TUMOR OXYGENATION AND RADIOSENSITIZATION BY PENTOXIFYLLINE AND A PERFLUBRON EMULSION CARBOGEN BREATHING
Oxygen tension measurements were made in three tumors: (i) the murine FSaII fibrosarcoma, (ii) the rat 9L gliosarcoma and (iii) the rat 13672 mammary adenocarcinoma using a pO2 histograph. Tumor oxygenation measurements were made while the animals breathed air or breathed carbogen (95% oxygen/5% carbon dioxide). Pentoxifylline or a perflubron emulsion was administered to the animals and tumor oxygen measurements were repeated under both breathing conditions. Both pentoxifylline and the perflubron emulsion improved the oxygenation of the FSaII fibrosarcoma under air breathing conditions but did not alter the oxygen profiles of either rat tumor compared with air breathing alone. Carbogen breathing increased the oxygenation of all tumors. Pentoxifylline administration did not change the oxygen profiles of the tumors under carbogen breathing conditions but administration of the perflubron emulsion increased the oxygenation of all three tumors under carbogen breathing conditions compared with carbogen breathing alone. Co-administration of pentoxifylline and the perflubron emulsion enhanced the radiation response of the Lewis lung tumor to daily fractionated radiation under air breathing conditions with a dose modifying factor of 1.65 and under carbogen breathing conditions with a dose modifying factor of 2.25. Over a range of perflubron emulsion doses, pentoxifylline increased the growth delay of the Lewis lung tumor in a constant manner. These results indicate that pentoxifylline and the perflubron emulsion have the largest impact on the oxygenation of more hypoxic tumors and that administration of the perflubron emulsion/carbogen breathing is the most effective means of increasing tumor oxygenation and radiation response.
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Document Type: Research Article
Publication date: January 1, 1993
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- The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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