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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="review-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Terapevticheskii arkhiv</journal-id><journal-title-group><journal-title xml:lang="en">Terapevticheskii arkhiv</journal-title><trans-title-group xml:lang="ru"><trans-title>Терапевтический архив</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0040-3660</issn><issn publication-format="electronic">2309-5342</issn><publisher><publisher-name xml:lang="en">LLC Obyedinennaya Redaktsiya</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">33694</article-id><article-id pub-id-type="doi">10.26442/00403660.2019.08.000378</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Editorial article</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Передовая статья</subject></subj-group><subj-group subj-group-type="article-type"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Hypervitaminosis B12 - a new marker and predictor of prognostically unfavorable diseases</article-title><trans-title-group xml:lang="ru"><trans-title>Гипервитаминоз В12 - новый маркер и предиктор прогностически неблагоприятных заболеваний</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Podzolkov</surname><given-names>V I</given-names></name><name xml:lang="ru"><surname>Подзолков</surname><given-names>Валерий Иванович</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.м.н., проф., зав. каф. факультетской терапии №2 лечебного факультета, директор клиники факультетской терапии УКБ №4; ORCID: 0000-0002-0758-5609</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dragomiretskaya</surname><given-names>N A</given-names></name><name xml:lang="ru"><surname>Драгомирецкая</surname><given-names>Наталья Александровна</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., доц. каф. факультетской терапии №2 лечебного факультета; тел: +7(925)519-56-50; e-mail: dragomiretskayanatalia@mail.ru; ORCID: 0000-0002-6531-6255</p></bio><email>dragomiretskaya_natalia@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dambaeva</surname><given-names>O Ts</given-names></name><name xml:lang="ru"><surname>Дамбаева</surname><given-names>Ольга Цереновна</given-names></name></name-alternatives><bio xml:lang="ru"><p>клинический ординатор каф. факультетской терапии №2 лечебного факультета</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Auvinen</surname><given-names>S T</given-names></name><name xml:lang="ru"><surname>Аувинен</surname><given-names>Сини Тамара</given-names></name></name-alternatives><bio xml:lang="ru"><p>студентка</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Medvedev</surname><given-names>I D</given-names></name><name xml:lang="ru"><surname>Медведев</surname><given-names>Иван Дмитриевич</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.м.н., доц. каф. факультетской терапии №2 лечебного факультета; ORCID: 0000-0003-4210-2841</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Sechenov First Moscow State Medical University (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><pub-date date-type="pub" iso-8601-date="2019-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2019</year></pub-date><volume>91</volume><issue>8</issue><issue-title xml:lang="en">VOL 91, NO8 (2019)</issue-title><issue-title xml:lang="ru">ТОМ 91, №8 (2019)</issue-title><fpage>160</fpage><lpage>167</lpage><history><date date-type="received" iso-8601-date="2020-04-16"><day>16</day><month>04</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Consilium Medicum</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, ООО "Консилиум Медикум"</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Consilium Medicum</copyright-holder><copyright-holder xml:lang="ru">ООО "Консилиум Медикум"</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://creativecommons.org/licenses/by-nc-sa/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://ter-arkhiv.ru/0040-3660/article/view/33694">https://ter-arkhiv.ru/0040-3660/article/view/33694</self-uri><abstract xml:lang="en"><p>A high serum vitamin B12 level (hypercobalaminemia) is a underestimated anomaly. Clinically, it can be paradoxically accompanied by signs of deficiency, which are related to defects in tissue uptake of vitamin B12. The increase in the level of serum cobalamin occurs mainly in serious diseases that require early diagnosis: hemoblastosis, liver and kidney diseases, etc. This review presents data on the metabolism of vitamin B12 and the potential significance of increasing its level as a marker for the early diagnosis of these diseases.</p></abstract><trans-abstract xml:lang="ru"><p>Гиперкобаламинемия - синдром повышения уровня витамина B12 в сыворотке крови, значение которого в клинической практике часто недооценивается. Это явление может сопровождаться парадоксальными с клинической точки зрения признаками гиповитаминоза витамина В12, отражающими наличие функционального дефицита, обусловленного дефектами потребления витамина тканями. Этиологическими факторами повышения уровня кобаламина в сыворотке крови являются преимущественно тяжелые заболевания, при которых особое значение для прогноза имеет ранняя диагностика: солидные опухоли, злокачественные гематологические новообразования, а также заболевания печени и почек с признаками их недостаточности. В настоящем обзоре представлены данные об обмене витамина В12 и потенциальной значимости повышения его уровня как маркера ранней диагностики этих заболеваний.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hypervitaminosis B12</kwd><kwd>hypercobalaminemia</kwd><kwd>hemoblastosis</kwd><kwd>liver diseases</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гипервитаминоз В12</kwd><kwd>гиперкобаламинемия</kwd><kwd>гемобластозы</kwd><kwd>заболевания печени</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Chiche L, Jean R, Romain F, Roux F, et al. 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