Use of Druckrey analysis to quantitatively evaluate the chemopreventive efficacy of N-difluoromethylornithine (DFMO), a prototype proliferation inhibitor.
Druckrey analysis of the results of skin painting TG.AC transgenic mice with three different doses of benzo[a]pyrene was used to obtain quantitative estimates of the in vivo cancer chemopreventive efficacy of N-difluoromethylornithine. The percent decrease in mean rate of subvisible tumor development during the tumor latent period produced by 2000 ppm and 4000 ppm DFMO in the diet was 39% and 50%, respectively. Druckrey analysis was also successfully applied to transformations of published data on human cigarette smokers. The time before onset of lung cancer in 2% of smokers was prolonged 17 weeks for every cigarette per day not smoked. The Druckrey model, of substantiated validity because of the results in human smokers, provides a rapid quantitative screening method applicable to large numbers of candidate chemopreventive agents.
Chemoprevention Branch, DCPC, National Cancer Institute, Bethesda, MD 20894, USA.
C W
CW
Boone
V E
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Steele
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D
Gaylor
G J
GJ
Kelloff
D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects*; D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D000518:Eflornithine / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology; D051379:Mice; D008822:Mice, Transgenic; D012907:Smoking / Q000473:pathology
D016588:Anticarcinogenic Agents; D000518:Eflornithine