title: Evaluation of single-agent therapy in human colorectal tumour xenografts.
abstract: The response of 6 human colorectal tumour xenografts to 7 cytotoxic agents have been established. Tumour responses have been quantified by growth inhibition, and the time taken for 3H-thymidine fractional incorporation (TFI) to recover to the control value after treatment. The chemosensitivity of each tumour line to a spectrum of agents was individual, and no pattern of response which would allow prediction of individual agent efficacy was apparent. Cyclophosphamide, methyl-CCNU and 5-fluorouracil produced marked growth inhibition in individual tumour lines, whereas actinomycin-D, cis-dichlorodiammine platinum, doxorubicin and pentamethylmelamine showed little activity. Data presented agree with clinical evaluation for single-agent therapy. The uptake and incorporation of radiolabelled 5-fluorouracil into 4 tumour lines is reported. No marked differences between 3 FU-insensitive lines and 1 sensitive line have been observed.
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000627:therapeutic use; D003110:Colonic Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D005260:Female; D005472:Fluorouracil / Q000378:metabolism; D006801:Humans; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000188:drug therapy / Q000378:metabolism; D012004:Rectal Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D014183:Transplantation, Heterologous
chemical_list: D000970:Antineoplastic Agents; D005472:Fluorouracil