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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">529</article-id><article-id pub-id-type="doi">10.24287/1726-1708-2021-20-4-69-77</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">Long-term outcome and surrogate molecular signatures of pediatric patients with diffuse astrocytomas</article-title><trans-title-group xml:lang="ru"><trans-title>Прогностическое значение суррогатного молекулярного профиля диффузных астроцитом у детей</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7134-8923</contrib-id><name-alternatives><name xml:lang="en"><surname>Mikhaleuskaya</surname><given-names>T. M.</given-names></name><name xml:lang="ru"><surname>Михалевская</surname><given-names>Т. М.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>Head of the Laboratory of molecular studies,</p><p>43 Frunzenskaya St., Borovlyany 223053, Minsk region</p></bio><bio xml:lang="ru"><p>заведующая лабораторией молекулярногенетических исследований ГУ «Республиканский научнопрактический центр  детской онкологии, гематологии и иммунологии»,</p><p>223053, Минский район, д. Боровляны, ул. Фрунзенская, 43</p></bio><email>aisiat@tut.by</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2604-324X</contrib-id><name-alternatives><name xml:lang="en"><surname>Kapuza</surname><given-names>D. R.</given-names></name><name xml:lang="ru"><surname>Капуза</surname><given-names>Дарья Романовна</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>43 Frunzenskaya St., Borovlyany 223053, Minsk region</p></bio><bio xml:lang="ru"><p>223053, Минский район, д. Боровляны, ул. Фрунзенская, 43</p></bio><email>kolodich.darya@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0592-7182</contrib-id><name-alternatives><name xml:lang="en"><surname>Konoplya</surname><given-names>N. E.</given-names></name><name xml:lang="ru"><surname>Конопля</surname><given-names>наталья Евгеньевна</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p> Lesnoy, Minsk region</p></bio><bio xml:lang="ru"><p>Минский район, аг. Лесной</p></bio><email>nkonoplya@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3232-2322</contrib-id><name-alternatives><name xml:lang="en"><surname>Bydanov</surname><given-names>O. I.</given-names></name><name xml:lang="ru"><surname>Быданов</surname><given-names>Олег Иванович</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>43 Frunzenskaya St., Borovlyany 223053, Minsk region</p></bio><bio xml:lang="ru"><p>223053, Минский район, д. Боровляны, ул. Фрунзенская, 43</p></bio><email>budanov@oncology.by</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0143-1921</contrib-id><name-alternatives><name xml:lang="en"><surname>Aleinikova</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Алейникова</surname><given-names>Ольга Витальевна</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>43 Frunzenskaya St., Borovlyany 223053, Minsk region</p></bio><bio xml:lang="ru"><p>223053, Минский район, д. Боровляны, ул. Фрунзенская, 43</p></bio><email>aleinikova2004@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Belarusian Research Center for Pediatric Oncology, Hematology and Immunology</institution></aff><aff><institution xml:lang="ru">ГУ «Республиканский научно-практический центр детской онкологии, гематологии и иммунологии», Республика Беларусь</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">N.N. Alexandrov National Cancer Centre</institution></aff><aff><institution xml:lang="ru">ГУ «Республиканский научно-практический центр онкологии и медицинской радиологии им. Н.Н. Александрова»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2021-12-22" publication-format="electronic"><day>22</day><month>12</month><year>2021</year></pub-date><volume>20</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>69</fpage><lpage>77</lpage><history><date date-type="received" iso-8601-date="2021-07-26"><day>26</day><month>07</month><year>2021</year></date><date date-type="accepted" iso-8601-date="2021-10-18"><day>18</day><month>10</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/529">https://hemoncim.com/jour/article/view/529</self-uri><abstract xml:lang="en"><p>Diffuse astrocytomas is the major cause of mortality in pediatric neurooncology. Pediatric diffuse astrocytomas are clinically and biologically heterogeneous, they consist of distinct subtypes driven by various molecular events. Our aim was to reveal if the surrogate molecular signatures reflecting molecular alterations underlying diffuse astrocytomas could be of prognostic value. The surrogate molecular signature was determined by IHC with antibodies to IDH1R132H, p53, BRAF V600E, H3K27trimethylated, ATRX and by cytogenetics with identification of deletion CDKN2A and FGFR2 fusion. As a result, we obtained 6 groups of diffuse astrocytomas with different surrogate molecular signatures, which we designated as H3K27mut, ALT, IDH1mut, BRAFmut-PXA, BRAF mut/FGFR2, MYB. A total of 62 patients (29 male, 33 female, mean age 10,6 years, range 0–18 years) were analyzed. The study was approved by the Independent Ethics Committee and the Scientific Council of the Belarusian Research Center for Pediatric Oncology, Hematology and Immunology (Republic of Belarus). These surrogate molecular signatures were associated with significantly different outcomes, i.e. BRAFmut/FGFR2, MYB groups show a significantly good prognosis with 100% overall survival and relapse-free survival of 89 ± 11% and 100%. Groups H3K27mut, ALT, IDH1mut, BRAFmut-PXA display extremely poor outcomes with EFS equal to 0%, 20 ± 17%, 44 ± 17%, 18 ± 12% respectively, and OS equal to 23 ± 19%, 37 ± 20%, 40 ± 17%, 53 ± 19% respectively. The recognition of subtypes of pediatric diffuse astrocytomas based on surrogate molecular signature revealed close correlations with biological parameters and clinical outcomes and may therefore, be predictive of response to standard treatment protocols. </p></abstract><trans-abstract xml:lang="ru"><p>Диффузные астроцитомы являются основной причиной смертности в детской нейроонкологии. Педиатрические диффузные астроцитомы клинически и биологически неоднородны, они состоят из отдельных подтипов, обусловленных различными молекулярными нарушениями. Нашей целью было выяснить, могут ли суррогатные молекулярные подписи, отражающие молекулярные изменения в диффузных астроцитомах, иметь прогностическую ценность. Для определения суррогатной молекулярной подписи мы использовали иммуногистохимическое исследование с антителами к IDH1R132H, p53, BRAFV600E, H3K27 trimethylated, ATRX и цитогенетическое исследование с выявлением делеции CDKN2A и транслокации FGFR2. В результате мы получили 6 групп диффузных астроцитом с различными суррогатными молекулярными подписями, которые обозначили как H3K27mut, ALT, IDH1mut, BRAFmut-PXA, BRAFmut/FGFR2 и MYB. Всего были проанализированы 62 пациента (29 мальчиков и 33 девочки, возраст больных от 0 до 17 лет, cредний возраст – 10,6 года). Данное исследование одобрено независимым этическим комитетом и утверждено решением ученого совета ГУ «Республиканский научно-практический центр детской онкологии, гематологии и иммунологии» (Республика Беларусь). Выживаемость в группах диффузных астроцитом с разными суррогатными молекулярными подписями значительно отличалась: группы BRAFmut/FGFR2 и MYB имели благоприятный прогноз с общей выживаемостью 100% и безрецидивной выживаемостью 89 ± 11% и 100% соответственно. Группы H3K27mut, ALT, IDH1mut и BRAFmut-PXA характеризовались неблагоприятным течением с бессобытийной выживаемостью 0%, 20 ± 17%, 44 ± 17% и 18 ± 12% соответственно и общей выживаемостью 23 ± 19%, 37 ± 20%, 40 ± 17% и 53 ± 19% соответственно. Определение подтипов педиатрических диффузных астроцитом на основе суррогатной молекулярной подписи тесно коррелирует с биологическими параметрами и клиническими исходами и, следовательно, может быть предиктором ответа на стандартные протоколы лечения. </p></trans-abstract><kwd-group xml:lang="en"><kwd>brain</kwd><kwd>neurooncology</kwd><kwd>children</kwd><kwd>diffuse gliomas</kwd><kwd>prognosis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>головной мозг</kwd><kwd>нейроонкология</kwd><kwd>дети</kwd><kwd>диффузные глиомы</kwd><kwd>прогноз</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проведено в рамках государственной научно-технической программы «Разработать и внедрить комплексный метод прогнозирования биологического поведения нейроэпителиальных опухолей у детей, основанный на выявлении молекулярно-генетических маркеров».</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Faury D., Nantel A., Dunn S.E., Guiot M.-C., Haque T., Hauser P., et al. 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