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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="research-article" 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">1098</article-id><article-id pub-id-type="doi">10.24287/j.1098</article-id><article-id pub-id-type="edn">SEDDPE</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Neurofibromatosis type 1 in a patient with a unique c.1369_1370insGGGTC mutation in the <italic>NF1</italic> gene</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности нейрофиброматоза 1-го типа у пациента с уникальной мутацией c.1369_1370insGGGTC в гене <italic>NF1</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4091-382X</contrib-id><name-alternatives><name xml:lang="en"><surname>Mustafin</surname><given-names>Rustam N.</given-names></name><name xml:lang="ru"><surname>Мустафин</surname><given-names>Рустам Наилевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Biol.), Associate Professor at the Department of Medical Genetics and Fundamental Medicine </p></bio><bio xml:lang="ru"><p>канд. биол. наук, доцент кафедры медицинской генетики и фундаментальной медицины </p></bio><email>ruji79@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Bashkir State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Башкирский государственный медицинский университет»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2026-08-19" publication-format="electronic"><day>19</day><month>08</month><year>2026</year></pub-date><volume>25</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>196</fpage><lpage>199</lpage><history><date date-type="received" iso-8601-date="2026-02-27"><day>27</day><month>02</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-05-20"><day>20</day><month>05</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, «D. Rogachev NMRCPHOI»</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, ФГБУ «НМИЦ ДГОИ им. Дмитрия Рогачева» Минздрава России</copyright-statement><copyright-year>2026</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/1098">https://hemoncim.com/jour/article/view/1098</self-uri><abstract xml:lang="en"><p>Neurofibromatosis type 1 (NF1) is a severe monogenic disorder characterized by café-au-lait spots and neoplastic lesions, including plexiform neurofibromas that are treated with targeted therapy using a mitogen-activated protein kinase inhibitor. A sporadic case of NF1 caused by a unique, previously unreported <italic>NF1</italic> gene mutation, c.1369_1370insGGGTC(p.H457fs), was identified in a 13-year-old boy. The features of NF1 in the patient included early manifestation of tumor syndrome with simultaneous development of cutaneous neurofibromas, tumors of spinal roots, vagus nerve and plexiform neurofibromas, cognitive and speech impairment, growth retardation, and multiple skeletal abnormalities. At the age of 10, targeted therapy was initiated, resulting in a significant tumor size reduction and thus indicating the effectiveness of this approach in NF1 caused by this pathogenic <italic>NF1</italic> variant.</p></abstract><trans-abstract xml:lang="ru"><p>Нейрофиброматоз 1-го типа (НФ1) – тяжелое моногенное заболевание, проявляющееся пигментными пятнами и опухолевыми поражениями, в том числе плексиформными нейрофибромами, для лечения которых используется таргетная терапия ингибитором митоген-активируемой протеинкиназы. Описан спорадический случай НФ1, обусловленный уникальной, ранее не описанной в мировой литературе, мутацией <italic>NF</italic><italic>1</italic> c.1369_1370insGGGTC(p.H457fs) у мальчика 13 лет. Особенностями НФ1 у пациента являются ранняя манифестация опухолевого синдрома с одновременным развитием кожных нейрофибром, опухолей спинномозговых корешков, блуждающего нерва и плексиформных нейрофибром, когнитивные нарушения, нарушение речи, задержка роста, множественные скелетные аномалии. С 10 лет начата таргетная терапия, на фоне которой размеры опухоли значительно уменьшились, что говорит об эффективности метода при НФ1, обусловленном данным уникальным патогенным вариантом в гене <italic>NF</italic><italic>1</italic>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>NF1 gene</kwd><kwd>neurofibromatosis type 1</kwd><kwd>skeletal abnormalities</kwd><kwd>plexiform neurofibroma</kwd><kwd>targeted therapy</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ген NF1</kwd><kwd>нейрофиброматоз 1-го типа</kwd><kwd>скелетные аномалии</kwd><kwd>плексиформная нейрофиброма</kwd><kwd>таргетная терапия</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Legius E., Messiaen L., Wolkenstein P., Pancza P., Avery R.A., Berman Y. et al. Revised diagnostic criteria for neurofibromatosis type 1 and Legius syndrome: an international consensus recommendation. Genet Med 2021;23(8):1506–13. 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