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- W2053275211 abstract "Chemoprevention is the use of natural or synthetic compounds to block, reverse, or prevent the development of invasive cancers. Cellular carcinogenesis forms the biologic basis for the identification of chemopreventives, assessment of their activity, and ultimately the success or failure of a chemopreventive. Chemopreventive agents undergo multistep evaluations to assess efficacy that are similar in concept but vastly different in practice to standard ablative oncologic therapeutics. In vitro assessments of potential anticarcinogenesis efficacy include measurements of an agent's antioxidant activity, induction of phase II metabolizing enzymes and effects upon cellular proliferation and apoptotic control pathways. In vivo efficacy is assessed primarily in rodent models of carcinogenesis that are specific for a given organ target. The role of genetically modified animal models in the in vivo assessment of chemoprevention agents remains unclear. Clinical assessment of chemopreventive agent efficacy consists of a multistep process of identification of an optimal chemopreventive agent (phase 1), demonstration of efficacy in humans through the modulation of reversal of a tissue, biochemical, and molecular surrogates for neoplastic transformation and invasion (phase 2) and cancer risk reduction in large cohort trials (phase 3). Opportunities and future needs include the development of reliable, predictive in vivo models of carcinogenesis, careful exploration of the preventive pharmacology of therapeutic agents being used for non-cancer prevention indications, and the incorporation of genetic risk cohorts to define cancer chemopreventive efficacy." @default.
- W2053275211 created "2016-06-24" @default.
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- W2053275211 date "2000-03-01" @default.
- W2053275211 modified "2023-10-17" @default.
- W2053275211 title "Chemoprevention: general perspective" @default.
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- W2053275211 doi "https://doi.org/10.1016/s1040-8428(99)00072-4" @default.
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