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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">oncotomsk</journal-id><journal-title-group><journal-title xml:lang="ru">Сибирский онкологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Siberian journal of oncology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1814-4861</issn><issn pub-type="epub">2312-3168</issn><publisher><publisher-name>Tomsk National Research Medical Сепtеr of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21294/1814-4861-2018-17-5-60-66</article-id><article-id custom-type="elpub" pub-id-type="custom">oncotomsk-859</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>ЛАБОРАТОРНЫЕ И ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>LABORATORY AND EXPERIMENTAL STUDIES</subject></subj-group></article-categories><title-group><article-title>РАКОВО-ЭМБРИОНАЛЬНЫЙ АНТИГЕН ДО И ПОСЛЕ НЕОАДЪЮВАНТНОЙ ХИМИОЛУЧЕВОЙ ТЕРАПИИ В ПРЕДСКАЗАНИИ ПОЛНОГО МОРФОЛОГИЧЕСКОГО ОТВЕТА У БОЛЬНЫХ МЕСТНОРАСПРОСТРАНЕННЫМ РАКОМ ПРЯМОЙ КИШКИ</article-title><trans-title-group xml:lang="en"><trans-title>Carcinoembryonic antigen BEFORE AND AFTER neoadjuvant chemoradiotherapy IN PREDICTION OF pathological complete response in patients with locally advanced rectal cancer</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Северская</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Severskaya</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Северская Наталья Викторовна, кандидат медицинских наук, заведующая отделением «ин витро» радионуклидной диагностики, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p>SPIN-код: 3999-8816. Author ID: 133049</p></bio><bio xml:lang="en"><p>Natalya V. Severskaya, MD, PhD, Head of the Department of Nuclear Medicine In Vitro, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">severskn@mrrc.obninsk.ru</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>Ерыгин</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Erygin</surname><given-names>D. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ерыгин Дмитрий Валерьевич, кандидат медицинских наук, ведущий научный сотрудник отделения лучевого и хирургического лечения заболеваний абдоминальной области, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p>SPIN-код: 3155-6227. Author ID: 149347</p></bio><bio xml:lang="en"><p>Dmitriy V. Erygin, MD, PhD, Leading Researcher, Department of Radiation and Surgical Treatment of Abdominal Diseases, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">erigind@mail.ru</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>Александров</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Aleksandrov</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Александров Юрий Владимирович, стажер отделения «ин витро» радионуклидной диагностики, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p> </p></bio><bio xml:lang="en"><p>Yuri V. Alexandrov, intern, Department of Nuclear Medicine In Vitro, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">roman.9920@yandex.ru</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>Минаева</surname><given-names>Н. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Minaeva</surname><given-names>N. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минаева Наталья Георгиевна, кандидат биологических наук, старший научный сотрудник отделения «ин витро» радионуклидной диагностики, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p>SPIN-код: 5557-4671. Author ID: 798915</p></bio><bio xml:lang="en"><p>Natalia G. Minaeva, PhD, Senior Researcher, Department of Nuclear Medicine In Vitro, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">minaeva65@mail.ru</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>Двинских</surname><given-names>Н. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Dvinskikh</surname><given-names>N. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Двинских Нина Юрьевна, кандидат медицинских наук, заведующая патолого-анатомическим отделением, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p>Author ID: 149539</p></bio><bio xml:lang="en"><p>Nina Yu. Dvinskikh, MD, PhD, Head of Pathology and Anatomy Department, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">dvinskih.patology@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>Новиков</surname><given-names>Н. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Novikov</surname><given-names>N. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Новиков Николай Юльевич, доктор медицинских наук, старший научный сотрудник патолого-анатомического отделения, Медицинский радиологический научный центр имени А.Ф. Цыба – филиал</p><p>249036, г. Обнинск, ул. Королева, 4</p><p>SPIN-код: 3712-1584. Author ID: 681538</p></bio><bio xml:lang="en"><p>Nikolay Yu. Novikov, MD, PhD, Senior Researcher, Pathology and Anatomy Department, A. Tsyb Medical Radiological Research Center – branch</p><p>4, Korolev Street, Obninsk-249036</p></bio><email xlink:type="simple">tttravelll@yandex.ua</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУ «Национальный медицинский исследовательский центр радиологии» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Radiological Center of the Ministry of Health of the Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>01</day><month>11</month><year>2018</year></pub-date><volume>17</volume><issue>5</issue><fpage>60</fpage><lpage>66</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Северская Н.В., Ерыгин Д.В., Александров Ю.В., Минаева Н.Г., Двинских Н.Ю., Новиков Н.Ю., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Северская Н.В., Ерыгин Д.В., Александров Ю.В., Минаева Н.Г., Двинских Н.Ю., Новиков Н.Ю.</copyright-holder><copyright-holder xml:lang="en">Severskaya N.V., Erygin D.V., Aleksandrov Y.V., Minaeva N.G., Dvinskikh N.Y., Novikov N.Y.</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.siboncoj.ru/jour/article/view/859">https://www.siboncoj.ru/jour/article/view/859</self-uri><abstract><p>Раково-эмбриональный антиген (РЭА) используется для оценки эффективности проведенного лечения у больных раком прямой кишки.</p><p>Цель исследования – оценить возможность предсказания полного морфологического ответа после неоадъювантной химиолучевой терапии (нХЛТ) у больных местнораспространенным раком прямой кишки по уровню РЭА до и после лечения.</p><sec><title>Материал и методы</title><p>Материал и методы. В исследование включено 179 больных местнораспространенным раком прямой кишки (РПК), получавших нХЛТ с последующим хирургическим лечением. Исследовали уровень РЭА в сыворотке крови до начала и через 6–10 нед после завершения нХЛТ. Результаты РЭА до и после нХЛТ сопоставлены со степенью патоморфоза, определяемого после операции. Проведен анализ факторов, влияющих на достижение полного морфологического ответа (ПМО).</p></sec><sec><title>Результаты</title><p>Результаты. ПМО после нХЛТ получен у 12 % (22/179) больных. Частота ПМО была выше у больных с исходно нормальным (&lt;5 нг/мл) РЭА (20 % vs 8 %, р=0,019). Не выявлено значимых различий в частоте ПМО у больных с исходно повышенным (&gt;5 нг/мл) РЭА в случае его нормализации после лечения и без нормализации (р=0,08). Максимальная вероятность ПМО, определенная по ROC кривой, при исходном РЭА &lt;2,8 нг/мл (31 %) и РЭА после лечения &lt;1,8 нг/мл (23 %). Высокая степень дифференцировки опухоли (G1) повышала вероятность ПМО у больных с низким исходным РЭА (&lt;2,8 нг/мл) до 46 %.</p></sec><sec><title>Выводы</title><p>Выводы. Низкий уровень РЭА до и после лечения является предиктором ПМО. Высокая степень дифференцировки при низком уровне РЭА повышает вероятность ПМО после нХЛТ.</p></sec></abstract><trans-abstract xml:lang="en"><p>Carcinoembryonic antigen (CEA) is widely used to evaluate the effectiveness of treatment in patients with rectal cancer.</p><p>The aim of the study was to investigate whether the CEA levels measured before and after neoadjuvant chemoradiotherapy (nCRT) can be used to predict pathological complete response (pCR) in patients with locally advanced rectal cancer.</p><sec><title>Material and methods</title><p>Material and methods. 179 patients with locally advanced rectal cancer were treated with nCRT followed by surgical treatment. The serum CEA level was measured before and 610 weeks after the completion of nCRT. Preand post nCRT CEA levels were compared with pCR. The factors associated with pCR were studied.</p></sec><sec><title>Results</title><p>Results. pCR after nCRT was achieved in 12 % (22/179) patients. The incidence of pCR was higher in patients with normal (&lt;5 ng/mL) pre-treatment CEA level (20 % vs 8 %, p=0.019). In patients with the elevated pre-treatment CEA level (&gt; 5 ng/mL), there were no significant differences in the incidence of pCR between cases with normalization and without normalization of CEA level after treatment (p=0.08). The maximum likelihood of pCR determined by the ROC curve was &lt;2.8 ng/mL with pre-treatment CEA (31 %) and &lt;1.8 ng/mL with post-treatment CEA (23 %). Well differentiated tumors (G1) had higher likelihood of pCR (46%) in patients with low pre-treatment CEA (&lt;2.8 ng/mL).</p></sec><sec><title>Conclusion</title><p>Conclusion. Low CEA before and after nCRT is a predictor of pCR. Well differentiated tumors increase the probability of pCR after nCRT.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>рак прямой кишки</kwd><kwd>РЭА</kwd><kwd>патоморфоз</kwd><kwd>полный морфологический ответ</kwd><kwd>неоадъювантная химиолучевая терапия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rectal cancer</kwd><kwd>CEA</kwd><kwd>tumor regression grade</kwd><kwd>pathological complete response</kwd><kwd>neo-adjuvant chemoradiotherapy</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">Torre L.A., Bray F., Siegel R.L., Ferlay J., Lortet-Tieulent J., Jemal A. Global Cancer Statistics 2012. CA Cancer J Clin. 2015 Mar; 65 (2): 87–108. doi: 10.3322/caac.21262.</mixed-citation><mixed-citation xml:lang="en">Torre L.A., Bray F., Siegel R.L., Ferlay J., Lortet-Tieulent J., Jemal A. Global Cancer Statistics 2012. CA Cancer J Clin. 2015 Mar; 65 (2): 87–108. doi: 10.3322/caac.21262.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Каприн А.Д., Старинский В.В., Петрова Г.В. Состояние онкологической помощи населению России в 2016 году. М., 2017. 236.</mixed-citation><mixed-citation xml:lang="en">Kaprin A.D., Starinsky V.V., Petrova G.V. The state of cancer care to the population of Russia in 2016. Moscow, 2017. 236. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Sauer R., Liersch T., Merkel S., Fietkau R., Hohenberger W., Hess C., Becker H., Raab H.R., Villanueva M.T., Witzigmann H., Wittekind C., Beissbarth T., Rödel C. Preoperative versus postoperative chemoradiotherapy for locally advanced rectal cancer: results of the German CAO/ARO/AIO-94 randomized phase III trial after a median follow-up of 11 years. J Clin Oncol. 2012 Jun 1; 30 (16): 1926–33. doi: 10.1200/JCO.2011.40.1836.</mixed-citation><mixed-citation xml:lang="en">Sauer R., Liersch T., Merkel S., Fietkau R., Hohenberger W., Hess C., Becker H., Raab H.R., Villanueva M.T., Witzigmann H., Wittekind C., Beissbarth T., Rödel C. Preoperative versus postoperative chemoradiotherapy for locally advanced rectal cancer: results of the German CAO/ARO/AIO-94 randomized phase III trial after a median follow-up of 11 years. J Clin Oncol. 2012 Jun 1; 30 (16): 1926–33. doi: 10.1200/JCO.2011.40.1836.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Monson J.R., Weiser M.R., Buie W.D., Chang G.J., Rafferty J.F., Buie W.D., Rafferty J.; Standards Practice Task Force of the American Society of Colon and Rectal Surgeons. Standards Practice Task Force of the American Society of Colon and Rectal Surgeons. Practice parameters for the management of rectal cancer (revised). Dis Colon Rectum. 2013 May; 56 (5): 535–50. doi: 10.1097/DCR.0b013e31828cb66c.</mixed-citation><mixed-citation xml:lang="en">Monson J.R., Weiser M.R., Buie W.D., Chang G.J., Rafferty J.F., Buie W.D., Rafferty J.; Standards Practice Task Force of the American Society of Colon and Rectal Surgeons. Standards Practice Task Force of the American Society of Colon and Rectal Surgeons. Practice parameters for the management of rectal cancer (revised). Dis Colon Rectum. 2013 May; 56 (5): 535–50. doi: 10.1097/DCR.0b013e31828cb66c.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Wallin U., Rothenberger D., Lowry A., Luepker R., Mellgren A. CEA a predictor for pathologic complete response after neoadjuvant therapy for rectal cancer. Dis Colon Rectum. 2013 Jul; 56 (7): 859–68. doi: 10.1097/DCR.0b013e31828e5a72.</mixed-citation><mixed-citation xml:lang="en">Wallin U., Rothenberger D., Lowry A., Luepker R., Mellgren A. CEA a predictor for pathologic complete response after neoadjuvant therapy for rectal cancer. Dis Colon Rectum. 2013 Jul; 56 (7): 859–68. doi: 10.1097/DCR.0b013e31828e5a72.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Colloca G., Venturino A., Vitucci P. Pre-treatment carcinoembryonic antigen and outcome of patients with rectal cancer receiving neo-adjuvant chemo-radiation and surgical resection: a systematic review and meta-analysis. Med Oncol. 2017 Sep 7; 34 (10): 177. doi: 10.1007/s12032-017-1037-8.</mixed-citation><mixed-citation xml:lang="en">Colloca G., Venturino A., Vitucci P. Pre-treatment carcinoembryonic antigen and outcome of patients with rectal cancer receiving neo-adjuvant chemo-radiation and surgical resection: a systematic review and meta-analysis. Med Oncol. 2017 Sep 7; 34 (10): 177. doi: 10.1007/s12032-017-1037-8.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Yu C.S., Yun H.R., Shin E.J., Lee K.Y., Kim N.K., Lim S.B., Oh S.T., Kang S.B., Choi W.J., Lee W.Y.; Colorectal Cancer Study Group, Korean Society of Coloproctology. Local excision after neoadjuvant chemoradiation therapy in advanced rectal cancer: a national multicenter analysis. Am J Surg. 2013 Oct; 206 (4): 482–7. doi: 10.1016/j.amjsurg.2013.01.042.</mixed-citation><mixed-citation xml:lang="en">Yu C.S., Yun H.R., Shin E.J., Lee K.Y., Kim N.K., Lim S.B., Oh S.T., Kang S.B., Choi W.J., Lee W.Y.; Colorectal Cancer Study Group, Korean Society of Coloproctology. Local excision after neoadjuvant chemoradiation therapy in advanced rectal cancer: a national multicenter analysis. Am J Surg. 2013 Oct; 206 (4): 482–7. doi: 10.1016/j.amjsurg.2013.01.042.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Habr-Gama A., Sabbaga J., Gama-Rodrigues J., São Julião G.P., Proscurshim I., Bailão Aguilar P., Nadalin W., Perez R.O. Watch and wait approach following extended neoadjuvant chemoradiation for distal rectal cancer: are we getting closer to anal cancer management? Dis Colon Rectum. 2013 Oct; 56 (10): 1109–17. doi:10.1097/DCR.0b013e3182a25c4e.</mixed-citation><mixed-citation xml:lang="en">Habr-Gama A., Sabbaga J., Gama-Rodrigues J., São Julião G.P., Proscurshim I., Bailão Aguilar P., Nadalin W., Perez R.O. Watch and wait approach following extended neoadjuvant chemoradiation for distal rectal cancer: are we getting closer to anal cancer management? Dis Colon Rectum. 2013 Oct; 56 (10): 1109–17. doi:10.1097/DCR.0b013e3182a25c4e.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Maas M., Beets-Tan R.G., Lambregts D.M., Lammering G., Nelemans P.J., Engelen S.M., van Dam R.M., Jansen R.L., Sosef M., Leijtens J.W., Hulsewé K.W., Buijsen J., Beets G.L. Wait-and-see policy for clinical complete responders after chemoradiation for rectal cancer. J Clin Oncol. 2011 Dec 10; 29 (35): 4633–40. doi: 10.1200/JCO.2011.37.7176.</mixed-citation><mixed-citation xml:lang="en">Maas M., Beets-Tan R.G., Lambregts D.M., Lammering G., Nelemans P.J., Engelen S.M., van Dam R.M., Jansen R.L., Sosef M., Leijtens J.W., Hulsewé K.W., Buijsen J., Beets G.L. Wait-and-see policy for clinical complete responders after chemoradiation for rectal cancer. J Clin Oncol. 2011 Dec 10; 29 (35): 4633–40. doi: 10.1200/JCO.2011.37.7176.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Peng J., Lin J., Qiu M., Wu X., Lu Z., Chen G., Li L., Ding P., Gao Y., Zeng Z., Zhang H., Wan D., Pan Z. Clinical factors of post-chemoradiotherapy as valuable indicators for pathological complete response in locally advanced rectal cancer. Clinics (Sao Paulo). 2016 Aug; 71 (8): 449–54. doi: 10.6061/clinics/2016(08)07.</mixed-citation><mixed-citation xml:lang="en">Peng J., Lin J., Qiu M., Wu X., Lu Z., Chen G., Li L., Ding P., Gao Y., Zeng Z., Zhang H., Wan D., Pan Z. Clinical factors of post-chemoradiotherapy as valuable indicators for pathological complete response in locally advanced rectal cancer. Clinics (Sao Paulo). 2016 Aug; 71 (8): 449–54. doi: 10.6061/clinics/2016(08)07.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Kleiman A., A-Khamis A., Farsi A., Kezouh A., Vuong T., Gordon P.H., Vasilevsky C.A., Morin N., Faria J., Ghitulescu G., Boutros M. Normalization of CEA levels post-neoadjuvant therapy is a strong predictor of pathologic complete response in rectal cancer. J Gastrointest Surg. 2015 Jun; 19 (6): 1106–12. doi: 10.1007/s11605-015-2814-3.</mixed-citation><mixed-citation xml:lang="en">Kleiman A., A-Khamis A., Farsi A., Kezouh A., Vuong T., Gordon P.H., Vasilevsky C.A., Morin N., Faria J., Ghitulescu G., Boutros M. Normalization of CEA levels post-neoadjuvant therapy is a strong predictor of pathologic complete response in rectal cancer. J Gastrointest Surg. 2015 Jun; 19 (6): 1106–12. doi: 10.1007/s11605-015-2814-3.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Yang K.L., Yang S.H., Liang W.Y., Kuo Y.J., Lin J.K., Lin T.C., Chen W.S., Jiang J.K., Wang H.S., Chang S.C., Chu L.S., Wang L.W. Carcinoembryonic antigen (CEA) level, CEA ratio, and treatment outcome of rectal cancer patients receiving pre-operative chemoradiation and surgery. Radiat Oncol. 2013 Mar 1; 8: 43. doi: 10.1186/1748-717X-8-43.</mixed-citation><mixed-citation xml:lang="en">Yang K.L., Yang S.H., Liang W.Y., Kuo Y.J., Lin J.K., Lin T.C., Chen W.S., Jiang J.K., Wang H.S., Chang S.C., Chu L.S., Wang L.W. Carcinoembryonic antigen (CEA) level, CEA ratio, and treatment outcome of rectal cancer patients receiving pre-operative chemoradiation and surgery. Radiat Oncol. 2013 Mar 1; 8: 43. doi: 10.1186/1748-717X-8-43.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Garland M.L., Vather R., Bunkley N., Pearse M., Bissett I.P. Clinical tumour size and nodal status predict pathologic complete response following neoadjuvant chemoradiotherapy for rectal cancer. Int J Colorectal Dis. 2014 Mar; 29 (3): 301–7. doi: 10.1007/s00384-013-1821-7.</mixed-citation><mixed-citation xml:lang="en">Garland M.L., Vather R., Bunkley N., Pearse M., Bissett I.P. Clinical tumour size and nodal status predict pathologic complete response following neoadjuvant chemoradiotherapy for rectal cancer. Int J Colorectal Dis. 2014 Mar; 29 (3): 301–7. doi: 10.1007/s00384-013-1821-7.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Lou Z., Meng R.G., Zhang W., Yu E.D., Fu C.G. Preoperative carcinoembryonic antibody is predictive of distant metastasis in pathologically T1 colorectal cancer after radical surgery. World J Gastroenterol. 2013 Jan 21; 19 (3): 389–93. doi: 10.3748/wjg.v19.i3.389.</mixed-citation><mixed-citation xml:lang="en">Lou Z., Meng R.G., Zhang W., Yu E.D., Fu C.G. Preoperative carcinoembryonic antibody is predictive of distant metastasis in pathologically T1 colorectal cancer after radical surgery. World J Gastroenterol. 2013 Jan 21; 19 (3): 389–93. doi: 10.3748/wjg.v19.i3.389.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Huh J.W., Kim H.R., Kim Y.J. Clinical prediction of pathological complete response after preoperative chemoradiotherapy for rectal cancer. Dis Colon Rectum. 2013 Jun; 56 (6): 698–703. doi: 10.1097/ DCR.0b013e3182837e5b.</mixed-citation><mixed-citation xml:lang="en">Huh J.W., Kim H.R., Kim Y.J. Clinical prediction of pathological complete response after preoperative chemoradiotherapy for rectal cancer. Dis Colon Rectum. 2013 Jun; 56 (6): 698–703. doi: 10.1097/ DCR.0b013e3182837e5b.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Saito G., Sadahiro S., Ogimi T., Miyakita H., Okada K., Tanaka A., Suzuki T. Relations of Changes in Serum Carcinoembryonic Antigen Levels before and after Neoadjuvant Chemoradiotherapy and after Surgery to Histologic Response and Outcomes in Patients with Locally Advanced Rectal Cancer. Oncology. 2018 Dec 22; 94 (3): 167–175. doi: 10.1159/000485511.</mixed-citation><mixed-citation xml:lang="en">Saito G., Sadahiro S., Ogimi T., Miyakita H., Okada K., Tanaka A., Suzuki T. Relations of Changes in Serum Carcinoembryonic Antigen Levels before and after Neoadjuvant Chemoradiotherapy and after Surgery to Histologic Response and Outcomes in Patients with Locally Advanced Rectal Cancer. Oncology. 2018 Dec 22; 94 (3): 167–175. doi: 10.1159/000485511.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Каприн А.Д., Галкин В.Н., Жаворонков Л.П., Иванов В.К., Иванов С.А., Романко Ю.С. Синтез фундаментальных и прикладных исследований – основа обеспечения высокого уровня научных результатов и внедрения их в медицинскую практику. Радиация и риск. 2017; 26 (2): 26–40.</mixed-citation><mixed-citation xml:lang="en">Kaprin A.D., Galkin V.N., Zhavoronkov L.P., Ivanov V.K., Ivanov S.A., Romanko Yu.S. Synthesis of fundamental and applied research is the basis for ensuring a high level of scientific results and their introduction into medical practice. Radiation and Risk. 2017; 26 (2): 26–40. (in Russian).</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
