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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">medgen</journal-id><journal-title-group><journal-title xml:lang="ru">Медицинская генетика</journal-title><trans-title-group xml:lang="en"><trans-title>Medical Genetics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-7998</issn><publisher><publisher-name>Publishing House «Genius Media» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.25557/2073-7998.2025.12.151-153</article-id><article-id custom-type="elpub" pub-id-type="custom">medgen-3368</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КРАТКИЕ СООБЩЕНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BRIEF REPORT</subject></subj-group></article-categories><title-group><article-title>BRCA-подобный фенотип в определении тактики лечения пациентов с опухолью молочной железы.</article-title><trans-title-group xml:lang="en"><trans-title>BRCA-like phenotype in determining the treatment tactics for patients with breast cancer.</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Цыганов</surname><given-names>М. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Tsyganov</surname><given-names>M. M.</given-names></name></name-alternatives><email xlink:type="simple">tsyganovmm@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ибрагимова</surname><given-names>М. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Ibragimova</surname><given-names>M. K.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Брагина</surname><given-names>О. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Bragina</surname><given-names>O. D.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Федоренко</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedorenko</surname><given-names>A. A.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Научно-исследовательский институт онкологии, Томский национальный исследовательский медицинский центр Российской академии наук&#13;
634009, г. Томск, пер. Кооперативный, д. 5</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Cancer Research Institute, Tomsk National Research Medical Center, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>31</day><month>01</month><year>2026</year></pub-date><volume>24</volume><issue>12</issue><fpage>151</fpage><lpage>153</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Цыганов М.М., Ибрагимова М.К., Брагина О.Д., Федоренко А.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Цыганов М.М., Ибрагимова М.К., Брагина О.Д., Федоренко А.А.</copyright-holder><copyright-holder xml:lang="en">Tsyganov M.M., Ibragimova M.K., Bragina O.D., Fedorenko A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.medgen-journal.ru/jour/article/view/3368">https://www.medgen-journal.ru/jour/article/view/3368</self-uri><abstract><p>Введение. В настоящее время открытым остаётся вопрос о химиоиндуцированной резистентности и восстановлении активности генов гомологичной рекомбинации при лечении больных с раком молочной железы (РМЖ). Цель: исследование связи дефицита гомологичной рекомбинации (ДГР) с эффективностью лечения и оценка компенсаторности BRCA-подобного фенотипа под действием химиопрепаратов. Методы. В исследование было включено 130 больных РМЖ. Для исследований in vitro были использованы клеточные линии РМЖ: MCF-7, MDA-MB-231, MDA-MB-468. Анализ параметров ДГР проводили с использованием микроматричного анализа, ОТ-ПЦР и NGS. Результаты. Гиперэкспрессия CHEK1, PARP1, BRCA1 связана с прогрессированием опухоли, равно как и появление амплификаций в генах BRCA1, BARD1, CHEK1 и др. (83% случаев). Работа на моделях in vitro позволила установить, что под действием химиопрепаратов происходит восстановление состояние системы гомологичной рекомбинации и это может являться одной из причин формирования резистентности опухолевых клеток. Выводы. Наличие ДГР в опухоли молочной железы является важным маркером в персонализированном подходе к лечению. Однако остается открытым вопрос в преодолении формирования резистентности опухоли за счет компенсаторности ДГР, что несомненно требует дальнейшего изучения.</p></abstract><trans-abstract xml:lang="en"><p>Introduction. Currently, the issue of chemo-induced resistance and restoration of homologous recombination gene activity in the treatment of patients with breast cancer (BC) remains open. Aim: to study the relationship between homologous recombination deficiency (HRD) and the effectiveness of treatment and to assess the compensability of the BRCA-like phenotype under the influence of chemotherapy drugs. Methods. The study included 130 patients with BC. For in vitro studies, the following breast cancer cell lines were used: MCF-7, MDA-MB-231, MDA-MB-468. The analysis of HRD parameters was performed using: microarray analysis, RT-PCR and NGS. Results. Hyperexpression of CHEK1, PARP1, BRCA1 is associated with tumor progression, as well as the appearance of amplifications in the BRCA1, BARD1, CHEK1 genes and others (83% of cases). Work on in vitro models made it possible to establish that under the influence of chemotherapy drugs, the state of the homologous recombination system is restored, and this may be one of the reasons for the formation of tumor cell resistance. Conclusions. The presence of HRD in a breast tumor is an important marker in a personalized approach to treatment. However, the question of overcoming the formation of tumor resistance due to HRD compensatory remains open, which undoubtedly requires further study.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>BRCA-подобный фенотип</kwd><kwd>дефицит гомологичной рекомбинации</kwd><kwd>in vitro</kwd><kwd>делеция</kwd><kwd>персонализированная химиотерапия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>BRCA-like phenotype</kwd><kwd>homologous recombination deficiency</kwd><kwd>in vitro</kwd><kwd>deletion</kwd><kwd>personalized chemotherapy</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа поддержана грантом РНФ № 22-15-00169-П.</funding-statement><funding-statement xml:lang="en">The work was supported by the Russian Science Foundation grant No. 22-15-00169-П.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Turner N.C., Reis-Filho J.S. 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