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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">cancersp</journal-id><journal-title-group><journal-title xml:lang="ru">Южно-Российский онкологический журнал/ South Russian Journal of Cancer</journal-title><trans-title-group xml:lang="en"><trans-title>South Russian Journal of Cancer</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2686-9039</issn><publisher><publisher-name>АНО "Перспективы онкологии"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.37748/2686-9039-2024-5-3-2</article-id><article-id custom-type="edn" pub-id-type="custom">EYIRUH</article-id><article-id custom-type="elpub" pub-id-type="custom">cancersp-276</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>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Опыт создания первичных культур рака эндометрия и исследования в них клеток, обладающих фенотипом опухолевых стволовых клеток</article-title><trans-title-group xml:lang="en"><trans-title>Experience in creating primary cultures of endometrial cancer and studying cells carrying phenotype of cancer stem cells</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4558-5896</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Филиппова</surname><given-names>С. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Filippova</surname><given-names>S. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Филиппова Светлана Юрьевна – научный сотрудник лаборатории клеточных технологий, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-4558-5896" ext-link-type="uri">https://orcid.org/0000-0002-4558-5896</ext-link>, SPIN: 9586-2785, AuthorID: 878784, ResearcherID: AAH-4408-2020, Scopus Author ID: 57189618843</p></bio><bio xml:lang="en"><p>Svetlana Yu. Filippova – research fellow at the Laboratory of Cellular Technologies, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-4558-5896" ext-link-type="uri">https://orcid.org/0000-0002-4558-5896</ext-link>, SPIN: 9586-2785, AuthorID: 878784, ResearcherID: AAH-4408-2020, Scopus Author ID: 57189618843</p></bio><email xlink:type="simple">filsv@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7902-7278</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Межевова</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Mezhevova</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Межевова Ирина Валентиновна – младший научный сотрудник лаборатории клеточных технологий, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-7902-7278" ext-link-type="uri">https://orcid.org/0000-0002-7902-7278</ext-link>, SPIN: 3367-1741, AuthorID: 1011695, ResearcherID: AAI-1860-2019, Scopus Author ID: 57296602900</p></bio><bio xml:lang="en"><p>Irina V. Mezhevova – junior research fellow at the Laboratory of Cellular Technologies, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-7902-7278" ext-link-type="uri">https://orcid.org/0000-0002-7902-7278</ext-link>, SPIN: 3367-1741, AuthorID: 1011695, ResearcherID: AAI-1860-2019</p></bio><email xlink:type="simple">mezhevova88@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4555-8556</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чембарова</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Chembarova</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чембарова Татьяна Владимировна – младший научный сотрудник лаборатории клеточных технологий, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-4555-8556" ext-link-type="uri">https://orcid.org/0000-0002-4555-8556</ext-link>, SPIN: 5426-1873, AuthorID: 1051985, ResearcherID: AAR-3198-2021, Scopus Author ID: 57221303597</p></bio><bio xml:lang="en"><p>Tatiana V. Chembarova – junior research fellow at the Laboratory of Cellular Technologies, National Medical Research Centre for Oncology, Rostov- on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-4555-8556" ext-link-type="uri">https://orcid.org/0000-0002-4555-8556</ext-link>, SPIN: 5426-1873, AuthorID: 1051985, ResearcherID: AAR-3198-2021, Scopus Author ID: 57221303597</p></bio><email xlink:type="simple">tanyshamova@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6496-9641</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Новикова</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Novikova</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Новикова Инна Арнольдовна – д.м.н., заместитель генерального директора по науке, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-6496-9641" ext-link-type="uri">https://orcid.org/0000-0002-6496-9641</ext-link>, SPIN: 4810-2424, AuthorID: 726229, ResearcherID: E-7710-2018, Scopus Author ID: 57202252773</p></bio><bio xml:lang="en"><p>Inna A. Novikova – Dr. Sci. (Med.), Deputy General Director for Science, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-6496-9641" ext-link-type="uri">https://orcid.org/0000-0002-6496-9641</ext-link>, SPIN: 4810-2424, AuthorID: 726229, ResearcherID: E-7710-2018, Scopus Author ID: 57202252773</p></bio><email xlink:type="simple">novikovainna@yahoo.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1084-5176</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вереникина</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Verenikina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вереникина Екатерина Владимировна – д.м.н., заведующая отделением онкогинекологии, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-1084-5176" ext-link-type="uri">https://orcid.org/0000-0002-1084-5176</ext-link>, SPIN: 6610-7824, AuthorID: 734269, Scopus Author ID: 57194271506</p></bio><bio xml:lang="en"><p>Ekaterina V. Verenikina – Dr. Sci. (Med.), Head of the Department of Oncological Gynecology, National Medical Research Centre for Oncology, Rostov- on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-1084-5176" ext-link-type="uri">https://orcid.org/0000-0002-1084-5176</ext-link>, SPIN: 6610-7824, AuthorID: 734269, Scopus Author ID: 57194271506</p></bio><email xlink:type="simple">ekat.veren@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9833-8530</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Женило</surname><given-names>О. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhenilo</surname><given-names>O. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Женило Оксана Евгеньевна – к.м.н., врач-онколог отделения онкогинекологии, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-9833-8530" ext-link-type="uri">https://orcid.org/0000-0002-9833-8530</ext-link>, SPIN: 4078-7080, AuthorID: 732220</p></bio><bio xml:lang="en"><p>Oksana E. Zhenilo – Cand. Sci. (Med.), MD, physician oncologist at the Department of Oncological Gynecology, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-9833-8530" ext-link-type="uri">https://orcid.org/0000-0002-9833-8530</ext-link>, SPIN: 4078-7080, AuthorID: 732220</p></bio><email xlink:type="simple">zhenilo_mihail@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-8863-6229</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Половодова</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Polovodova</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Половодова Вероника Васильевна – аспирант, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0009-0004-8863-6229" ext-link-type="uri">https://orcid.org/0009-0004-8863-6229</ext-link>, SPIN: 3051-4734, AuthorID: 1214151</p></bio><bio xml:lang="en"><p>Veronika V. Polovodova – PhD student, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0009-0004-8863-6229" ext-link-type="uri">https://orcid.org/0009-0004-8863-6229</ext-link>, SPIN: 3051-4734, AuthorID: 1214151</p></bio><email xlink:type="simple">polovodovanika@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6881-2281</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шапошников</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shaposhnikov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шапошников Александр Васильевич – д.м.н., профессор, главный научный сотрудник торакоабдоминального отдела, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-6881-2281" ext-link-type="uri">https://orcid.org/0000-0001-6881-2281</ext-link>, SPIN: 8756-9438, AuthorID: 712823</p></bio><bio xml:lang="en"><p>Alexander V. Shaposhnikov – Dr. Sci. (Med.), MD, professor, chief researcher at the Thoracoabdominal Department, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-6881-2281" ext-link-type="uri">https://orcid.org/0000-0001-6881-2281</ext-link>, SPIN: 8756-9438, AuthorID: 712823</p></bio><email xlink:type="simple">onko-sekretar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7742-4918</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шалашная</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shalashnaya</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шалашная Елена Владимировна – к.б.н., старший научный сотрудник лаборатории изучения патогенеза злокачественных опухолей, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-7742-4918" ext-link-type="uri">https://orcid.org/0000-0001-7742-4918</ext-link>, SPIN: 2752-0907, AuthorID: 476968, ResearcherID: AAE-4085-2022, Scopus Author ID: 55144159900</p></bio><bio xml:lang="en"><p>Elena V. Shalashnaya – Cand. Sci. (Biol.), senior researcher at the Laboratory for the Study of the Malignant Tumors Pathogenesis, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-7742-4918" ext-link-type="uri">https://orcid.org/0000-0001-7742-4918</ext-link>, SPIN: 2752-0907, AuthorID: 476958, ResearcherID: AAE-4085-2022, Scopus Author ID: 55144159900</p></bio><email xlink:type="simple">onko-sekretar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7328-8074</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Маслов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Maslov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Маслов Андрей Александрович – д.м.н., профессор, главный врач, заслуженный врач Российской Федерации, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-7328-8074" ext-link-type="uri">https://orcid.org/0000-0001-7328-8074</ext-link>, SPIN: 5963-5915, AuthorID: 817983</p></bio><bio xml:lang="en"><p>Andrey A. Maslov – Dr. Sci. (Med.), MD, professor, chief physician, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0001-7328-8074" ext-link-type="uri">https://orcid.org/0000-0001-7328-8074</ext-link>, SPIN: 5963-5915, AuthorID: 817983</p></bio><email xlink:type="simple">onko-sekretar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5300-1213</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ишонина</surname><given-names>О. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Ishonina</surname><given-names>O. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ишонина Оксана Георгиевна – к.б.н., заведующий отделом подготовки и переподготовки специалистов, ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации, г. Ростов-на-Дону, Российская Федерация</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-5300-1213" ext-link-type="uri">https://orcid.org/0000-0002-5300-1213</ext-link>, SPIN: 4051-5165, AuthorID: 612417, Scopus Author ID: 37115461900</p></bio><bio xml:lang="en"><p>Oksana G. Ishonina – Cand. Sci. (Biol.), Head of the Department of Training and Retraining of Specialists, National Medical Research Centre for Oncology, Rostov-on-Don, Russian Federation</p><p>ORCID: <ext-link xlink:href="https://orcid.org/0000-0002-5300-1213" ext-link-type="uri">https://orcid.org/0000-0002-5300-1213</ext-link>, SPIN: 4051-5165, AuthorID: 612417, Scopus Author ID: 37115461900</p></bio><email xlink:type="simple">onko-sekretar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Centre for Oncology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2024</year></pub-date><volume>5</volume><issue>3</issue><fpage>16</fpage><lpage>30</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Филиппова С.Ю., Межевова И.В., Чембарова Т.В., Новикова И.А., Вереникина Е.В., Женило О.Е., Половодова В.В., Шапошников А.В., Шалашная Е.В., Маслов А.А., Ишонина О.Г., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Филиппова С.Ю., Межевова И.В., Чембарова Т.В., Новикова И.А., Вереникина Е.В., Женило О.Е., Половодова В.В., Шапошников А.В., Шалашная Е.В., Маслов А.А., Ишонина О.Г.</copyright-holder><copyright-holder xml:lang="en">Filippova S.Y., Mezhevova I.V., Chembarova T.V., Novikova I.A., Verenikina E.V., Zhenilo O.E., Polovodova V.V., Shaposhnikov A.V., Shalashnaya E.V., Maslov A.A., Ishonina O.G.</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.cancersp.com/jour/article/view/276">https://www.cancersp.com/jour/article/view/276</self-uri><abstract><sec><title>Цель исследования</title><p>Цель исследования. Изучить возможность применения метода сфероидообразования в культуре для оценки содержания опухолевых стволовых клеток (ОСК) рака эндометрия (РЭ) в сложных образцах, содержащих различные клетки опухоли и микроокружения.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Первичные культуры получали из фрагментов опухолей, удаленных в ходе оперативного вмешательства, проводимого в качестве первого этапа по лечению РЭ в отделении онкогинекологии ФГБУ «Национальный медицинский исследовательский центр онкологии» Министерства здравоохранения Российской Федерации. После ферментативной дезагрегации ткани клеточную суспензию пассировали в среде DMEM, содержащей 10 % фетальной бычьей сыворотки (ФБС) и 1 % гентамицина, для получения первичных двумерных культур. Для изучения способности клеток к сфероидообразованию первичную культуру снимали с культурального пластика и пассировали по 2,0 × 104 клеток на лунку 6-тилуночного планшета (n = 6) в среду DMEM, содержащую 0,35 % агарозы и факторы роста EGF (20 нг/мл) и FGF (20 нг/мл). Через две недели культивирования определяли средний размер, количество образующихся сфероидов и частоту сфероидообразования. Для тех культур, которые образовали сфероиды, было проведено иммунофлуоресцентное окрашивание двумерной культуры на маркер CD133, после чего определяли частоту CD133+ клеток.</p></sec><sec><title>Результаты</title><p>Результаты. Всего было получено девять первичных культур РЭ, из которых только пять образовали сфероиды спустя две недели культивирования в условиях, не поддерживающих адгезию. В этих культурах наибольшую связь со сфероидообразованием показали небольшие полигональные CD133+ клетки, с которыми ассоциировались наиболее крупные сфероиды (98–110 мкм в диаметре).</p></sec><sec><title>Заключение</title><p>Заключение. В смешанных культурах РЭ присутствует большое количество клеток микроокружения, из которого часть клеток может экспрессировать CD133, в том числе нормальные стволовые клетки, также образующие сфероиды в мягком агаре. Требуется более подробное изучение клеточных субпопуляций РЭ в сравнении с нормальным эндометрием для установления связи между наблюдаемым разнообразием клеток в культуре и их способностью к сфероидообразованию и другими характеристиками ОСК.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose of the study</title><p>Purpose of the study. Was to investigate the possibility of applying the method of spheroid formation in culture for assessment of the endometrial cancer (EC) tumor stem cells (TSC) content in complex samples containing various tumor cells and microenvironment.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Primary cultures were obtained from fragments of tumors removed during surgery as a first stage of treatment at the Department of Gynecological Oncology, the National Medical Research Center for Oncology. After enzymatic disaggregation of tissue, cell suspension was passaged in DMEM medium containing 10 % fetal bovine serum and 1 % gentamicin to obtain primary two-dimensional cultures. To study the ability of cells to form spheroids, the primary culture was removed from the culture plate and passaged with 2.0 × 104 cells per well of a six-well plate (n = 6) in DMEM medium containing 0.35 % agarose and growth factors EGF (20 ng/ml) and FGF (20 ng/ml). After two weeks of cultivation, the average size, number of formed spheroids, and frequency of spheroid formation were determined. For those cultures that had formed spheroids, immunofluorescent staining of the two-dimensional culture for the marker CD133 was performed, after which the frequency of CD133+ cells was determined.</p></sec><sec><title>Results</title><p>Results. A total of nine primary cultures of EC were obtained, five of which formed spheroids within two weeks of cultivation under non-adhesive conditions. In these cultures, small polygonal CD133+ cells showed the strongest association with spheroid formation, which were associated with the largest spheroids (98–110 μm in diameter).</p></sec><sec><title>Conclusion</title><p>Conclusion. There is a large number of microenvironmental cells in mixed cultures of CSC, some of which may express CD133, including healthy stem cells that also form spheroids in soft agar. A more detailed study of CSC subpopulations compared to normal endometrium is required to establish a link between the observed diversity of cells in culture and their ability to form spheroids and other characteristics of tumor stem cells.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>рак эндометрия</kwd><kwd>первичные культуры</kwd><kwd>опухолевые стволовые клетки</kwd><kwd>клеточные сфероиды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>endometrial cancer</kwd><kwd>primary cell cultures</kwd><kwd>cancer stem cells</kwd><kwd>cell spheroids</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Sung H, Ferlay J, Siegel RL, Laversanne M, Soerjomataram I, Jemal A, et al. Global Cancer Statistics 2020: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 Countries. 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