The circadian-timing system: a determinant of drug activity and a target of anticancer treatments

Annales pharmaceutiques françaises
Francis Lévi

Abstract

Cellular proliferation and drug detoxification are controlled over the 24h by the circadian-timing system, whose disruption can favor malignant processes. Thus, prolonged shift work appears to increase the risk of breast, colon or prostate cancer. Alterations in circadian physiology and/or molecular-clock genes accelerate cancer progression in experimental models and in cancer patients. In addition, anticancer treatments can also dampen or reinforce the circadian-timing system, as a function of dose and time of administration. The adjustment of anticancer-drug delivery to the circadian-timing system (chronotherapeutics) has allowed to reduce five-fold the incidence of severe adverse events as compared to constant rate infusion or wrongly-timed chronomodulated delivery in cancer patients. In experimental models, the best antitumor efficacy is usually obtained following treatment delivery near the least toxic time, a statement that also seems to apply to patients. Dedicated technologies include programmable in time pumps and rhythm monitors and are required for chronotherapeutics. Recent results have revealed that the optimal chronotherapeutic schedule could differ as a function of gender and circadian physiology. In conclusion, ...Continue Reading

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