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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" article-type="research-article" dtd-version="1.1d1" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher">Applied Information Aspects of Medicine (Prikladnye informacionnye aspekty mediciny)</journal-id><journal-title-group><journal-title>Applied Information Aspects of Medicine (Prikladnye informacionnye aspekty mediciny)</journal-title></journal-title-group><issn publication-format="electronic">2070-9277</issn><publisher><publisher-name>Voronezh State Medical University named after N.N. Burdenko - The State Budgetary Institution of Higher Professional Education «Voronezh State Medical University named after N.N. Burdenko» of the Ministry of Public Health of the Russian</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">7856</article-id><article-id pub-id-type="doi">10.18499/2070-9277-2022-25-2-9-14</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>THE FLUORESCENT IMMUNOCYTOCHEMICAL TECHNOLOGY IN THE DIAGNOSTICS OF PRECANCERAL DISEASES AND CANCER OF THE ORAL MUCOSA</article-title></title-group><contrib-group><contrib contrib-type="author"><name name-style="western"><surname>Pursanova</surname><given-names>A. E.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Kazarina</surname><given-names>L. N.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Kruglova</surname><given-names>I. A.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Zinovev</surname><given-names>S. V.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Utkin</surname><given-names>O. V.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author"><name name-style="western"><surname>Kopylova</surname><given-names>O. V.</given-names></name><bio></bio><email>-</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff id="aff-1">National Research Ogarev Mordovia State University</aff><aff id="aff-2">Federal State Budgetary Educational Institution of Higher Education "Privolzhsky Research Medical University"</aff><aff id="aff-3">FBUN NNIIEM them. Academician I. N. Blokhina Rospotrebnadzor</aff><pub-date date-type="epub" iso-8601-date="2022-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2022</year></pub-date><volume>25</volume><issue>2</issue><fpage>9</fpage><lpage>14</lpage><history><pub-date date-type="received" iso-8601-date="2022-09-28"><day>28</day><month>09</month><year>2022</year></pub-date></history><permissions><copyright-statement>Copyright © 2022, Applied Information Aspects of Medicine (Prikladnye informacionnye aspekty mediciny)</copyright-statement><copyright-year>2022</copyright-year></permissions><abstract>The article examines the possibility of using fluorescent immunocytochemical research by direct immunofluorescence to improve the diagnosis and differential diagnosis of precancerous diseases and cancer of the oral mucosa by determining the expression of proteins Ki67, P16, P53, as well as the co-expression of Ki67/P16 in the epithelial cells of the SOR. Based on the examination of 108 people divided into 3 groups (group 1 - 38 patients with squamous cell carcinoma of the oral cavity, group 2 - 40 patients with precancerous pathology, and control group 3 - 30 people without pathology of the oral cavity), an algorithm was proposed for the diagnosis of precancerous diseases and cancer of the oral mucosa, including conducting at the primary clinical at the stage of morphological rapid diagnostics using fluorescent immunocytochemical studies.</abstract><kwd-group xml:lang="en"><kwd>Ki67</kwd><kwd>precancerous diseases</kwd><kwd>cancer</kwd><kwd>oral mucosa</kwd><kwd>diagnostics</kwd><kwd>fluorescent immunocytochemistry</kwd><kwd>Ki67</kwd><kwd>P53</kwd><kwd>P16</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>предраковые заболевания</kwd><kwd>рак</kwd><kwd>слизистая оболочка рта</kwd><kwd>диагностика</kwd><kwd>флуоресцентная иммуноцитохимия</kwd><kwd>Р53</kwd><kwd>Р16</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Вильданов М. 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