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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">Oncohematology</journal-id><journal-title-group><journal-title xml:lang="en">Oncohematology</journal-title><trans-title-group xml:lang="ru"><trans-title>Онкогематология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1818-8346</issn><issn publication-format="electronic">2413-4023</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">539</article-id><article-id pub-id-type="doi">10.17650/1818-8346-2022-17-2-60-74</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>BASIC RESEARCH</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФУНДАМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ В ПРАКТИЧЕСКОЙ МЕДИЦИНЕ НА СОВРЕМЕННОМ ЭТАПЕ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Analysis of microsatellite aberrations and loss of heterozygosity in follicular lymphoma, diffuse large B-cell lymphoma, and high-grade B-cell lymphoma patients</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ вариантов нестабильности микросателлитных повторов и потери гетерозиготности у пациентов с фолликулярной лимфомой, диффузной B-клеточной крупноклеточной лимфомой и B-клеточной лимфомой высокой степени злокачественности</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8053-9724</contrib-id><name-alternatives><name xml:lang="en"><surname>Sychevskaya</surname><given-names>K. A.</given-names></name><name xml:lang="ru"><surname>Сычевская</surname><given-names>К. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><email>sychevskaya-ka@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9535-6688</contrib-id><name-alternatives><name xml:lang="en"><surname>Misyurina</surname><given-names>A. E.</given-names></name><name xml:lang="ru"><surname>Мисюрина</surname><given-names>А. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3914-8611</contrib-id><name-alternatives><name xml:lang="en"><surname>Nikulina</surname><given-names>E. E.</given-names></name><name xml:lang="ru"><surname>Никулина</surname><given-names>Е. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2957-1619</contrib-id><name-alternatives><name xml:lang="en"><surname>Risinskaya</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Рисинская</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Abdurashidova</surname><given-names>R. R.</given-names></name><name xml:lang="ru"><surname>Абдурашидова</surname><given-names>Р. Р.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sarakaeva</surname><given-names>Z. T.</given-names></name><name xml:lang="ru"><surname>Саракаева</surname><given-names>З. Т.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4263-8275</contrib-id><name-alternatives><name xml:lang="en"><surname>Magomedova</surname><given-names>A. U.</given-names></name><name xml:lang="ru"><surname>Магомедова</surname><given-names>А. У.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9463-9187</contrib-id><name-alternatives><name xml:lang="en"><surname>Sudarikov</surname><given-names>A. B.</given-names></name><name xml:lang="ru"><surname>Судариков</surname><given-names>А. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9086-8521</contrib-id><name-alternatives><name xml:lang="en"><surname>Kravchenko</surname><given-names>S. K.</given-names></name><name xml:lang="ru"><surname>Кравченко</surname><given-names>С. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><italic>125167, Moscow, Novyy Zykovskiy Proezd, 4</italic></p></bio><bio xml:lang="ru"><p><italic>125167 Москва, Новый Зыковский проезд, 4</italic></p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Center for Hematology, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">ФГБУ «Национальный медицинский исследовательский центр гематологии» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-04-14" publication-format="electronic"><day>14</day><month>04</month><year>2022</year></pub-date><volume>17</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>60</fpage><lpage>74</lpage><history><date date-type="received" iso-8601-date="2022-04-12"><day>12</day><month>04</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2022-04-12"><day>12</day><month>04</month><year>2022</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://oncohematology.abvpress.ru/ongm/article/view/539">https://oncohematology.abvpress.ru/ongm/article/view/539</self-uri><abstract xml:lang="en"><p><bold>Background</bold>. The study of genetic predictors of non-Hodgkin’s lymphomas prognosis is one of the most relevant areas of oncohematology. It is extremely interesting to search for integral markers that reflect the most important stages of tumor pathogenesis. DNA repair system plays one of the key roles in genomic instability. Aberrations of microsatellite repeats such as microsatellite instability (MSI), in particular elevated microsatellite alterations at selected tetranucleotide repeats (EMAST) is characteristic for mismatch repair system and loss of heterozygosity (LOH) is an integral feature of genomic instability.<bold>Objective</bold>. Analysis of MSI, EMAST, LOH significance in follicular lymphoma (FL), diffuse large B-cell lymphoma (DLBCL), and high-grade B-cell lymphoma (HGBL) patients.<bold>Materials and methods</bold>. The study was performed by multiplex PCR and fragment analysis with diagnostic panels COrDIS Plus and COrDIS MSI in 85 FL patients, 32 DLBCL patients, and 37 HGBL patients.<bold>Results</bold>. The frequency of LOH in the general FL group was 40/81 (49.4 %), MSI – 10/82 (12.2 %), EMAST – 15/81 (18.5 %). The frequency of LOH in the HGBL group was 21/31 (67.8 %), MSI – 11/37 (29.7 %), EMAST – 13/31 (41.9 %). The frequency of LOH in the DLBCL group was 18/29 (62.0 %), MSI – 5/32 (15.6 %), EMAST – 14/32 (43.8 %). When considering the morphological types of FL, it was noted that a higher frequency of genetic aberrations was characteristic of lymphomas with a more aggressive morphology (p &lt;0.05). LOH identifies FL and HGBL patients with an unfavorable prognosis. The EMAST analysis allows identifying additional patients in the LOH+ cohort with early events and low EFS.<bold>Conclusion</bold>. LOH and EMAST have a prognostic value for FL and HGBL. No associations of LOH and EMAST with the survival were observed in DLBCL. Changes in mononucleotide repeats in FL, DLBCL and HGBL did not correspond to the MSI-H characteristic of solid tumors. For this reason, the clinical consequences of MSI-H in solid neoplasms, in particular the efficacy of immune checkpoint inhibitors, in lymphomas cannot be expected to be replicated solely on the basis of microsatellite aberrations detection.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение</bold>. Изучение генетических предикторов течения неходжкинских лимфом является одним из актуальных направлений онкогематологии. Крайне интересным представляется поиск значимых маркеров, отражающих важнейшие этапы патогенеза опухоли. Одну из ключевых ролей в развитии нестабильности генома играют дефекты систем репарации. Нарушения микросателлитных повторов по типу микросателлитной нестабильности (microsatellite instability, MSI), в частности аберраций микросателлитных тетрануклеотидных повторов (elevated microsatellite alterations at selected tetranucleotide repeats, EMAST), характерны для дефицита системы репарации ошибочно спаренных нуклеотидов. Анализ микросателлитного профиля также позволяет детектировать потерю гетерозиготности (loss of heterozygosity, LOH). Феномен LOH является интегральным отражением нестабильности генома.<bold>Цель исследования</bold> – анализ значения MSI, в частности EMAST, и LOH при фолликулярной лимфоме (ФЛ), диффузной B-клеточной крупноклеточной лимфоме (ДВККЛ) и B-клеточной лимфоме высокой степени злокачественности (ВКЛВСЗ).<bold>Материалы и методы</bold>. Исследование было выполнено методом мультиплексной полимеразной цепной реакции и последующего фрагментного анализа с использованием диагностических панелей COrDIS Plus и COrDIS MSI у 85 пациентов с ФЛ, у 32 пациентов с ДВККЛ и у 37 пациентов с ВКЛВСЗ.<bold>Результаты</bold>. В общей группе ФЛ частота LOH составила 40/81 (49,4 %), MSI – 10/82 (12,2 %), EMAST – 15/81 (18,5 %). В группе ВКЛВСЗ частота LOH составила 21/31 (67,8 %), MSI – 11/37 (29,7 %), EMAST – 13/31 (41,9 %). В группе ДВККЛ частота LOH составила 18/29 (62,0 %), MSI – 5/32 (15,6 %), EMAST – 14/32 (43,8 %). При рассмотрении морфологических типов ФЛ было отмечено, что более высокая частота генетических аберраций была характерна для лимфом с морфологией, соответствующей более агрессивным формам (p &lt;0,05). Исследование LOH позволяет выделить группу пациентов с неблагоприятным прогнозом ФЛ и ВКЛВСЗ. Анализ EMAST позволяет дополнительно выявить в когорте LOH+ больных с низкой бессобытийной выживаемостью.<bold>Заключение</bold>. LOH и EMAST обладают прогностическим значением при ФЛ и ВКЛВСЗ. При ДВККЛ ассоциации LOH и EMAST с выживаемостью не отмечено. Изменения мононуклеотидных повторов при ФЛ, ДВККЛ и ВКЛВСЗ не соответствовали феномену MSI-H (высокий уровень MSI), характерному для синдрома Линча и подобных ему опухолей. По этой причине нельзя ожидать воспроизведения клинических следствий MSI-H в случае солидных новообразований, в частности эффективности ингибиторов иммунных контрольных точек, при лимфомах исключительно на основании выявления аберраций микросателлитов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>follicular lymphoma</kwd><kwd>diffuse large B-cell lymphoma</kwd><kwd>high-grade B-cell lymphoma</kwd><kwd>genetic instability</kwd><kwd>short tandem repeats</kwd><kwd>microsatellite instability</kwd><kwd>elevated microsatellite alterations at selected tetranucleotide repeats</kwd><kwd>loss of heterozygosity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фолликулярная лимфома</kwd><kwd>диффузная B-клеточная крупноклеточная лимфома</kwd><kwd>B-клеточная лимфома высокой степени злокачественности</kwd><kwd>нестабильность генома</kwd><kwd>короткие тандемные повторы</kwd><kwd>микросателлитная нестабильность</kwd><kwd>аберрации микросателлитных тетрануклеотидных повторов</kwd><kwd>потеря гетерозиготности</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Ionov Y., Peinado M.A., Malkhosyan S. et al. 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