NCIt definition : An inhalant consisting of hyperoxic gas (95%-98% oxygen and 2%-5% carbon dioxide)
with radiosensitizing properties. Inhaled carbogen reduces diffusion-limited tumor
hypoxia, increasing tumor radiosensitivity due to the increased availability of molecular
oxygen for cytotoxic radiation-induced oxygen free radical production. (NCI04);
Alternative definition : NCI-GLOSS: An inhalant of oxygen and carbon dioxide that increases the sensitivity
of tumor cells to the effects of radiation therapy.;