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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">bloodjour</journal-id><journal-title-group><journal-title xml:lang="ru">Гематология и трансфузиология</journal-title><trans-title-group xml:lang="en"><trans-title>Russian journal of hematology and transfusiology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0234-5730</issn><issn pub-type="epub">2411-3042</issn><publisher><publisher-name>ООО Издательский дом «Практика»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.35754/0234-5730-2022-67-3-351-366</article-id><article-id custom-type="elpub" pub-id-type="custom">bloodjour-383</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>Возможность наблюдения в ремиссии без лечения больных хроническим миелолейкозом со стабильным глубоким молекулярным ответом по данным российской части международного многоцентрового популяционного исследования EUTOS PBS</article-title><trans-title-group xml:lang="en"><trans-title>Observation in a treatment-free remission in chronic myeloid leukemia patients with a stable deep molecular response in the Russian portion of the international multicenter population based study EUTOS PBS</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6423-1789</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Челышева</surname><given-names>Е. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Chelysheva</surname><given-names>E. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Челышева Екатерина Юрьевна, доктор медицинских наук, ведущий научный сотрудник отдела диагностики и лечения гематологических заболеваний</p><p>125167, Москва</p></bio><bio xml:lang="en"><p>Ekaterina Yu. Chelysheva, Dr. Sci. (Med.), Leading Researcher, Department of Diagnostics and Treatment of Hematology Diseases</p><p>125167, Moscow</p></bio><email xlink:type="simple">denve@bk.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/0000-0002-0889-0445</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лазарева</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Lazareva</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лазарева Ольга Вениаминовна, кандидат медицинских наук, руководитель управления регионального и межведомственного сотрудничества по профилю «гематология»</p><p>125167, Москва</p></bio><bio xml:lang="en"><p>Olga V. Lazareva, Cand. Sci. (Med.), Head of the Department of regional and interdepartmental extension on the proﬁle “Hematology”</p><p>125167, Moscow</p></bio><email xlink:type="simple">stakhino@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Туркина</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Turkina</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Туркина Анна Григорьевна, доктор медицинских наук, профессор, руководитель клинико-диагностического отдела гематологии миелопролиферативных заболеваний</p><p>125167, Москва</p></bio><bio xml:lang="en"><p>Anna G. Turkina, Dr. Sci. (Med.), Professor, Head of the Clinical and Diagnostic Department of Hematology of Myeloproliferative Diseases</p><p>125167, Moscow</p></bio><email xlink:type="simple">turkianna@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/0000-0002-3669-0141</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Виноградова</surname><given-names>О. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Vinogradova</surname><given-names>O. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Виноградова Ольга Юрьевна, доктор медицинских наук, заведующая Московским городским гематологическим центром; профессор кафедры онкологии, гематологии и лучевой терапии; главный научный сотрудник отдела кооперативных исследований в гематологии и онкологии у подростков и взрослых</p><p>125284, Москва</p><p>117997, Москва</p><p>117997, Москва</p></bio><bio xml:lang="en"><p>Olga Yu. Vinogradova, Dr. Sci. (Med.), Head of the Moscow City Hematology Center; Professor of the Department of Oncology, Hematology and Radiation Therapy; Chief Researcher, Department of Cooperative Research in Hematology and Oncology in Adolescents and Adults</p><p>125284, Moscow</p><p>117997, Moscow</p><p>117997, Moscow</p></bio><email xlink:type="simple">olgavinz@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0805-150X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гаврилова</surname><given-names>Л. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Gavrilova</surname><given-names>L. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гаврилова Любовь Владимировна, кандидат медицинских наук, гематолог</p><p>430032, Саранск</p></bio><bio xml:lang="en"><p>Lyubov V. Gavrilova, Cand. Sci. (Med.), Hematologist</p><p>430032, Saransk</p></bio><email xlink:type="simple">LVG9@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5375-0273</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Галайко</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Galayko</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Галайко Мария Владимировна, гематолог</p><p>129128, Москва</p><p> </p></bio><bio xml:lang="en"><p>Mariya V. Galayko, Hematologist</p><p>129128, Moscow</p></bio><email xlink:type="simple">loima@mail.ru</email><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2900-2101</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дашеева</surname><given-names>Д. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Dasheeva</surname><given-names>D. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дашеева Долгоржап Баторовна, гематолог, ГУЗ «Забайкальский краевой онкологический диспансер»</p><p>672012, Чита</p></bio><bio xml:lang="en"><p>Dolgorzhap B. Dasheeva, Hematologist</p><p>672012, Chita</p></bio><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5016-210X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лучинин</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Luchinin</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лучинин Александр Сергеевич, кандидат медицинских наук, гематолог клинико-диагностического отделения</p><p>610027, Киров</p></bio><bio xml:lang="en"><p>Alexander S. Luchinin, Cand. Sci. (Med.), Hematologist, Clinical Diagnostic Department</p><p>610027, Kirov</p></bio><email xlink:type="simple">glivec@mail.ru</email><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2063-2411</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мересий</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Meresiy</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мересий Сергей Васильевич, гематолог, ГБУЗ Пермского края «Клиническая медико-санитарная часть № 1»</p><p>Пермь</p></bio><bio xml:lang="en"><p>Sergey V. Meresiy, Hematologist</p><p> Perm</p></bio><email xlink:type="simple">meresiy@mail.ru</email><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3382-3284</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сендерова</surname><given-names>О. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Senderova</surname><given-names>O. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сендерова Ольга Михайловна, кандидат медицинских наук, гематолог</p><p>664003, Иркутск</p></bio><bio xml:lang="en"><p>Olga M. Senderova, Cand. Sci. (Med.), Hematologist</p><p>664003, Irkutsk</p><p> </p></bio><email xlink:type="simple">o_senderova@mail.ru</email><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2859-4229</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шутылев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shutylev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шутылев Антон Аркадьевич, гематолог</p><p>614990, Пермь</p></bio><bio xml:lang="en"><p>Anton A. Shutylev, Hematologist</p><p>614990, Perm</p></bio><email xlink:type="simple">ashutylev@yandex.ru</email><xref ref-type="aff" rid="aff-9"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0735-5694</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Куликовский</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kulikovskiy</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Куликовский Антон Анатольевич, ведущий специалист информационно-аналитического отдела</p><p>125167, Москва</p></bio><bio xml:lang="en"><p>Anton A. Kulikovskiy, Leading Specialist, Information and Analysis Department</p><p>125167, Moscow</p></bio><email xlink:type="simple">kulitosha@yandex.ru</email><xref ref-type="aff" rid="aff-10"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Куликов</surname><given-names>С. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kulikov</surname><given-names>S. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Куликов Сергей Михайлович, кандидат технических наук, начальник информационно-аналитического отдела</p><p>125167, Москва</p></bio><bio xml:lang="en"><p>Sergei M. Kulikov, Cand. Sci. (Eng.), Head of the Information and Analysis Department</p><p>125167, Moscow</p></bio><email xlink:type="simple">smkulikov@mail.ru</email><xref ref-type="aff" rid="aff-10"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «Национальный медицинский исследовательский центр гематологии» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center for Hematology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ГБУЗ «Городская клиническая больница имени С.П. Боткина» Департамента здравоохранения города Москвы; ГБОУ ВПО «Российский национальный исследовательский медицинский университет имени Н.И. Пирогова»; ФГБУ «Федеральный научно-клинический центр детской гематологии, онкологии и иммунологии им. Дмитрия Рогачева»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>S.P. Botkin City Clinical Hospital; Russian National Research Medical University named after N.I. Pirogov; Dmitry Rogachev National Medical Research Centre of Pediatric Hematology, Oncology and Immunology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>ГБУЗ Республики Мордовия «Республиканская клиническая больница № 4»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Republican Clinical Hospital No. 4 of Mordovia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>НУЗ «Центральная клиническая больница № 2 им. Н.А. Семашко» ОАО «РЖД»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.A. Semashko Central Clinical Hospital No. 2, JSC Russian Railways</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>ГУЗ «Забайкальский краевой онкологический диспансер»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Trans-Baikal Regional Oncology Centre</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-6"><aff xml:lang="ru"><institution>ФГБУН «Кировский научно-исследовательский институт гематологии и переливания крови» Федерального медико-биологического агентства России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kirov Research Institute of Hematology and Blood Transfusion</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-7"><aff xml:lang="ru"><institution>ГБУЗ Пермского края «Клиническая медико-санитарная часть № 1»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Clinical Medical Unit No. 1 of Perm Krai</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-8"><aff xml:lang="ru"><institution>ГБУЗ «Иркутская ордена «Иркутская «Знак Почета» областная клиническая больница»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Irkutsk Regional Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-9"><aff xml:lang="ru"><institution>ГБУЗ «Пермская ордена «Знак Почета» краевая клиническая больница»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Perm Regional Clinical Hospital</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-10"><aff xml:lang="ru"><institution>ФГБУ «Национальный медицинский исследовательский центр гематологии» Министерства здравоохранения Российской Федерации</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Centre of Hematology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>22</day><month>10</month><year>2022</year></pub-date><volume>67</volume><issue>3</issue><elocation-id>351–366</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Челышева Е.Ю., Лазарева О.В., Туркина А.Г., Виноградова О.Ю., Гаврилова Л.В., Галайко М.В., Дашеева Д.Б., Лучинин А.С., Мересий С.В., Сендерова О.М., Шутылев А.А., Куликовский А.А., Куликов С.М., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Челышева Е.Ю., Лазарева О.В., Туркина А.Г., Виноградова О.Ю., Гаврилова Л.В., Галайко М.В., Дашеева Д.Б., Лучинин А.С., Мересий С.В., Сендерова О.М., Шутылев А.А., Куликовский А.А., Куликов С.М.</copyright-holder><copyright-holder xml:lang="en">Chelysheva E.Y., Lazareva O.V., Turkina A.G., Vinogradova O.Y., Gavrilova L.V., Galayko M.V., Dasheeva D.B., Luchinin A.S., Meresiy S.V., Senderova O.M., Shutylev A.A., Kulikovskiy A.A., Kulikov S.M.</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.htjournal.ru/jour/article/view/383">https://www.htjournal.ru/jour/article/view/383</self-uri><abstract><sec><title>Введение</title><p>Введение. Учитывая возможность сохранения молекулярной ремиссии у 40–60 % больных хроническим миелолейкозом (ХМЛ) со стабильным глубоким молекулярным ответом (МО) после отмены терапии ингибиторами тирозинкиназ (ИТК), актуальным является определение числа кандидатов для наблюдения в ремиссии без лечения (РБЛ) и сроков отмены терапии.</p><p>Цель — оценить вероятности достижения стабильного глубокого МО и определить долю больных, соответствующих критериям наблюдения в РБЛ, в российской части международного многоцентрового проспективного популяционного исследования EUTOS PBS (European Treatment and Outcome Study — Population-Based Study).</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Регистрацию всех случаев ХМЛ в исследовании EUTOS PBS проводили с сентября 2009 г. по декабрь 2012 г. в 6 регионах России. Основным критерием включения в исследование являлся диагноз ХМЛ, подтвержденный с помощью цитогенетического или молекулярно-генетического исследования у больных старше 18 лет. Исследуемую группу составили 197 больных ХМЛ: 181 (92 %) больной с хронической фазой (ХФ) ХМЛ, 14 (7 %) — с фазой акселерации (ФА) и 2 (1 %) — с бластным кризом (БК) на момент верификации диагноза. Обновление данных о терапии и ее результатах проводили ежегодно.</p></sec><sec><title>Результаты</title><p>Результаты. При медиане срока наблюдения за больными 7 лет (диапазон — от 3 мес. до 10 лет) глубокий МО (как минимум МО4 или уровень BCR::ABL1 менее 0,01 % IS) был достигнут у 104 (54 %) из 192 больных, получавших терапию ИТК. Вероятность достижения глубокого МО через 5 лет составила 48 % (95%-ный доверительный интервал (95% ДИ): 40–55 %) у больных в ХФ. Кумулятивная частота достижения стабильного глубокого МО длительностью более 2 лет у больных в ХФ ХМЛ составила 16 % (95% ДИ: 11–22 %) через 5 лет терапии, 29 % (95% ДИ: 22–37 %) через 7 лет терапии и 50 % (95% ДИ: 38–60 %) через 9 лет терапии ИТК. У больных с глубоким МО через 36 мес. терапии вероятность достичь в последующем статуса стабильного глубокого МО была достоверно выше, чем у больных, у которых был достигнут только большой МО (БМО) к этому сроку наблюдения: 40 % (95% ДИ: 28–53 %) против 3 % (95% ДИ: 0–13 %) через 5 лет терапии; 66 % (95% ДИ: 52–77 %) против 15 % (95% ДИ: 5–30 %) через 7 лет и 89 % (95% ДИ: 64–97 %) против 48 % (95% ДИ: 25–67 %) через 9 лет (p &lt; 0,0001). У больных без БМО к 36 мес. терапии стабильный глубокий МО впоследствии не был получен. Критериям отмены ИТК для перевода в фазу наблюдения в РБЛ, включающим в себя ХФ ХМЛ с типичным транскриптом BCR::ABL1 p210, терапию ИТК более 3 лет и стабильный глубокий МО более 2 лет, соответствовали 54 больных. Доля возможных кандидатов для отмены терапии составила 28 % от всех 192 больных, получавших терапию ИТК в исследовании или 31 % в пересчете на больных только с ХФ ХМЛ. Среди потенциальных кандидатов для отмены ИТК преобладали больные из группы низкого риска по шкале Sokal или ELTS: 26 (48 %) и 33 (61 %) соответственно; больных с длительно существующей резистентностью к терапии не было.</p></sec><sec><title>Заключение</title><p>Заключение. В российской части проспективного наблюдательного многоцентрового исследования EUTOS PBS установлено, что при медиане срока терапии ИТК 7 лет около трети больных с ХФ ХМЛ могут являться кандидатами для контролируемой отмены терапии. При сохранении у половины из этих больных молекулярной ремиссии продолжить наблюдение в РБЛ смогут до 15 % от изначального числа больных. Достижение БМО и глубокого МО через 36 мес. терапии ассоциировано с достоверно большей вероятностью соответствия критериям наблюдения в фазе РБЛ в последующем.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Given the possibility of preserving molecular remission in 40–60 % of patients with chronic myeloid leukemia (CML) with a stable deep molecular response (MR) after discontinuation of tyrosine kinase inhibitors (TKI), it is important to determine the number of candidates for observation in a treatment-free remission (TFR) and terms of treatment cancellation.</p><p>Aim — to evaluate the probability of stable deep MR and the rate of patients who meet the criteria for TFR observation in the Russian part of the international multicenter prospective population study EUTOS PBS (European Treatment and Outcome Study — Population-Based Study).</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Registration of all CML cases in the EUTOS PBS was conducted in 6 regions of Russia from September 2009 to December 2012. The main inclusion criterion was the diagnosis of CML confirmed by cytogenetic or molecular study in patients aged over 18 years. In total, 197 CML patients were included: 181 (92 %) with chronic phase (CP) CML, 14 (7 %) with accelerated phase (AP) and 2 (1 %) with blast crisis (BC) at diagnosis. Data on therapy and results was updated annually.</p></sec><sec><title>Results</title><p>Results. Deep MR (at least MR4 or BCR::ABL1 level less than 0.01 % IS) was achieved in 104 (54 %) of 192 patients receiving TKI therapy, with a median observation period of 7 years (range from 3 months to 10 years). The probability of a deep MR after 5 years of treatment was 48 % (95 % confidence interval (95% CI): 40–55 %) in patients with CP. The cumulative incidence of a stable deep MR with duration of more than 2 years in CML CP patients was 16 % (95% CI: 11–22 %) after 5 years of therapy, 29 % (95% CI: 22–37 %) after 7 years of therapy and 50 % (95% CI: 38–60 %) after 9 years of therapy. The cumulative incidence of a stable deep MR was significantly higher in those patients who had achieved a deep MR at 36 months of therapy compared to patients with only MMR: 40 % (95% CI: 28–53 %) vs. 3 % (95% CI: 0–13 %) at 5 year of therapy; 66 % (95% CI: 52–77 %) vs. 15 % (95% CI: 5–30 %) at 7 year and 89 % (95% CI: 64–97 %) vs. 48 % (95% CI: 25–67 %) at 9 year (p &lt; 0.0001) in patients without MMR by 36 months. No patients without MMR at 36 months of therapy subsequently gained a stable deep MR. Fifty four patients met the TKI discontinuation criteria for transition into TFR phase: CP CML with a typical BCR::ABL1 p210 transcript, TKI therapy for more than 3 years and a stable deep MR for over 2 years. The rate of possible candidates for cancellation of therapy was 28 % of all 192 patients who received TKI in the study or 31 % in terms of patients with CP CML. Predominantly, patients with low-risk by Sokal or ELTS score were among the potential TFR candidates 26 (48 %) and 33 (61 %), respectively. No patients with long-term resistance to therapy were the TFR candidates.</p></sec><sec><title>Conclusion</title><p>Conclusion. In the Russian portion of the prospective observational multicenter study EUTOS PBS, it was found that with a median duration of TKI therapy of 7 years, about a third of patients with CP CML may be candidates for the controlled therapy discontinuation. If half of these patients remain in molecular remission, up to 15 % of the initial number of patients will be able to continue observation in the TFR. Achievement of MMR and deep MR at 36 months of therapy is associated with a significantly greater likelihood of meeting the criteria for follow-up in the TFR phase in the future.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>хронический миелолейкоз</kwd><kwd>ингибиторы тирозинкиназы</kwd><kwd>популяционное исследование</kwd><kwd>глубокий молекулярный ответ</kwd><kwd>ремиссия без лечения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>chronic myeloid leukemia</kwd><kwd>tyrosine kinase inhibitors</kwd><kwd>population base study</kwd><kwd>deep molecular response</kwd><kwd>treatment-free remission</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">Hochhaus A., Larson R.A., Guilhot F., et al. Long term outcomes of imatinib treatment for chronic myeloid leukemia. N Engl J Med. 2017; 376(10): 917–27. 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