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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">pmedpharm</journal-id><journal-title-group><journal-title xml:lang="ru">Фармация и фармакология</journal-title><trans-title-group xml:lang="en"><trans-title>Pharmacy &amp; Pharmacology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2307-9266</issn><issn pub-type="epub">2413-2241</issn><publisher><publisher-name>Pyatigorsk Medical and Pharmaceutical Institute - branch of Volgograd State Medical Univer</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.19163/2307-9266-2025-13-1-20-30</article-id><article-id custom-type="elpub" pub-id-type="custom">pmedpharm-1673</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>ОБЗОРЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>REVIEW</subject></subj-group></article-categories><title-group><article-title>Рациональный подход к редукции дозы ингибиторов CDK4/6 при лечении пациентов с распространённым раком молочной железы: описательный обзор</article-title><trans-title-group xml:lang="en"><trans-title>A rational approach to dose reduction of CDK4/6 inhibitors in the treatment of patients with advanced breast cancer: A narrative Review</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5384-9866</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дьяков</surname><given-names>И. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Dyakov</surname><given-names>I. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат биологических наук, генеральный директор АНО «Научно-практический центр исследования проблем рациональной фармакотерапии и фармакоэкономики»; ведущий научный сотрудник ФГБНУ «Научно-исследовательский институт вакцин и сывороток им. И.И. Мечникова».</p><p>1. Россия, 109052, г. Москва, ул. Подъёмная, д. 12, стр. 1.</p><p>2. Россия, 105064, г. Москва, Малый Казенный пер., д. 5А. </p></bio><bio xml:lang="en"><p>Candidate of Sciences (Biology), CEO of Scientific and Practical Center for the Study of Problems of Rational Pharmacotherapy and Pharmacoeconomics; Leading Researcher at the Mechnikov Research Institute of Vaccines and Sera.</p><p>1. 12 Podjyomnaya Str., bldg 1, Moscow, Russia, 109052.</p><p>2. 5A Maly Kazenniy Lane, Moscow, Russia, 105064.</p></bio><email xlink:type="simple">dyakov.ilya@npcpharmec.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/0000-0002-6348-6867</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Зырянов</surname><given-names>С. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Zyryanov</surname><given-names>S. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор медицинских наук, профессор, заведующий кафедрой общей и клинической фармакологии ФГАОУ ВО РУДН; заместитель главного врача по терапевтической помощи ГБУЗ «Городская клиническая больница № 24 ДЗМ». </p><p>1. Россия, 117198, г. Москва, ул. Миклухо-Маклая, д. 6.</p><p>2. Россия, 127015, г. Москва, ул. Писцовая, д. 10.</p></bio><bio xml:lang="en"><p>Doctor of Sciences (Medicine), Professor, Head of the Department of General and Clinical Pharmacology of RUDN University; Deputy Chief Physician for Therapeutic Care of City Clinical Hospital No. 24 (Moscow, Russia). </p><p>1. 6 Miklukho-Maklaya Str., Moscow, Russia, 117198.</p><p>2. 10 Pistsovaya Str., Moscow, Russia, 127015. </p></bio><email xlink:type="simple">zyryanov_sk@rudn.university</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>1. Автономная некоммерческая организация «Научно-практический центр исследования проблем рациональной фармакотерапии и фармакоэкономики».&#13;
2. Федеральное государственное бюджетное научное учреждение «Научно-исследовательский институт вакцин и сывороток им. И.И. Мечникова».</institution><country>Россия</country></aff><aff xml:lang="en"><institution>1. Scientific and Practical Center for the Study of Problems of Rational Pharmacotherapy and Pharmacoeconomics.&#13;
2. Mechnikov Scientific Research Institute for Vaccines and Sera.</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>1. Федеральное государственное автономное образовательное учреждение высшего образования «Российский университет дружбы народов имени Патриса Лумумбы».&#13;
2. Государственное бюджетное учреждение здравоохранения города Москвы «Городская клиническая больница № 24 Департамента здравоохранения города Москвы».</institution><country>Россия</country></aff><aff xml:lang="en"><institution>1. Peoples’ Friendship University (RUDN University).&#13;
2. City Clinical Hospital No. 24.</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>11</day><month>07</month><year>2025</year></pub-date><volume>13</volume><issue>1</issue><fpage>20</fpage><lpage>30</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дьяков И.Н., Зырянов С.К., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Дьяков И.Н., Зырянов С.К.</copyright-holder><copyright-holder xml:lang="en">Dyakov I.N., Zyryanov S.K.</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.pharmpharm.ru/jour/article/view/1673">https://www.pharmpharm.ru/jour/article/view/1673</self-uri><abstract><p>Применение ингибиторов CDK4/6 при лечении HR+/HER2– рака молочной железы (РМЖ) в последние годы получает все большее распространение. При оценке безопасности ингибиторов CDK4/6 было установлено, что в процессе терапии значительному числу пациентов требуется снижение первоначальной дозы препарата в связи с нежелательными явлениями (редукция дозы). Однако публикации, обобщающие такие данные отсутствуют. При этом время до редукции дозы, ее этапность, могут значительно влиять на процесс организации лекарственного обеспечения пациентов препаратами этой группы, оказывая экономический и административный эффект на систему здравоохранения. В связи с этим, проведение обзора представленных в литературе результатов применения ингибиторов CDK4/6, описывающих особенности снижения дозы, своевременно и актуально.</p><sec><title>Цель</title><p>Цель. Провести обзор литературы с целью обобщения и систематизации результатов применения ингибиторов CDK4/6, описывающих особенности редукции дозы.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Поиск литературы проводился в базах данных MedLine (PubMed) и Google Scholar с января 2016 по январь 2024 года. Литературный поиск был проведён по следующим поисковым запросам: «ribociclib OR palbociclib OR abemaciclib» AND «breast cancer and randomized clinical trial», «CDK4/6 inhibitors OR cyclin-dependent kinase 4/6 inhibitors» AND «metastatic breast cancer» AND «real-world» AND «dose Intensity OR dose reduction». В результате поиска было найдено 384 публикации, в финальный анализ попали 15 публикаций. Систематизацию данных о редукции доз проводили по следующим критериям: доля пациентов, которым выполнена первая и, при наличии, вторая редукция, время до редукции дозы, интенсивность дозирования.</p></sec><sec><title>Результаты</title><p>Результаты. Анализ данных рандомизированных клинических исследований показал, что снижение дозы потребовалось 31,8–57,4% пациентам при применении ингибиторов CDK4/6. При этом 17,4–40% пациентам было проведено второе снижение дозы. Медианное время до первого этапа редукции составило от 1,2 до 3,2 мес. Медиана относительной эффективности дозы находилась в интервале от 66,3 до 93,0%. По результатам анализа данных реальной клинической практики — 28,1–59,1% пациентам была проведена редукция дозы. При этом первый этап редукции осуществлялся на 1–3 мес. терапии, а второй — на 4–17 мес. с момента начала лечения.</p></sec><sec><title>Заключение</title><p>Заключение. Проведён обзор литературы для систематизации результатов применения ингибиторов CDK4/6, описывающих особенности редукции дозы. Примерно до 60% пациентов нуждаются в проведении редукции дозы вне зависимости от выбранного ингибитора CDK4/6. Данные о частоте и времени до снижения дозы разнятся, следовательно, необходимость редукции у отдельного пациента может возникнуть в любой момент, что может затруднять процесс планирования обеспечения препаратами противоопухолевой терапии.</p></sec></abstract><trans-abstract xml:lang="en"><p>The use of CDK4/6 inhibitors in the treatment of HR+/HER2– breast cancer (BC) has become increasingly widespread in recent years. When assessing the safety of CDK4/6 inhibitors, it was found that during therapy, a significant number of patients require a reduction in the initial dose of the drug due to adverse events (dose reduction), but publications summarizing such data are absent. At the same time, the time to dose reduction and its stages can significantly affect the organization of drug supply for patients with drugs of this group, having an economic and administrative effect on the healthcare system. In this regard, a review of the results of the use of CDK4/6 inhibitors presented in the literature, describing the features of dose reduction, is timely and relevant.</p><sec><title>The aim</title><p>The aim. To conduct a literature review in order to summarize and systematize the results of the use of CDK4/6 inhibitors, describing the features of dose reduction.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The literature search was carried out in the MedLine (PubMed) and Google Scholar databases from January 2016 to January 2024. The literature search was carried out using the following search queries: “ribociclib OR palbociclib OR abemaciclib” AND “breast cancer and randomized clinical trial”, “CDK4/6 inhibitors OR cyclin-dependent kinase 4/6 inhibitors” AND “metastatic breast cancer” AND “real-world” AND “dose Intensity OR dose reduction”. As a result of the search, 384 publications were found, and 15 publications were included in the final analysis. Data on dose reduction were systematized according to the following criteria: the proportion of patients who underwent the first and, if available, the second reduction, the time to dose reduction, and the intensity of dosing.</p></sec><sec><title>Results</title><p>Results. Analysis of data from randomized clinical trials showed that a dose reduction was required in 31.8–57.4% of patients using CDK4/6 inhibitors. At the same time, the second dose reduction was carried out in 17.4–40% of patients. The median time to the first stage of reduction ranged from 1.2 to 3.2 months. The median relative dose intensity ranged from 66.3 to 93.0%. According to the results of the analysis of real clinical practice data, dose reduction was carried out in 28.1–59.1% of patients. At the same time, the first stage of reduction was carried out at 1–3 months of therapy, and the second at 4–17 months from the start of treatment.</p></sec><sec><title>Conclusion</title><p>Conclusion. A literature review was conducted to systematize the results of the use of CDK4/6 inhibitors, describing the features of dose reduction. Approximately up to 60% of patients need a dose reduction, regardless of the selected CDK4/6 inhibitor. Data on the frequency and time to dose reduction vary; therefore, the need for reduction in an individual patient may arise at any time, which may complicate the process of planning the provision of anti-tumor therapy drugs.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>HR+/HER2–</kwd><kwd>рак молочной железы</kwd><kwd>ингибитор CDK4/6</kwd><kwd>абемациклиб</kwd><kwd>палбоциклиб</kwd><kwd>рибоциклиб</kwd><kwd>редукция дозы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>HR+/HER2–</kwd><kwd>breast cancer</kwd><kwd>CDK4/6 inhibitor</kwd><kwd>abemaciclib</kwd><kwd>palbociclib</kwd><kwd>ribociclib</kwd><kwd>dose reduction</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Данное исследование не имело финансовой поддержки от сторонних организаций.</funding-statement><funding-statement xml:lang="en">This study did not receive financial support from third-party organizations.</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">Viale G., Basik M., Niikura N., Tokunaga E., Brucker S., Penault-Llorca F., Hayashi N., Sohn J., Teixeira de Sousa R., Brufsky A.M., O’Brien C.S., Schmitt F., Higgins G., Varghese D., James G.D., Moh A., Livingston A., de Giorgio-Miller V. 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