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Molecular and Pharmacological Mechanisms of Drug Resistance:An Evolving Paradigm

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Mechanisms of Drug Resistance in Cancer Therapy

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 249))

Abstract

The high heterogeneity and genomic instability of malignant tumors explains why even responsive tumors contain cell clones that are resistant for many possible mechanisms involving intracellular drug inactivation, low uptake or high efflux of anticancer drugs from cancer cells, qualitative or quantitative changes in the drug target. Many tumors, however, are resistant because of insufficient exposure to anticancer drugs, due to pharmacokinetic reasons and inefficient and heterogeneous tumor drug distribution, related to a deficient vascularization and high interstitial pressure. Finally, resistance can be related to the activation of anti-apoptotic and cell survival pathways by cancer cells and often enhanced by tumor microenvironment.

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Correspondence to Maurizio D’Incalci .

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© 2017 Springer International Publishing AG

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Colmegna, B., Morosi, L., D’Incalci, M. (2017). Molecular and Pharmacological Mechanisms of Drug Resistance:An Evolving Paradigm. In: Mandalà, M., Romano, E. (eds) Mechanisms of Drug Resistance in Cancer Therapy. Handbook of Experimental Pharmacology, vol 249. Springer, Cham. https://doi.org/10.1007/164_2017_20

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