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Lubet RA , Clapper ML , McCormick DL , Pereira MA , Chang WCL , Steele VE , Fischer SM , Juliana MM , Grubbs CJ
Chemopreventive efficacy of Targretin in rodent models of urinary bladder, colon/intestine, head and neck and mammary cancers
Oncology Reports. 2012 May;27(5) :1400-1406
PMID: WOS:000302202600016   
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The chemopreventive efficacy of Targretin was evaluated in various rodent cancer models. In the rat model of 4-hydroxybutyl(butyl)nitrosamine (OH-BBN)-induced urinary bladder cancer, it was found that Targretin administered in the diet (beginning one week after the last OH-BBN treatment) for 5.5 months increased the number and size of urinary bladder cancers. In the azoxymethane (AOM)-induced model of colon carcinogenesis (in which rats develop minimally invasive colonic cancers), Targretin was ineffective as a chemopreventive agent, decreasing neither tumor incidence nor multiplicity. Treatment of Min mice with Targretin for 45 days similarly failed to decrease the multiplicity of small intestinal tumors. Similarly, no preventive efficacy was noted for Targretin when the incidence of tumors in the head and neck model (squamous cell tongue tumors) induced by 4-nitroquinoline 1-oxide (4-NQO) were examined. In contrast, use of even a suboptimal dose of Targretin (40 ppm) in a sensitive breast cancer model [methylnitrosourea (MNU)-induced ER+ mammary cancers] reduced cancer multiplicity by 60%. Finally, based on the hypothesis that Targretin may decrease the expression of COX-2, the effects of Targretin and COX inhibitors were compared in these models. There was minimal overlap of efficacy. That is, models which were relatively susceptible to NSAIDs or COX-2 inhibitors tended not to be sensitive to Targretin and vice versa.
Lubet, Ronald A. Clapper, Margie L. McCormick, David L. Pereira, Michael A. Chang, W-C L. Steele, Vernon E. Fischer, Susan M. Juliana, M. Margaret Grubbs, Clinton J. Nci[hhsn261200433001c] The authors wish to thank Jeanne Hale, Mary Jo Cagle, and Julie Gray for their secretarial and editorial services. Research materials for the studies were in part obtained by the NCI contract number HHSN261200433001C. 28 Spandidos publ ltd Athens 917tx