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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">MD-Onco</journal-id><journal-title-group><journal-title xml:lang="en">MD-Onco</journal-title><trans-title-group xml:lang="ru"><trans-title>MD-Onco</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2782-3202</issn><issn publication-format="electronic">2782-6171</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">156</article-id><article-id pub-id-type="doi">10.17650/2782-3202-2024-4-4-41-46</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>NEW APPROACHES AND SUCCESSES IN TREATMENT OF ONCOLOGICAL PATIENTS AT THE CURRENT STAGE</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>НОВЫЕ НАПРАВЛЕНИЯ И УСПЕХИ В ЛЕЧЕНИИ ОНКОЛОГИЧЕСКИХ БОЛЬНЫХ НА СОВРЕМЕННОМ ЭТАПЕ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Neoadjuvant chemotherapy and pathological complete response in hormone-positive HER2-negative breast cancer: influence of progesterone receptor expression, tumor grade and Ki-67</article-title><trans-title-group xml:lang="ru"><trans-title>Неоадъювантная химиотерапия и полный патоморфологический ответ при гормон-положительном HER2-отрицательном раке молочной железы: влияние экспрессии рецепторов прогестерона, гистологической степени злокачественности и уровня Ki-67</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2050-142X</contrib-id><name-alternatives><name xml:lang="en"><surname>Zanozina</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Занозина</surname><given-names>E. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Ekaterina Alekseevna Zanozina</p><p>3 2nd Botkinskiy Proezd, Moscow, 125284</p></bio><bio xml:lang="ru"><p>Екатерина Алексеевна Занозина</p><p>125284, Москва, 2-й Боткинский пр-д, 3</p></bio><email>zanozinaekaterina@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4879-2687</contrib-id><name-alternatives><name xml:lang="en"><surname>Bolotina</surname><given-names>L. V.</given-names></name><name xml:lang="ru"><surname>Болотина</surname><given-names>Л. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>3 2nd Botkinskiy Proezd, Moscow, 125284</p></bio><bio xml:lang="ru"><p>125284, Москва, 2-й Боткинский пр-д, 3</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0307-8252</contrib-id><name-alternatives><name xml:lang="en"><surname>Rasskazova</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Рассказова</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>3 2nd Botkinskiy Proezd, Moscow, 125284</p></bio><bio xml:lang="ru"><p>125284 Москва, 2-й Боткинский пр-д, 3</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0007-6233-5024</contrib-id><name-alternatives><name xml:lang="en"><surname>Sipki</surname><given-names>V. N.</given-names></name><name xml:lang="ru"><surname>Сипки</surname><given-names>В. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p> 3 2nd Botkinskiy Proezd, Moscow, 125284</p></bio><bio xml:lang="ru"><p>125284, Москва, 2-й Боткинский пр-д, 3</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8783-9738</contrib-id><name-alternatives><name xml:lang="en"><surname>Maksimov</surname><given-names>K. V.</given-names></name><name xml:lang="ru"><surname>Максимов</surname><given-names>К. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>3 2nd Botkinskiy Proezd, Moscow, 125284</p></bio><bio xml:lang="ru"><p>125284, Москва, 2-й Боткинский пр-д, 3</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7141-2502</contrib-id><name-alternatives><name xml:lang="en"><surname>Zikiryakhodzhaev</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Зикиряходжаев</surname><given-names>А. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>3 2nd Botkinskiy Proezd, Moscow, 125284</p><p>Build. 2, 8 Trubetskaya St., Moscow, 119991</p><p>6 Miklukho-Maklaya St., Moscow, 117198</p></bio><bio xml:lang="ru"><p>125284, Москва, 2-й Боткинский пр-д, 3</p><p>119991, Москва, ул. Трубецкая, 8, стр. 2</p><p>117198, Москва, ул. МиклухоМаклая, 6</p></bio><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">P.A. Hertsen Moscow Oncology Research Institute – branch of the National Medical Research Radiological Center, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">Московский научно-исследовательский онкологический институт им. П.А. Герцена – филиал ФГБУ «Национальный медицинский исследовательский центр радиологии» Минздрава России</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">I.M. Sechenov First Moscow State Medical University of the Ministry of Health of Russia (Sechenov University</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО Первый Московский государственный медицинский университет им. И.М. Сеченова Минздрава России (Сеченовский Университет</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">People’s Friendship University of Russia n. a. Patrice Lumumba</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Российский университет дружбы народов им. Патриса Лумумбы»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-01-16" publication-format="electronic"><day>16</day><month>01</month><year>2025</year></pub-date><volume>4</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>41</fpage><lpage>46</lpage><history><date date-type="received" iso-8601-date="2025-01-15"><day>15</day><month>01</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-01-15"><day>15</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, ABV-Press</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, АБВ-пресс</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">ABV-Press</copyright-holder><copyright-holder xml:lang="ru">АБВ-пресс</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://mdonco.abvpress.ru/jour/about/editorialPolicies</ali:license_ref></license></permissions><self-uri xlink:href="https://mdonco.abvpress.ru/jour/article/view/156">https://mdonco.abvpress.ru/jour/article/view/156</self-uri><abstract xml:lang="en"><p><bold>Aim.</bold> To study the role of progesterone receptor expression, tumor grade and Ki-67 level as possible predictors of pathological complete response (pCR) to neoadjuvant chemotherapy in patients with stage IIA–IIB (cT1–2N1, cT2–3N0M0) breast cancer of hormone-positive HER2-negative subtype.</p><p><bold>Materials and methods</bold>. We retrospectively analysed the efficacy of neoadjuvant chemotherapy (4AC+12P/4T) in 100 patients with cancer stages IIA–IIB (cT1–2N1, cT2–3N0M0) of hormone-positive HER2-negative subtype treated at the P.A. Hertsen Moscow Oncology Research Institute from 2013 to 2022. The pathological response to neoadjuvant chemotherapy depending on the level of progesterone receptor expression, tumour grade (G) and tumour proliferation index (Ki-67) were evaluated.</p><p><bold>Results.</bold> Pathological complete response was achieved in 12 of 100 patients. The progesterone receptor expression ≤3 Allred pCR scores were found in 16.1 % (5/31) of patients, whereas with progesterone receptor &gt;3 scores in 10.1 % (7/69) (odds ratio 1.703; 95 % confidence interval (CI) 0.495–5.860; p = 0.507). Patients with high tumour grade (G3) achieved pCR in 12.1 % (4/33) cases and with G2 – in 11.9 % (8/67) (odds ratio 1.017; 95 % CI 0.283–3.658; p = 1.000). With the Ki-67 levels ≥50 % pCR was achieved in 14.6 % (7/48) cases compared to 9.6 % (5/52) with Ki-67 levels &lt;50 %(odds ratio 1.605; 95 % CI 0.473–5.445; p = 0.544). The Ki-67 threshold for achieving pCR was 70 % (area under the ROC curve 0.663 ± 0.090; 95 % CI 0.486–0.840; p = 0.068) and for progesterone receptors was 3 points (area under the ROC curve 0.625 ± 0.080; 95 % CI 0.467–0.782; p = 0.156).</p><p><bold>Conclusion.</bold> This analysis highlights the importance of considering all clinical and morphological characteristics of the tumour when planning the scope of treatment for hormone-positive HER2-negative breast cancer. The results obtained may serve as a basis for a more personalised therapeutic approach.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель исследования</bold> – изучить роль экспрессии рецепторов прогестерона, гистологической степени злокачественности и уровня Ki-67 как возможных предикторов полного патоморфологического ответа (pCR) на неоадъювантную химиотерапию у больных раком молочной железы IIA–IIB (сT1–2N1, cT2–3N0M0) стадий, гормон-положительного HER2-отрицательного подтипа.</p><p><bold>Материалы и методы.</bold> Проведен ретроспективный анализ эффективности неоадъювантной химиотерапии (4AC+12P/4T) у 100 больных раком молочной железы IIA–IIB (сT1–2N1, cT2–3N0M0) стадий, гормон-положительного HER2-отрицательного подтипа, получавших лечение в МНИОИ им. П.А. Герцена с 2013 по 2022 г. Оценен патоморфологический ответ на неоадъювантную химиотерапию в зависимости от уровня экспрессии рецепторов прогестерона, степени злокачественности опухоли (G) и индекса пролиферации опухоли (Ki-67).</p><p><bold>Результаты.</bold> Полный патоморфологический ответ достигнут у 12 из 100 больных. С экспрессией рецепторов прогестерона ≤3 баллов по шкале Allred pCR достигнут у 16,1 % (5/31) пациенток, в то время как с экспрессией &gt;3 баллов – у 10,1 % (7/69) (отношение шансов (ОШ) 1,703; 95 % доверительный интервал (ДИ) 0,495–5,860; p = 0,507). Пациентки с опухолью высокой степени злокачественности (G3) достигли pCR в 12,1 % (4/33) случаев, а G2 – в 11,9 % (8/67) (ОШ 1,017; 95 % ДИ 0,283–3,658; p = 1,000). При уровне Ki-67 ≥50 % pCR достигнут в 14,6 % (7/48) случаев по сравнению с Ki-67≥50 % – в 9,6 % (5/52) (ОШ 1,605; 95 % ДИ 0,473–5,445; p = 0,544). Пороговое значение уровня Ki-67 для достижения pCR составило 70 % (площадь под ROC-кривой 0,663 ± 0,090; 95 % ДИ 0,486–0,840; p = 0,068), а для экспрессии рецепторов прогестерона – 3 балла (площадь под ROC-кривой 0,625 ± 0,080; 95 % ДИ 0,467–0,782; p = 0,156).</p><p><bold>Заключение.</bold> Полученные результаты подчеркивают важность учета всех клинико-морфологических характеристик опухоли при планировании объема лечения гормон-положительного HER2-отрицательного рака молочной железы и могут служить основой для более персонализированного терапевтического подхода.</p></trans-abstract><kwd-group xml:lang="en"><kwd>breast cancer</kwd><kwd>neoadjuvant chemotherapy</kwd><kwd>hormone-positive tumour</kwd><kwd>pathological complete response</kwd><kwd>Ki-67</kwd><kwd>progesterone receptor</kwd><kwd>tumor grade</kwd><kwd>predictor of response</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рак молочной железы</kwd><kwd>неоадъювантная химиотерапия</kwd><kwd>гормон-положительная опухоль</kwd><kwd>полный патоморфологический ответ</kwd><kwd>Ki-67</kwd><kwd>рецептор прогестерона</kwd><kwd>степень злокачественности</kwd><kwd>предиктор ответа</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Malignant neoplasms in Russia in 2023 (morbidity and mortality). 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