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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">medinfo</journal-id><journal-title-group><journal-title xml:lang="ru">Актуальные проблемы теоретической и клинической медицины</journal-title><trans-title-group xml:lang="en"><trans-title>Actual Problems of Theoretical and Clinical Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2790-1289</issn><issn pub-type="epub">2790-1297</issn><publisher><publisher-name>Казахстанско-Российский медицинский университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.64854/2790-1289-2026-52-2-01</article-id><article-id custom-type="elpub" pub-id-type="custom">medinfo-1075</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 ИССЛЕДОВАНИЯ</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>ПРОГНОСТИЧЕСКАЯ ЗНАЧИМОСТЬ РЕЦЕПТОРНОГО СТАТУСА И ИНДЕКСА KI-67 ПРИ СТРАТИФИКАЦИИ РИСКА ЛЕТАЛЬНОГО ИСХОДА У ПАЦИЕНТОК С РАКОМ МОЛОЧНОЙ ЖЕЛЕЗЫ В РЕСПУБЛИКЕ КАЗАХСТАН (РЕЗУЛЬТАТЫ ОДНОФАКТОРНОГО АНАЛИЗА)</article-title><trans-title-group xml:lang="en"><trans-title>PROGNOSTIC SIGNIFICANCE OF RECEPTOR STATUS AND KI-67 INDEX IN RISK STRATIFICATION OF MORTALITY IN PATIENTS WITH BREAST CANCER IN THE REPUBLIC OF KAZAKHSTAN (RESULTS OF UNIVARIATE ANALYSIS)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7015-6770</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Новиков</surname><given-names>И. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Novikov</surname><given-names>I. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зам директора КГП на ПХВ "АРМК"</p><p>Докторант PhD</p></bio><email xlink:type="simple">igor-novikov-1982@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">КГП на ПХВ "Алматинская региональная многопрофильная клиника"<country>Казахстан</country></aff><aff xml:lang="en">NEI «Kazakh-Russian Medical University»<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>03</day><month>07</month><year>2026</year></pub-date><volume>0</volume><issue>2</issue><elocation-id>1075</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Новиков И., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Новиков И.</copyright-holder><copyright-holder xml:lang="en">Novikov I.</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://kazrosmedjournal.krmu.edu.kz/jour/article/view/1075">https://kazrosmedjournal.krmu.edu.kz/jour/article/view/1075</self-uri><abstract><sec><title>Актуальность</title><p>Актуальность. Рак молочной железы характеризуется выраженными различиями в клиническом течении и исходах, что обусловлено биологическим разнообразием опухолей. Молекулярно-биологические маркеры, включая рецепторный статус и индекс пролиферации Ki-67, играют ключевую роль в прогнозировании заболевания, однако их значимость может варьировать в зависимости от популяции. </p></sec><sec><title>Цель</title><p>Цель: Оценить прогностическую значимость рецепторного статуса (ER, PR, HER2) и индекса пролиферации Ki-67 при стратификации риска летального исхода у пациенток с раком молочной железы по результатам однофакторного анализа.</p><p>стратификации риска летального исхода у пациенток с раком молочной железы.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Проведен ретроспективный анализ когорты из 729 пациенток с первичным раком молочной железы, зарегистрированных в 2018-2022 гг. по данным онкологического регистра г. Алматы. Конечной точкой являлся летальный исход. Статистический анализ включал критерий χ², логистическую регрессию и ROC-анализ.</p></sec><sec><title>Результаты</title><p>Результаты. Статус ER и PR продемонстрировал статистически значимую ассоциацию с риском летального исхода (p &lt; 0,001): отрицательный рецепторный статус ассоциирован с более высоким риском смерти. В логистической регрессии установлено протективное значение экспрессии ER (Exp(B) = 0,883) и PR (Exp(B) = 0,424). ROC-анализ показал умеренную дискриминационную способность ER (AUC = 0,614) и PR (AUC = 0,622). HER2-статус не продемонстрировал статистически значимой связи с летальным исходом (p = 0,531). Индекс Ki-67 был статистически значимо ассоциирован с повышением риска летального исхода (Exp(B) = 1,015 на 1% увеличения; p &lt; 0,001), однако его дискриминационная способность по данным ROC-анализа была ограниченной (AUC = 0,606). Интегральный молекулярно-биологический фенотип также имел статистически значимую связь с исходом (p &lt; 0,001): наиболее благоприятный прогноз отмечен при люминальном A подтипе, тогда как тройной негативный фенотип ассоциирован с наихудшими исходами.</p></sec><sec><title>Вывод</title><p>Вывод. В однофакторном анализе рецепторный статус ER и PR, а также индекс Ki-67 были статистически значимо ассоциированы с летальным исходом у пациенток с раком молочной железы и могут рассматриваться как дополнительные маркеры стратификации риска. HER2-статус в данной когорте не продемонстрировал прогностической значимости.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Relevance</title><p>Relevance. Breast cancer is characterized by substantial heterogeneity in clinical course and outcomes, which is largely determined by the biological diversity of tumors. Molecular biological markers, including receptor status and the Ki-67 proliferation index, play a key role in disease prognosis; however, their significance may vary across populations.</p></sec><sec><title>Objective</title><p>Objective: To evaluate the prognostic significance of receptor status (ER, PR, HER2) and the Ki-67 proliferation index in the risk stratification of mortality among patients with breast cancer based on the results of univariate analysis.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. A retrospective cohort analysis was performed, including 729 patients with primary breast cancer registered between 2018 and 2022 according to the Almaty Cancer Registry. The primary endpoint was mortality. Statistical analysis included the chi-square test, logistic regression, and ROC analysis.</p></sec><sec><title>Results</title><p>Results. ER and PR status demonstrated a statistically significant association with mortality risk (p &lt; 0,001): negative receptor status was associated with a higher risk of death. Logistic regression revealed a protective effect of ER (Exp(B) = 0,883) and PR (Exp(B) = 0,424) expression. ROC analysis showed moderate discriminative ability for ER (AUC = 0,614) and PR (AUC = 0,622). HER2 status was not significantly associated with mortality (p = 0,531). The Ki-67 index was significantly associated with increased mortality risk (Exp(B) = 1,015 for each 1% increase; p &lt; 0,001), demonstrating moderate prognostic accuracy (AUC = 0,606). The integrated molecular-biological phenotype was also significantly associated with outcomes (p &lt; 0,001): the luminal A subtype showed the most favorable prognosis, whereas the triple-negative phenotype was associated with the poorest outcomes.</p></sec><sec><title>Conclusion</title><p>Conclusion. ER  and PR receptor status, as well as the Ki-67 index, are significant prognostic factors for mortality risk in breast cancer. HER2 status did not demonstrate prognostic significance in this cohort</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>рак молочной железы</kwd><kwd>рецепторный статус</kwd><kwd>ER</kwd><kwd>PR</kwd><kwd>HER2</kwd><kwd>Ki-67</kwd><kwd>прогноз</kwd><kwd>летальный исход</kwd><kwd>Казахстан.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>breast cancer</kwd><kwd>receptor status</kwd><kwd>ER</kwd><kwd>PR</kwd><kwd>HER2</kwd><kwd>Ki-67</kwd><kwd>prognosis</kwd><kwd>mortality</kwd><kwd>Kazakhstan.</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>не было</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">Łukasiewicz, S., Czeczelewski, M., Forma, A., Baj, J., Sitarz, R., &amp; Stanisławek, A. (2021). 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