title: Radiosensitizing and cytocidal effects on hypoxic cells of RO-07-0582, and repair of x-ray injury, in an experimental mouse tumour.
abstract: The delay in regrowth to 10 mm diameter of a transplanted carcinoma in mice was used to estimate the effect of the hypoxic-cell radiosensitizer Ro-07-0582. When 1 mg/g body wt. was given before a single dose of X-rays, a dose-enhancement ratio of 2-0 was found. When the drug was given immediately after irradiation, a large cytotoxic effect was observed, equivalent to an enhancement ratio of 1-3. These results were confirmed by determining the X-ray doses required for the local control of 50% of the tumours at 80 days after irradiation. The capacity of the tumour for repair of sublethal X-ray injury within 24 h was similar to that for several normal tissues.
mesh_terms: D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000503:physiopathology / Q000532:radiotherapy*; D000860:Hypoxia; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000532:radiotherapy; D009593:Nitroimidazoles / Q000627:therapeutic use*; D011838:Radiation-Sensitizing Agents / Q000627:therapeutic use*; D012878:Skin Neoplasms / Q000503:physiopathology / Q000532:radiotherapy*; D014184:Transplantation, Homologous
chemical_list: D009593:Nitroimidazoles; D011838:Radiation-Sensitizing Agents