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Our previous experimental data demonstrated that a new gastrin receptor antagonist (CR2945) has a chemopreventive effect on dimethylhydrazine-induced colon cancer in mice. The aim of this study is to test the effect of CR2945 on the appearance and distribution of aberrant crypt foci (ACF), proposed as early “preneoplastic” lesions in colon carcinogenesis, in the murine model. 176 CD1 male mice were randomly divided into 4 groups: group 1, sham group received 2 daily intra-peritoneal injections of saline solution; group 2 received 1 weekly intra-peritoneal injection of DMH 20 mg/kg, for 5 weeks, and 2 daily intra-peritoneal injections of equal volume of NaC1 0.9%; group 3 and 4 received the same weekly dose of DMH and 2 daily injections of CR2945 at the respective doses of 2.5 and 7.5 mg/Kg for 5 weeks.