title: Potentiation of the chemotherapeutic effect of 5-fluorouracil by combination with guanosine 5'-monophosphate.
abstract: The chemotherapeutic effect of the 5-fluorouracil (5-FU)-guanosine 5'-monophosphate (GMP) combination in various mouse tumor systems was compared with that of 5-FU monotherapy. Antitumor activity of 5-FU against L-1210 leukemia was potentiated without increasing its toxicity to the host when GMP at 30-100 mg/kg/day was injected simultaneously with 5-FU. Any time interval between the administrations of 5-FU and GMP diminished the increase in survival. Moreover, the combination of 5-FU and GMP at 100 mg/kg/day produced marked antitumor effects in the P-388 leukemia, ascites sarcoma 180, and Ehrlich ascites carcinoma systems. GMP also potentiated the antitumor activity of 5-FU in solid tumor systems (adenocarcinoma 755 and Lewis lung carcinoma) when given by intravenous injection, but not intraperitoneal injection. The therapeutic effect of 5-FU on various murine tumors was markedly potentiated by GMP at 100 mg/kg/day or less without increasing the toxicity to the host.
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy; D000818:Animals; D004359:Drug Therapy, Combination; D005472:Fluorouracil / Q000008:administration & dosage*; D006150:Guanine Nucleotides / Q000008:administration & dosage*; D006157:Guanosine Monophosphate / Q000008:administration & dosage*; D007939:Leukemia L1210 / Q000188:drug therapy; D007941:Leukemia P388 / Q000188:drug therapy; D008175:Lung Neoplasms / Q000188:drug therapy; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009374:Neoplasms, Experimental / Q000188:drug therapy*; D013997:Time Factors
chemical_list: D006150:Guanine Nucleotides; D006157:Guanosine Monophosphate; D005472:Fluorouracil