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자료유형
학술저널
저자정보
저널정보
대한암학회 Cancer Research and Treatment Cancer Research and Treatment 제38권 제4호
발행연도
2006.1
수록면
229 - 233 (5page)

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Purpose: There is great recent interest in the potential value of using pentoxifylline (3,7-dimethyl-1(5-oxyhexyl)- xanthine, PTX) as an inhibitor of radiation-induced late normal tissue damage. The effects of PTX on the radiobiological parameters (α/β ratio, repair half time T1/2) of radiation myelopathy were studied in a rat model. Materials and Methods: Anesthetized Sprague-Dawley rats received irradiation to 2 cm of their cervical spines with using a 6MV LINAC (dose rate: 3 Gy/min). Radiation was administered in single, two, four and eight fractions with a fraction interval of 24 h with or without PTX. PTX was added to the rats’ distilled drinking water at a concentration of 2 g/L; the water was consumed ad libitum. After tabulation of the ED50 (the estimated dose needed to produce 50% paralysis in a group of irradiated animals), α/β could be estimated from the ratio of the slope to the intercept of the reciprocal-dose plot. Subsequently, the repair half time T1/2 was obtained from the data of the experimental group that received a pair of 7 Gy fractions on each day, separated by intervals of 4 and 8 h. Results: The α values calculated for RT alone and RT+PTX were almost the same. We noticed that the β value for the RT+PTX was lower than that for RT alone. So, the α/β ratio for the RT+PTX was higher. The T1/2 obtained from monoexponential model was 3.27 and 2.58 h for RT alone and RT+PTX, respectively. Conclusion: PTX increased the α/β ratio and it decreased the T1/2 of radiation myelopathy, suggesting that a decreasing fractionation sensitivity occurred. This implies that PTX, which distinctly acts upon the bending region of the high dose, may be expected to protect the spinal cord with a larger fraction size. (Cancer Res Treat. 2006;38:229-233)

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