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Article title

Niedotlenienie guza jako czynnik predykcyjny w radioterapii onkologicznej

Title variants
Tumour hypoxia as a predictive factor for radiotherapy
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Radiotherapy is, next to surgery, the basic method of treatment in oncology. The intensive searching of the predictive factors for radiotherapy effectiveness, are still continuing. The mechanism of radiotherapy action depends on the cellular oxygen presence. The latest studies evidence, that the molecular oxygen, through the mechanism of fixation, leads to destruction of the DNA damage, caused by the ionizing radiation, repair. Number of studies has demonstrated, that the tumour hypoxia evaluation correlates with radiotherapy effectiveness. However, the universal method assessing the tumour hypoxia does not exist. Actually used methods, as Eppendorf’s electrode, the molecular markers of hypoxia evaluation, or PET studies with oxydo-reductive radiopharmaceutical agents, bring conflicting results. So, a lot of doubts about the quantitative and qualitative character of relationship between hypoxia and sensitivity for radiotherapy still exist. Moreover, the analysis is impeded by fact, that the hypoxia has significant negative prognostic influence on the treatment results with radiotherapy, through the genome and proteomic changes induction. The paper presents the actual status of knowledge about the influence of tumour hypoxia on radiotherapy effectiveness.
Radioterapia jest obok chirurgii podstawową metodą leczenia nowotworów. Trwają obecnie intensywne poszukiwania czynników predykcyjnych dla skuteczności radioterapii. Mechanizm działania radioterapii zależny jest od obecności tlenu w komórce. Najnowsze doświadczenia dowodzą, że tlen cząsteczkowy poprzez mechanizm fiksacji zaburza naprawę uszkodzeń wywołanych w DNA promieniowaniem jonizującym. Liczne badania wykazały, że ocena niedotlenienia guza koreluje z wynikiem radioterapii. Brak jednak uniwersalnej metody oceniającej hipoksję. Aktualnie stosowane metody, jak pomiar elektrodą Eppendorfa, ocena markerów molekularnych hipoksji czy badania PET z użyciem oksydoredukcyjnych radiofarmaceutyków dostarczają sprzecznych wyników. Istnieje więc wiele wątpliwości co do ilościowego i jakościowego charakteru zależności między niedotlenieniem a wrażliwością na radioterapię. Ponadto analizę utrudnia fakt, że niedotlenienie wywiera znaczny negatywny prognostyczny wpływ na wyniki leczenia radioterapią poprzez indukcję zmian genomowych i proteomicznych. W pracy przedstawiono aktualny stan wiedzy na temat wpływu niedotlenienia guza na skuteczność radioterapii.
Physical description
  • Zakład Radioterapii, Wielkopolskie Centrum Onkologii w Poznaniu
  • Oddział Radioterapii i Onkologii Ginekologicznej, Wielkopolskie Centrum Onkologii im. M. Skłodowskiej-Curie w Poznaniu. Kierownik: dr hab. n. med. A. Roszak. Wielkopolskie Centrum Onkologii, Oddział Radioterapii i Onkologii Ginekologicznej, ul. Garbary 15, 61-866 Poznań tel. 061 885 05 87, faks 061 852 19 48
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