title: Radiation therapy and Corynebacterium parvum in the treatment of murine tumors.
abstract: The relative effectiveness of local irradiation alone or combined with Corynebacterium parvum (C parvum) treatment has been investigated employing four tumors: a mammary carcinoma (MCa) (nonimmunogenic), a fibrosarcoma (moderately strongly immunogenic), and two squamous cell carcinomas (SCC-2 being weakly and SCC-4 being very weakly or nonimmunogenic). C parvum treatment was started when the isotransplanted tumor growing in the mouse leg was 5 mm in diameter and the local irradiation was administered to 8-mm diameter tumor. Effect of the combined treatment was barely evident with the MCa but strongly present in FSa; up to 60% of mice were cured of FSa by C parvum alone and the response to low radiation dose, e.g., 200 rads, was highly increased. For SCC-2 the TCD50 was approximately 7000 rads and 3000 rads in control and test mice, respectively. Comparable values for SCC-4 were 7700 and approximately 5500 rads. Importantly, for SCC-4 there was a large and highly significant reduction in the proportion of mice that died of metastases to lung but were free of evident tumor at the primary site.
mesh_terms: D000818:Animals; D002294:Carcinoma, Squamous Cell / Q000276:immunology / Q000532:radiotherapy; D004307:Dose-Response Relationship, Radiation; D005260:Female; D005354:Fibrosarcoma / Q000276:immunology / Q000532:radiotherapy / Q000628:therapy*; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000276:immunology / Q000532:radiotherapy / Q000628:therapy*; D051379:Mice; D008809:Mice, Inbred C3H; D009362:Neoplasm Metastasis; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental; D011425:Propionibacterium acnes / Q000276:immunology*; D014185:Transplantation, Isogeneic