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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">Bone and soft tissue sarcomas, tumors of the skin</journal-id><journal-title-group><journal-title xml:lang="en">Bone and soft tissue sarcomas, tumors of the skin</journal-title><trans-title-group xml:lang="ru"><trans-title>Саркомы костей, мягких тканей и опухоли кожи</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2219-4614</issn><issn publication-format="electronic">2782-3687</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">767</article-id><article-id pub-id-type="doi">10.17650/2219-4614-2025-17-3-83-91</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>REAL CLINICAL CASES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЕ СЛУЧАИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Hereditary multiple exostosis in a practice of pediatric oncologist</article-title><trans-title-group xml:lang="ru"><trans-title>Множественная экзостозная болезнь в практике врача-онколога</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2197-8863</contrib-id><name-alternatives><name xml:lang="en"><surname>Zelenova</surname><given-names>E. E. </given-names></name><name xml:lang="ru"><surname>Зеленова</surname><given-names>Е. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p><bold>Ekaterina Evgenievna Zelenova</bold></p><p>24  Kashirskoe  Shosse,  Moscow  115522</p><p>32  Vavilova St.,  Moscow  119991</p></bio><bio xml:lang="ru"><p><bold>Екатерина Евгеньевна Зеленова</bold></p><p>115522  Москва,  Каширское шоссе,  24</p><p>119991  Москва,  ул. Вавилова,  32</p></bio><email>zelenovayeye@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dokuchaeva</surname><given-names>Ya. Yu.</given-names></name><name xml:lang="ru"><surname>Докучаева</surname><given-names>Я. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8149-254X</contrib-id><name-alternatives><name xml:lang="en"><surname>Khestanov</surname><given-names>D. B. </given-names></name><name xml:lang="ru"><surname>Хестанов</surname><given-names>Д. Б.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3225-1109</contrib-id><name-alternatives><name xml:lang="en"><surname>Kerimov</surname><given-names>P. A. </given-names></name><name xml:lang="ru"><surname>Керимов</surname><given-names>П. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2310-0106</contrib-id><name-alternatives><name xml:lang="en"><surname>Romantsova</surname><given-names>O. M. </given-names></name><name xml:lang="ru"><surname>Романцова</surname><given-names>О. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5836-0338</contrib-id><name-alternatives><name xml:lang="en"><surname> Sharapova</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Шарапова</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9705-1001</contrib-id><name-alternatives><name xml:lang="en"><surname>Semenova</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Семенова</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p><p>32  Vavilova St.,  Moscow  119991</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p><p>119991  Москва,  ул. Вавилова,  32</p></bio><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/0000-0001-5911-553X</contrib-id><name-alternatives><name xml:lang="en"><surname>Belysheva</surname><given-names>T. S.</given-names></name><name xml:lang="ru"><surname>Белышева</surname><given-names>Т. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>24  Kashirskoe  Shosse,  Moscow  115522</p></bio><bio xml:lang="ru"><p>115522  Москва,  Каширское шоссе,  24</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2642-4202</contrib-id><name-alternatives><name xml:lang="en"><surname>Nasedkina</surname><given-names>T. V.</given-names></name><name xml:lang="ru"><surname>Наседкина</surname><given-names>Т. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>32  Vavilova St.,  Moscow  119991</p></bio><bio xml:lang="ru"><p>119991  Москва,  ул. Вавилова,  32</p></bio><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">N.N.  Blokhin  National  Medical  Research  Center  of  Oncology,  Ministry  of  Health  of  Russia</institution></aff><aff><institution xml:lang="ru">ФГБУ  «Национальный  медицинский  исследовательский  центр  онкологии  им.  Н.Н.  Блохина»  Минздрава  России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Engelhardt  Institute  of  Molecular  Biology,  Russian  Academy  of  Sciences</institution></aff><aff><institution xml:lang="ru">ФГБУН  «Институт  молекулярной  биологии  им.  В.А.  Энгельгардта  Российской  академии  наук»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-10-14" publication-format="electronic"><day>14</day><month>10</month><year>2025</year></pub-date><volume>17</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>83</fpage><lpage>91</lpage><history><date date-type="received" iso-8601-date="2025-10-14"><day>14</day><month>10</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-10-14"><day>14</day><month>10</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Zelenova E.E., Dokuchaeva Y.Y., Khestanov D.B., Kerimov P.A., Romantsova O.M.,  Sharapova E.V., Semenova V.V., Belysheva T.S., Nasedkina T.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Зеленова Е.Е., Докучаева Я.Ю., Хестанов Д.Б., Керимов П.А., Романцова О.М., Шарапова Е.В., Семенова В.В., Белышева Т.С., Наседкина Т.В.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Zelenova E.E., Dokuchaeva Y.Y., Khestanov D.B., Kerimov P.A., Romantsova O.M.,  Sharapova E.V., Semenova V.V., Belysheva T.S., Nasedkina T.V.</copyright-holder><copyright-holder xml:lang="ru">Зеленова Е.Е., Докучаева Я.Ю., Хестанов Д.Б., Керимов П.А., Романцова О.М., Шарапова Е.В., Семенова В.В., Белышева Т.С., Наседкина Т.В.</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://sarbon.abvpress.ru/jour/article/view/767">https://sarbon.abvpress.ru/jour/article/view/767</self-uri><abstract xml:lang="en"><p>Multiple exostosis disease is a rare genetic disorder manifesting in skeletal lesions with development of multiple progressing deformations of the bones and joints. This pathology is characterized by high risk of malignant tumors accompanying bony outgrowths, primarily, chondrosarcoma with onset at the age of 20–40 years. Development  of multiple exostosis disease is mediated by pathogenic variants in the <italic>EXT1, EXT2</italic> and <italic>EXT3</italic> genes which are inherited through autosomal dominant type of inheritance with high penetrance. During diagnosis in children, this pathology should be differentiated from progressing ossifying fibrodysplasia, metachondromatosis, Langer–Giedion syndrome and common malignant tumors of the bones, cartilage and soft tissues.</p><p> The article presents 2 clinical observations of treatment of multiple exostosis disease. In the first case, familial form of the disease with transmission of pathogenic variant in the <italic>EXT1</italic> gene from the father and development of chondrosarcoma in both sons  at the ages of 17 and 21 years is described. In the second case, previously not described pathogenic variant in the <italic>EXT1</italic> gene identified de novo in a 12-year-old patient with Ewing sarcoma is presented. These observations demonstrate  the necessity of early oncological screening in patients with multiple exostosis disease.</p></abstract><trans-abstract xml:lang="ru"><p>Множественная экзостозная болезнь – редкое генетически детерминированное заболевание, проявляющееся  генерализованным поражением скелета с развитием многочисленных прогрессирующих деформаций костей и суставов. При данной патологии отмечается высокий риск развития злокачественных новообразований на фоне костных выростов, прежде всего хондросаркомы, дебют которой приходится на 20–40 лет. Возникновению множественной экзостозной болезни способствуют патогенные варианты генов <italic>EXT1, EXT2</italic> и <italic>EXT3</italic>, передающиеся по аутосомно- доминантному типу наследования с высокой пенетрантностью. При диагностике заболевания в детском возрасте данную патологию следует дифференцировать с прогрессирующией оссифицирующей фибродисплазией, метахондроматозом, синдромом Лангера–Гидиона, а также с распространенными злокачественными опухолями костных, хрящевых или мягких тканей.</p><p>В статье представлены 2 клинических наблюдения лечения множественной экзостозной болезни. В первом случае описана семейная форма заболевания с передачей патогенного варианта в гене <italic>EXT1</italic> по отцовской линии и развитием хондросаркомы в 17 лет и 21 год у обоих сыновей. Во втором случае представлен ранее не описанный  патогенный вариант в гене <italic>EXT1</italic>, выявленный de novo у пациента с саркомой Юинга в возрасте 12 лет. Приведенные наблюдения демонстрируют необходимость раннего проведения онкоскрининга у пациентов с множественной экзостозной болезнью.</p></trans-abstract><kwd-group xml:lang="en"><kwd>multiple exostosis disease</kwd><kwd><italic>EXT1</italic></kwd><kwd>chondrosarcoma</kwd><kwd>Ewing sarcoma</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>множественная экзостозная болезнь</kwd><kwd><italic>EXT1</italic></kwd><kwd>хондросаркома</kwd><kwd>саркома Юинга</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Pacifici M. Hereditary multiple exostoses: new insights into pathogenesis, clinical complications, and potential treatments. Curr Osteoporos Rep 2017;15(3):142–52. DOI: 10.1007/s11914-017-0355-2</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Francannet C., Cohen-Tanugi A., Le Merrer M. et al. Genotypephenotype correlation in hereditary multiple exostoses. J Med Genet 2001;38(7):430–4. 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