alexa Tumor-based rhythms of anticancer efficacy in experimental models.
Toxicology

Toxicology

Journal of Clinical Toxicology

Author(s): Granda TG, Lvi F

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Abstract Experimental tumor models constitute a prerequisite toward chronotherapy testing in cancer patients. Studies in experimental models are required to understand the relation between tumor rhythms and antitumor treatments efficacy. In healthy tissues, cell proliferation, and differentiation processes are regulated precisely and exhibit marked circadian rhythmicity. Experimental and human tumors can retain circadian rhythms or display altered oscillations. Healthy tissues can also display rhythm modifications, possibly related to cancer stage. Cellular rhythms modulate the metabolism of cytotoxic agents and the cellular response to them; hence, they determine the chronopharmacology of anticancer drugs. Circadian rhythms in host tolerability and/or cancer chemotherapy efficacy have been demonstrated with nontoxic doses of drugs in several experimental tumor models, while in other ones a circadian-time effect was only seen within a specific dose range. The usual coupling between tolerability and efficacy rhythms of anticancer agents has resulted in significant improvement of their therapeutic index. Results of laboratory animal studies have been extrapolated to the design of clinical cancer therapy trials involving a chronobiological approach.
This article was published in Chronobiol Int and referenced in Journal of Clinical Toxicology

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