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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">Advances in Molecular Oncology</journal-id><journal-title-group><journal-title xml:lang="en">Advances in Molecular Oncology</journal-title><trans-title-group xml:lang="ru"><trans-title>Успехи молекулярной онкологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2313-805X</issn><issn publication-format="electronic">2413-3787</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">544</article-id><article-id pub-id-type="doi">10.17650/2313-805X-2023-10-2-90-99</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>EXPERIMENTAL REPORT</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ЭКСПЕРИМЕНТАЛЬНАЯ СТАТЬЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">The specifics of CpG islets methylation of some genes of peripheral blood T-lymphocytes in breast cancer patients before and after treatment</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности метилирования CpG-сайтов некоторых генов Т-лимфоцитов периферической крови пациентов с раком молочной железы до и после лечения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2524-8750</contrib-id><name-alternatives><name xml:lang="en"><surname>Goncharova</surname><given-names>T. G.</given-names></name><name xml:lang="ru"><surname>Гончарова</surname><given-names>Т. Г.</given-names></name></name-alternatives><address><country country="KZ">Kazakhstan</country></address><bio xml:lang="en"><p>Tatyana G. Goncharova.</p><p>91 Prospekt Abaya, Almaty A05A2B4</p></bio><bio xml:lang="ru"><p>Гончарова Татьяна Георгиевна.</p><p>A05A2B4 Алматы, проспект Абая, 91</p></bio><email>goncharova.2004@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0986-1328</contrib-id><name-alternatives><name xml:lang="en"><surname>Omarbayeva</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Омарбаева</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="KZ">Kazakhstan</country></address><bio xml:lang="en"><p>Nazgul A. Omarbaeva.</p><p>91 Prospekt Abaya, Almaty A05A2B4</p></bio><bio xml:lang="ru"><p>Омарбаева Назгуль Айдарбековна.</p><p>A05A2B4 Алматы, проспект Абая, 91</p></bio><email>nazgulek87@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0969-5983</contrib-id><name-alternatives><name xml:lang="en"><surname>Kaidarova</surname><given-names>D. R.</given-names></name><name xml:lang="ru"><surname>Кайдарова</surname><given-names>Д. Р.</given-names></name></name-alternatives><address><country country="KZ">Kazakhstan</country></address><bio xml:lang="en"><p>91 Prospekt Abaya, Almaty A05A2B4</p></bio><bio xml:lang="ru"><p>A05A2B4 Алматы, проспект Абая, 91</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8191-2068</contrib-id><name-alternatives><name xml:lang="en"><surname>Orazgaliyeva</surname><given-names>M. G.</given-names></name><name xml:lang="ru"><surname>Оразгалиева</surname><given-names>М. Г.</given-names></name></name-alternatives><address><country country="KZ">Kazakhstan</country></address><bio xml:lang="en"><p>91 Prospekt Abaya, Almaty A05A2B4</p></bio><bio xml:lang="ru"><p>A05A2B4 Алматы, проспект Абая, 91</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4599-4048</contrib-id><name-alternatives><name xml:lang="en"><surname>Malysheva</surname><given-names>L. A.</given-names></name><name xml:lang="ru"><surname>Малышева</surname><given-names>Л. А.</given-names></name></name-alternatives><address><country country="KZ">Kazakhstan</country></address><bio xml:lang="en"><p>91 Prospekt Abaya, Almaty A05A2B4</p></bio><bio xml:lang="ru"><p>A05A2B4 Алматы, проспект Абая, 91</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kazakh Institute of Oncology and Radiology</institution></aff><aff><institution xml:lang="ru">Казахский научно-исследовательский институт онкологии и радиологии</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-05-15" publication-format="electronic"><day>15</day><month>05</month><year>2023</year></pub-date><volume>10</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>90</fpage><lpage>99</lpage><history><date date-type="received" iso-8601-date="2023-02-11"><day>11</day><month>02</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-07-10"><day>10</day><month>07</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Goncharova T.G., Omarbayeva N.A., Kaidarova D.R., Orazgaliyeva M.G., Malysheva L.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Гончарова Т.Г., Омарбаева Н.А., Кайдарова Д.Р., Оразгалиева М.Г., Малышева Л.А.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Goncharova T.G., Omarbayeva N.A., Kaidarova D.R., Orazgaliyeva M.G., Malysheva L.A.</copyright-holder><copyright-holder xml:lang="ru">Гончарова Т.Г., Омарбаева Н.А., Кайдарова Д.Р., Оразгалиева М.Г., Малышева Л.А.</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://umo.abvpress.ru/jour/article/view/544">https://umo.abvpress.ru/jour/article/view/544</self-uri><abstract xml:lang="en"><p><bold>Introduction</bold>. The growth of primary breast tumor morbidity in the last ten years and increased number of patients with disseminated breast cancer in the Republic of Kazakhstan require the search for methods of early diagnosis of malignant tumors. Determination of breast cancer markers in epigenetic studies allows to use them as diagnostic signs of the presence of malignant tumor and as predictors of treatment effectiveness in patients with this pathology.</p><p><bold>Aim</bold>. To perform  a search for therapeutic and prognostic breast cancer markers.</p><p><bold>Materials and methods</bold>. The study included samples of biological material (peripheral blood) of 50 deemed healthy individuals and 103 patients with locally advanced and disseminated breast cancer receiving special therapy. The following methods were used: blood collection, DNA extraction, creation of DNA methylation profiles, sequencing, statistical data analysis.</p><p><bold>Results</bold>. The results of search for epigenetic mutations in peripheral blood of patients with breast cancer showed their role as specific diagnostic, therapeutic and prognostic markers with specificity 0.91 % and sensitivity 0.94 %. The hypothesis on therapeutic  significance of identified earlier diagnostic markers in patients  with breast cancer, namely hypermethylation of CpG islands associated with genes <italic>JAM3, C17orf64,  MSC, C7orf51</italic>  and CpG island associated with intragene part of chromosome 5 (chr5: 77,208,034–77,329,434) was tested and confirmed.</p><p><bold>Conclusion</bold>. A correlation between DNA methylation characteristics and disease progression during treatment was shown. The study results can be used in clinical practice: epigenetic markers, such as methylation in the CpG islets associated with the <italic>JAM3, C17orf64, MSC, C7orf51</italic> genes, and in the CpG islet associated with the intragenic site of chromosome 5 (chr5: 77,208,034–77,329,434) can be used as prognostic markers and therapeutic predictors of breast cancer.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение</bold>. Рост первичной заболеваемости раком молочной железы (РМЖ) за последнее десятилетие и увеличение числа пациентов с диссеминированным РМЖ в Республике Казахстан обусловливают необходимость поиска возможностей ранней диагностики злокачественных новообразований. Определение маркеров РМЖ в эпигенетических исследованиях позволяет использовать их в качестве диагностических показателей наличия злокачественной опухоли и предикторов эффективности лечения пациентов с данной патологией.</p><p><bold>Цель исследования</bold> – поиск эпигенетических терапевтических и прогностических маркеров РМЖ.</p><p><bold>Материалы и методы</bold>. в исследование вошли образцы биологического материала (периферическая кровь) 50 условно здоровых людей и 103 больных местно-распространенным и диссеминированным РМЖ, получавших специальную</p><p>терапию. методы проведения исследования: забор крови, выделение ДНК, создание профилей метилирования ДНК, секвенирование, статистическая обработка данных.</p><p><bold>Результаты</bold>. Результаты поиска эпигенетических мутаций в периферической крови больных РМЖ показали их роль как диагностических, терапевтических и прогностических маркеров со специфичностью 91 % и чувствительностью 94,0 %. проверена и подтверждена гипотеза о терапевтической значимости ранее обнаруженных диагностических маркеров для пациентов с РМЖ, а именно метилирования в островках CpG, связанных с генами  <italic>JAM3, C17orf64, MSC, C7orf51</italic>, и в островке CpG, связанном с внутригенным участком хромосомы 5 (chr5: 77,208,034–77,329,434).</p><p><bold>Заключение</bold>. Определена корреляционная связь между особенностями метилирования ДНК и течением болезни на фоне лечения. данные, полученные в ходе настоящего исследования, могут быть использованы в клинической практике: эпигенетические маркеры, такие как метилирование в островках CpG, связанных с генами  <italic>JAM3, C17orf64, MSC, C7orf51</italic>, и в островке CpG, связанном с внутригенным участком хромосомы 5 (chr5: 77,208,034–77,329,434), можно применять как прогностические маркеры и терапевтические предикторы при РМЖ.</p></trans-abstract><kwd-group xml:lang="en"><kwd>breast cancer</kwd><kwd>epigenetics</kwd><kwd>DNA methylation</kwd><kwd>biomarker</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рак молочной железы</kwd><kwd>эпигенетика</kwd><kwd>метилирование ДНК</kwd><kwd>биомаркер</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was performed with the financial support of the grant Ministry of Education and Science of Republic of Kazakhstan of AP05131940 “Possibilities to determine T-lymphocyte markers in early diagnostics and prognosis of lung and breast cancer”, and the work was carried out within the framework of the budget topic of Ministry of Health of Republic of Kazakhstan OR12165486 “National program for the implementation of personalized and preventive medicine in the Republic of Kazakhstan”. The authors express their gratitude to David Cheishvili, Farida Vaisheva and Moshe Szyf for their help in organizing and performing epigenetic studies.</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке гранта Министерства образования и науки Республики Казахстан АР05131940 «Возможности определения маркеров Т-лимфоцитов в ранней диагностике и прогнозировании рака легких и молочной железы», а также в рамках бюджетной темы Министерства здравоохранения Республики Казахстан OR12165486 «Национальная программа внедрения персонализированной и превентивной медицины в Республике Казахстан». 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