то, что моноцитарная часть опухолевой популяции иммунофенотипически схожа с нормальными моноцитами, в 87,5% случаев ОМЛ с CBFb-MYH11 отмечалось наличие коэкспрессии тех же маркеров лимфоидной дифференцировки, что и на опухолевых миелобластах. Кроме того, было показано, что в лейкемических моноцитах детектируется химерный транскрипт CBFb-MYH11 на уровне, сопоставимом с таковым в лейкемических бластах. Наличие данных особенностей у моноцитов позволяет считать их частью опухолевой популяции и учитывать их иммунофенотип при описании суммарного иммунофенотипа опухоли при ОМЛ. </p></trans-abstract><kwd-group xml:lang="en"><kwd>acute myeloid leukemia</kwd><kwd>children</kwd><kwd>CBFb-MYH11 gene</kwd><kwd>immunophenotyping</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>острый миелоидный лейкоз</kwd><kwd>дети</kwd><kwd>ген CBFb-MYH11</kwd><kwd>иммунофенотипирование</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Norris D., Stone J. WHO classification of tumours of haematopoietic and lymphoid tissues. Geneva: WHO; 2008; 22–23.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Arber D.A., Orazi A., Hasserjian R., Thiele J., Borowitz M.J., Le Beau M.M. et al. The 2016 revision to the World Health Organization classification of myeloid neoplasms and acute leukemia. 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