Abstract
Incorporation of pharmacokinetic information of anticancer drugs into routine patient care can contribute to drug dosage individualization and account for differences among patients in rates of drug metabolism and/or excretion. The standard analytical methods for measuring concentrations of drugs in plasma determine drug bound to plasma proteins as well as free drug dissolved in plasma water. For this reason, the relationship between total drug concentration in plasma and treatment outcome (i.e., toxicity and efficacy) will only be good if the degree of plasma protein binding of the agent is constant, or if so little drug is protein bound that changes in binding make insignificant changes in unbound concentration. A review of available literature data indicates that, in general, protein binding of anticancer drugs is not of principal clinical relevance. However, there are several instances in which monitoring of unbound concentrations might be useful: (1) agents demonstrating protein concentration-dependent binding, (2) agents that bind irreversible or near covalently, (3) when formulation excipients modulate unbound drug levels, and (4) metabolically interconversible agents. While available evidence suggests that for these agents unbound drug levels correlate better with clinical effects than total plasma concentrations, there are insufficient data to justify the recommendation of the routine use of unbound drug concentration monitoring for most of these agents at present.
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Sparreboom, A., Loos, W.J. (2014). Protein Binding. In: Rudek, M., Chau, C., Figg, W., McLeod, H. (eds) Handbook of Anticancer Pharmacokinetics and Pharmacodynamics. Cancer Drug Discovery and Development. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9135-4_13
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