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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Biotherapy</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Biotherapy</journal-title><trans-title-group xml:lang="ru"><trans-title>Российский биотерапевтический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1726-9784</issn><issn publication-format="electronic">1726-9792</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">1408</article-id><article-id pub-id-type="doi">10.17650/1726-9784-2023-22-3-75-86</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL REPORTS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Combined photodynamic and radiodynamic therapy with a chlorine photosensitizer under fractionated radiation exposure to transplanted tumors in an <italic>in vivo</italic> experiment</article-title><trans-title-group xml:lang="ru"><trans-title>Комбинированная фотодинамическая и радиодинамическая терапии с хлориновым фотосенсибилизатором при фракционированном лучевом воздействии на перевивные опухоли в эксперименте <italic>in vivo</italic></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7444-7997</contrib-id><name-alternatives><name xml:lang="en"><surname>Tzerkovsky</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Церковский</surname><given-names>Д. А.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>Lesnoy, Minsk region 223040</p></bio><bio xml:lang="ru"><p>223040 Минская область, Минский район, аг. Лесной</p></bio><email>tzerkovsky@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8165-7597</contrib-id><name-alternatives><name xml:lang="en"><surname>Mazurenko</surname><given-names>A. N.</given-names></name><name xml:lang="ru"><surname>Мазуренко</surname><given-names>А. Н.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>Lesnoy, Minsk region 223040</p></bio><bio xml:lang="ru"><p>223040 Минская область, Минский район, аг. Лесной</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9541-3374</contrib-id><name-alternatives><name xml:lang="en"><surname>Kozlovsky</surname><given-names>D. I.</given-names></name><name xml:lang="ru"><surname>Козловский</surname><given-names>Д. И.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>Lesnoy, Minsk region 223040</p></bio><bio xml:lang="ru"><p>223040 Минская область, Минский район, аг. Лесной</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0851-7317</contrib-id><name-alternatives><name xml:lang="en"><surname>Adamenko</surname><given-names>N. D.</given-names></name><name xml:lang="ru"><surname>Адаменко</surname><given-names>Н. Д.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>33 Moskovskiy ave., Vitebsk 210038</p></bio><bio xml:lang="ru"><p>210038 Витебск, пр-т Московский, 33</p></bio><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1028-4601</contrib-id><name-alternatives><name xml:lang="en"><surname>Borichevsky</surname><given-names>F. F.</given-names></name><name xml:lang="ru"><surname>Боричевский</surname><given-names>Ф. Ф.</given-names></name></name-alternatives><address><country country="BY">Belarus</country></address><bio xml:lang="en"><p>Lesnoy, Minsk region 223040</p></bio><bio xml:lang="ru"><p>223040 Минская область, Минский район, аг. Лесной</p></bio><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">N. N. Alexandrov National Cancer Center of Belarus</institution></aff><aff><institution xml:lang="ru">ГУ «Республиканский научно-практический центр онкологии и медицинской радиологии им. Н. Н. Александрова»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">P. M. Masherov Vitebsk State University</institution></aff><aff><institution xml:lang="ru">УО «Витебский государственный университет им. П. М. Машерова»</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Minsk Regional Clinical Hospital</institution></aff><aff><institution xml:lang="ru">Минская областная клиническая больница</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-10-18" publication-format="electronic"><day>18</day><month>10</month><year>2023</year></pub-date><volume>22</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>75</fpage><lpage>86</lpage><history><date date-type="received" iso-8601-date="2023-10-18"><day>18</day><month>10</month><year>2023</year></date><date date-type="accepted" iso-8601-date="2023-10-18"><day>18</day><month>10</month><year>2023</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://bioterapevt.abvpress.ru/jour/article/view/1408">https://bioterapevt.abvpress.ru/jour/article/view/1408</self-uri><abstract xml:lang="en"><p><bold>Introduction.</bold> The current direction of scientific research in experimental and clinical oncology is radiodynamic therapy (RDT), a treatment method based on the activation of photosensitizers (PS) by ionizing radiation. As the results of in vitro / in vivo studies show, a number of photosensitizing agents have radiomodifying properties, and the method itself is characterized by high antitumor efficacy.</p><p>Aim. To study the possibility of increasing the effectiveness of photodynamic therapy (PDT) through its combined use with RDT in an in vivo experiment.</p><p><bold>Materials and methods.</bold> The work was performed on 26 white non-linear rats weighing 180 ± 50 g. Pliss lymphosarcoma was used as a tumor model, which was transplanted subcutaneously. The chlorine-based PS (Belmedpreparaty, Republic of Belarus) was administered intravenously at a dose of 2.5 mg / kg of body weight. The RDT session was performed by the contact method (CRT) after 2.5–3, 24 and 48 hours after the end of PS administration on the microSelectron-HDR V3 Digital device (Elekta, Sweden) using γ-radiation (192Ir) in a single focal dose (SFD) of 2 Gy until the total focal dose of 6 Gy is reached. A PDT session was performed once immediately after the first exposure to ionizing radiation using a PDT diode laser (Imaf Axicon, Republic of Belarus, λ = 660 ± 5 nm) at an exposure dose of 100 J / cm² with a power density of 0.2 w / cm² and a power of 0.353 w. All rats were divided into 4 groups of 6–7 animals each: intact control, PS + PDT, PS + CRT, PS + CRT + PDT. The criteria for evaluating antitumor efficacy were: the average volume of tumors (Vav), the coefficient of absolute growth of tumors (K), the coefficient of tumor growth inhibition (TGI), the frequency of complete tumor regressions (CR), the proportion of cured rats, an increase in the average duration of dead rats. Differences were considered statistically significant at p &lt;0.05.</p><p><bold>Results.</bold> On the 18th day of the experiment, Vav in groups was 65.98 ± 0.81 cm³; 24.02 ± 4.01 cm³ (р &lt;0.00001); 17.11 ± 4.13 cm³ (р &lt;0.00001); 4.42 ± 1.65 cm³ (р &lt;0.00001), respectively. Coefficients K – 5497.33 OE; 1714.71 OE; 1424.83 OE; 367.33 OE. TGI coefficients – 63.60 % (PS + PDT); 74.07 % (PS + CRT); 93.30 % (PS + CRT + PDT). An in crease in the average duration of dead rats indicator – 25.31 % (PS + PDT); 55.06 % (PS + CRT); 158.22 % (PS + CRT + PDT). On the 60th and 90th days of the experiment, the frequency of CR and the proportion of cured rats were the same and amounted to 0; 16.7; 14.3 and 42.9 %, respectively.</p><p><bold>Conclusion.</bold> The results obtained indicate that the chlorine PS has, in addition to photosensitizing properties, also radiomodifying properties, and the developed method of combined therapy is characterized by high antitumor efficacy.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Введение.</bold> Актуальным направлением научных исследований в экспериментальной и клинической онкологии является радиодинамическая терапия (РДТ) – метод лечения, основанный на активации фотосенсибилизаторов (фС) ионизирующим излучением. Как показывают результаты <italic>in vitro / in vivo</italic> исследований, ряд фотосенсибилизирующих агентов обладают радиомодифицирующими свойствами, а сам метод характеризуется высокой противоопухолевой эффективностью.</p><p><bold>Цель исследования</bold> – изучить возможность повышения эффективности фотодинамической терапии (фДТ) за счет ее комбинированного применения с РДТ в эксперименте <italic>in vivo.</italic></p><p><bold>Материалы и методы.</bold> Работа выполнена на 26 белых нелинейных крысах с массой тела 180 ± 50 г. В качестве опухолевой модели использовали лимфосаркому Плисса (ЛСП), которую перевивали подкожно. фС, представляющий собой тринатриевую соль хлорина е6 («Белмедпрепараты», Беларусь), вводился внутривенно в дозе 2,5 мг / кг массы тела. Сеанс РДТ проводили через 2,5–3,0, 24 и 48 ч после окончания инфузии фС контактным методом (КЛТ) на аппарате microSelectron-HDR V3 Digital (Elekta, Швеция) с использованием γ-излучения (192Ir) в разовой очаговой дозе (РОД) 2 Гр до достижения суммарной очаговой дозы (СОД) 6 Гр. Сеанс фДТ осуществляли однократно непосредственно после первого воздействия ионизирующим излучением с помощью полупроводникового лазера PDT diode laser (Imaf Axicon, Беларусь, λ = 660 ± 5 нм) в экспозиционной дозе 100 Дж / см2 с плотностью мощности 0,2 Вт / см2 и мощностью 0,353 Вт. Все крысы были разделены на 4 группы по 6–7 особей в каждой: интактный контроль, фС + фДТ, фС + КЛТ, фС + КЛТ + фДТ. Критериями оценки противоопухолевой эффективности были: средний объем опухолей (Vср), коэффициент абсолютного прироста опухолей (К), коэффициент торможения роста опухолей (ТРО), частота полных опухолевых регрессий (ПР), доля излеченных крыс, показатель увеличения средней продолжительности жизни (УПЖ) павших крыс. Различия считались статистически значимыми при уровне значимости p &lt;0,05.</p><p><bold>Результаты.</bold> На 18-е сутки эксперимента Vср в группах составил 65,98 ± 0,81 см³; 24,02 ± 4,01 см³ (р &lt;0,00001); 17,11 ± 4,13 см³ (р &lt;0,00001); 4,42 ± 1,65 см³ (р &lt;0,00001) соответственно. Коэффициенты К – 5497,33 ОЕ, 1714,71 ОЕ, 1424,83 ОЕ, 367,33 ОЕ. Коэффициенты ТРО – 63,60 % (фС + фДТ); 74,07 % (фС + КЛТ); 93,30 % (фС + КЛТ + фДТ). Показатель УПЖ – 25,31 % (фС + фДТ); 55,06 % (фС + КЛТ); 158,22 % (фС + КЛТ + фДТ). На 60-е и 90-е сутки эксперимента частота ПР и доля излеченных крыс были одинаковыми и составили в группах 0; 16,7; 14,3 и 42,9 % соответственно.</p><p><bold>Выводы.</bold> Полученные результаты свидетельствуют о наличии у хлоринового фС помимо фотосенсибилизирующих свойств также и радиомодифицирующих, а разработанный метод комбинированной терапии характеризуется высокой противоопухолевой эффективностью.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rats</kwd><kwd>transplanted tumors</kwd><kwd>photodynamic therapy</kwd><kwd>radiodynamic therapy</kwd><kwd>photosensitizer</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>крысы</kwd><kwd>перевивные опухоли</kwd><kwd>фотодинамическая терапия</kwd><kwd>радиодинамическая терапия</kwd><kwd>фотосенсибилизатор</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported financially by the National Academy of Sciences of Belarus (grant № 2021-61-284, 2021–2022).</funding-statement><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Национальной академии наук Беларуси (грант № 2021-61-284, 2021–2022 гг.).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">1. 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