Examination of Newly Synthesized 2-Chloroethyl-nitrosoureas on Rat Leukemia L 5222

Abstract
The preterminal i.p. implanted rat leukemia L-5222 was used to test the chemotherapeutic activity of 10 newly synthesized nitrosoureas: ethylmethanesulfonato-CNU [chloroethylnitrosourea], acetamido-CNU, dihydroxypropyl-CNU, carboxyethyl-CNU, cyanoethyl-CNU, morpholino-CNU, piperidino-CNU, methylene-dioxybenzyl-CNU, methylene-3-pyridyl-CNU and methylene-4-pyridyl-CNU; their activity was compared against BCNU, CCNU, MeCCNU and hydroxyethyl-CNU. All compounds tested showed chemotherapeutic activity. MeCCNU was superior to all other compounds investigated. The predictive value for human tumors, obtained from study of a model that is highly sensitive to nitrosoureas, is discussed.