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British Journal of Radiology (1982) 55, 42-47
© 1982 British Institute of Radiology
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The British Journal of Radiology, Vol 55, Issue 649 42-47, Copyright © 1982 by British Institute of Radiology

ARTICLES

Radioprotection of mouse skin by WR-2721 in single and fractionated treatments

FA Stewart and A Rojas

The radioprotective action of WR-2721 on mouse skin has been studied using single doses, two and five fractions. Significant radioprotection was observed with 200-500 mg/kg, in animals breathing air or oxygen at the time of irradiation. The degree of radioprotection increased with increasing dose, and was significantly greater in air than in oxygen, especially at low drug doses. Cumulative drug toxicity limited the fractionated treatments to lower drug doses, but the protection observed was similar to that seen with single doses at the same drug levels. The protection factors observed are lower than many published values for skin, and we conclude that a single protection factor cannot yet be stated for any dose of WR-2721. Local tissue oxygenation may account for some of the discrepancies in different studies.




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