title: Formulation and biological distribution of radiolabeled 1-(2-chloroethyl)-3-cyclohexyl-1-nitrosourea in an animal tumor model.
abstract: A formulation of 1-[2-chloroethyl-U-14C]-3-cyclohexyl-1-nitrosourea in ethanol:propylene glycol (1:4, v/v) was administered to rats previously infiltrated with RT6 glioma tumors (astrocytic series); the organ and tumor tissue distribution was followed at 1, 4, 12, and 24 hr postinjection. From 0 to 1 hr, rapid blood disappearance of the 1-[2-chloroethyl-U-14C]-3-cyclohexyl-1-nitrosourea was observed with a concomitant increase in all organs except the lung, muscle, and brain. After 24 hr, only the blood, liver, and muscle contained < 1% of the dose. Throughout the study, the bladder, liver, small intestine and kidneys concentrated the highest percentages on a per-gram basis. The distribution of 1-[2-chloroethyl-U-14C]-3-cyclohexyl-1-nitrosourea in the tumor relative to brain, blood, and muscle showed a maximum 4 to 12 hr after administration.
mesh_terms: D000818:Animals; D001254:Astrocytoma / Q000378:metabolism*; D007275:Injections, Intravenous; D008130:Lomustine / Q000378:metabolism / Q000494:pharmacology*; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000378:metabolism; D009607:Nitrosourea Compounds / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors; D014018:Tissue Distribution
chemical_list: D009607:Nitrosourea Compounds; D008130:Lomustine