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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Pediatric Traumatology, Orthopaedics and Reconstructive Surgery</journal-id><journal-title-group><journal-title xml:lang="en">Pediatric Traumatology, Orthopaedics and Reconstructive Surgery</journal-title><trans-title-group xml:lang="ru"><trans-title>Ортопедия, травматология и восстановительная хирургия детского возраста</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title>Pediatric Traumatology, Orthopaedics and Reconstructive Surgery</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2309-3994</issn><issn publication-format="electronic">2410-8731</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">705370</article-id><article-id pub-id-type="doi">10.17816/PTORS705370</article-id><article-id pub-id-type="edn">GZAXST</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Clinical studies</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Клинические исследования</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="zh"><subject>Clinical studies</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Methotrexate discontinuation in patients with non-systemic forms of juvenile idiopathic arthritis</article-title><trans-title-group xml:lang="ru"><trans-title>Отмена терапии метотрексатом у пациентов с несистемными формами ювенильного идиопатического артрита</trans-title></trans-title-group><trans-title-group xml:lang="zh"><trans-title/></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7749-6663</contrib-id><contrib-id contrib-id-type="spin">2449-0294</contrib-id><name-alternatives><name xml:lang="en"><surname>Raupov</surname><given-names>Rinat K.</given-names></name><name xml:lang="ru"><surname>Раупов</surname><given-names>Ринат Каусарович</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine)</p></bio><bio xml:lang="ru"><p>канд. мед. наук</p></bio><email>rinatraup94@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4235-5048</contrib-id><contrib-id contrib-id-type="spin">7125-4930</contrib-id><name-alternatives><name xml:lang="en"><surname>Vissarionov</surname><given-names>Sergei V.</given-names></name><name xml:lang="ru"><surname>Виссарионов</surname><given-names>Сергей Валентинович</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Professor, Corresponding Member of RAS</p></bio><bio xml:lang="ru"><p>д-р мед. наук, профессор, чл.-корр. РАН</p></bio><email>vissarionovs@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-8712-4959</contrib-id><name-alternatives><name xml:lang="en"><surname>Orlova</surname><given-names>Mariia V.</given-names></name><name xml:lang="ru"><surname>Орлова</surname><given-names>Мария Владимировна</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>o.mari001@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6834-1413</contrib-id><contrib-id contrib-id-type="spin">4152-4976</contrib-id><name-alternatives><name xml:lang="en"><surname>Dubko</surname><given-names>Margarita F.</given-names></name><name xml:lang="ru"><surname>Дубко</surname><given-names>Маргарита Фёдоровна</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Medicine), Assistant Professor</p></bio><bio xml:lang="ru"><p>канд. мед. наук, доцент</p></bio><email>mf-dubko@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1180-8086</contrib-id><contrib-id contrib-id-type="spin">7257-0795</contrib-id><name-alternatives><name xml:lang="en"><surname>Kostik</surname><given-names>Mikhail M.</given-names></name><name xml:lang="ru"><surname>Костик</surname><given-names>Михаил Михайлович</given-names></name><name xml:lang="zh"><surname></surname><given-names></given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Dr. Sci. (Medicine), Assistant Professor</p></bio><bio xml:lang="ru"><p>д-р мед. наук, доцент</p></bio><email>kost-mikhail@yandex.ru</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">H. Turner National Medical Research Center for Children’s Orthopedics and Trauma Surgery</institution></aff><aff><institution xml:lang="ru">Национальный медицинский исследовательский центр детской травматологии и ортопедии им. Г.И. Турнера</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Saint Petersburg State Pediatric Medical University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный педиатрический медицинский университет</institution></aff><aff><institution xml:lang="zh"></institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Saint Petersburg State Pediatric Medical University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный педиатрический медицинский университет</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-06-09" publication-format="electronic"><day>09</day><month>06</month><year>2026</year></pub-date><pub-date date-type="pub" iso-8601-date="2026-07-12" publication-format="electronic"><day>12</day><month>07</month><year>2026</year></pub-date><volume>14</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>168</fpage><lpage>176</lpage><history><date date-type="received" iso-8601-date="2026-04-02"><day>02</day><month>04</month><year>2026</year></date><date date-type="accepted" iso-8601-date="2026-06-02"><day>02</day><month>06</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026,</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Эко-Вектор</copyright-statement><copyright-statement xml:lang="zh">Copyright ©; 2026,</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Эко-Вектор</copyright-holder><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://eco-vector.com/for_authors.php#07</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/turner/article/view/705370">https://journals.eco-vector.com/turner/article/view/705370</self-uri><abstract xml:lang="en"><p><bold>BACKGROUND:</bold> Inactive disease or remission is often achieved on treatment in patients with juvenile idiopathic arthritis (JIA). Methotrexate is the most commonly used disease-modifying antirheumatic drug (DMARD) in JIA, and issues of dosing regimen modification in patients in prolonged remission remain relevant.</p> <p><bold>AIM:</bold> To study the outcomes of articular forms of juvenile idiopathic arthritis in patients who received methotrexate therapy and to identify predictors of clinical remission off medication.</p> <p><bold>METHODS:</bold> This retrospective study included 155 patients with articular forms of juvenile idiopathic arthritis who received methotrexate therapy. Baseline clinical and laboratory characteristics were assessed, reasons for methotrexate discontinuation were analyzed, and predictors of drug-free remission were identified.</p> <p><bold>RESULTS:</bold> Clinical remission on medication was achieved in 69 of 155 (44.5%) patients. A total of 71 of 155 patients discontinued methotrexate: 45 (62.5%) due to remission, 13 (18.1%) due to intolerance, 3 (4.2%) due to elevated liver enzyme levels, 1 (1.4%) due to frequent upper respiratory tract infections, and in 9 cases (12.5%) parents discontinued therapy independently. In the remission discontinuation group, a comparative analysis of baseline characteristics was performed in patients who subsequently developed flare (25 of 35; 71.4%) versus those who did not develop flare (10 of 35; 28.6%) at the time of last follow-up, with exclusion of patients receiving biologic DMARDs at the time of methotrexate discontinuation (<italic>n</italic> = 4) and those with less than 18 months of follow-up after discontinuation (<italic>n</italic> = 6). The median time to flare was 9 [4; 20] months. Follow-up duration for patients who did and did not experience flare after methotrexate discontinuation was 25.5 [23.1; 28.6] and 30.4 [22.8; 61.3] months, respectively. Both patient groups were comparable with respect to treatment profile, follow-up duration after methotrexate discontinuation, and baseline clinical and laboratory characteristics. Patients who subsequently experienced flare more frequently received intra-articular corticosteroid injections at disease onset (60% vs. 0%, <italic>p</italic> &lt; 0.001) and had a shorter duration of methotrexate therapy after achieving remission (34 months vs. 44 months, <italic>p</italic> = 0.079) compared with patients without flare. Most patients with flare (21 of 25; 85%) resumed methotrexate treatment, which was effective in 75% of patients; 7 of 21 patients subsequently required initiation of biologic therapy.</p> <p><bold>CONCLUSION:</bold> Patients who did not receive intra-articular corticosteroids at disease onset and had a longer duration of methotrexate therapy after achieving remission demonstrated a lower risk of juvenile idiopathic arthritis flare.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Обоснование.</bold> У пациентов с ювенильным идиопатическим артритом нередко удаётся достичь неактивного течения заболевания или ремиссии на фоне терапии. Метотрексат является наиболее часто применяемым базисным препаратом при ювенильном идиопатическом артрите, и вопросы модификации режима дозирования у пациентов, находящихся в длительной ремиссии, остаются актуальными.</p> <p><bold>Цель исследования.</bold> Изучить исходы течения суставных форм ювенильного идиопатического артрита у пациентов, получавших терапию метотрексатом, и определить предикторы безмедикаментозной ремиссии.</p> <p><bold>Методы.</bold> В ретроспективное исследование включено 155 пациентов с суставными формами ювенильного идиопатического артрита, получавших терапию метотрексатом. Проводилась оценка исходных клинико-лабораторных характеристик, анализ причин отмены метотрексата и поиск предикторов безлекарственной ремиссии.</p> <p><bold>Результаты.</bold> Медикаментозная ремиссия была достигнута у 69 из 155 (44,5%) пациентов. 71 из 155 пациентов прекратил приём метотрексата. Из них 45 (62,5%) — в связи с ремиссией, 13 (18,1%) — из-за непереносимости, 3 (4,2%) — вследствие повышения уровня печёночных ферментов, у 1 (1,4%) — в связи с частыми простудными заболеваниями, а в 9 случаях (12,5%) родители самостоятельно отменяли терапию. В группе пациентов, отменивших метотрексат в связи с ремиссией, проведён сравнительный анализ исходных характеристик пациентов, у которых впоследствии произошло (25 из 35; 71,4%) и не произошло обострение заболевания (10 из 35; 28,6%) к моменту последнего наблюдения, с исключением из анализа пациентов, получавших терапию генно-инженерными биологическими препаратами (<italic>n</italic>=4) на момент отмены метотрексата и с длительностью наблюдения после его отмены менее 18 мес (<italic>n</italic>=6). Медиана времени до обострения составила 9 [4; 20] мес. Длительность наблюдения за пациентами, которые имели и не имели обострения после отмены метотрексата, составила 25,5 [23,1; 28,6] и 30,4 [22,8; 61,3] мес. соответственно. Обе группы пациентов были сопоставимы по профилю терапии, длительности наблюдения после отмены метотрексата, а также по исходным клинико-лабораторным характеристикам. Пациенты, впоследствии имевшие обострение, чаще получали внутрисуставные введения кортикостероидов в дебюте заболевания (60% против 0%, <italic>p</italic> &lt; 0,001), а также имели меньшую продолжительность терапии метотрексатом после достижения ремиссии (34 мес. против 44 мес., <italic>p</italic>=0,079) по сравнению с пациентами, не имевшими обострения. Большинство пациентов с обострением (21 из 25; 85%) возобновили лечение метотрексатом, которое было эффективно у 75% пациентов, 7 из 21 пациентов в последующем потребовалась инициация биологической терапии.</p> <p><bold>Заключение.</bold> Пациенты без применения внутрисуставных кортикостероидов в дебюте заболевания и с большей продолжительностью терапии метотрексатом после наступления ремиссии демонстрировали меньший риск обострения ювенильного идиопатического артрита.</p></trans-abstract><trans-abstract xml:lang="zh"><p/></trans-abstract><kwd-group xml:lang="en"><kwd>juvenile idiopathic arthritis</kwd><kwd>remission</kwd><kwd>methotrexate</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ювенильный идиопатический артрит</kwd><kwd>ремиссия</kwd><kwd>метотрексат</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Prakken B, Albani S, Martini A. Juvenile idiopathic arthritis. 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