Prostate Cancer REsearch Using Cross-validation of Innovative Sampling, Integrating LC-MS/MS for Optimized Therapeutic Drug moNitoring

Applying Dried Blood Spots (DBS) techniques to pharmacokinetic analysis could significantly streamline the use of Therapeutic Drug Monitoring (TDM) in clinical practice. To establish DBS as a viable alternative sampling method, it is essential to demonstrate that results obtained from DBS analysis are reliable. This validation can be achieved through a cross-validation study. In this protocol, an original validated method, the plasma-based assay, serves as the "reference", while the alternative DBS-based analytical technique is the "comparator." The reliability will be defined analysing patients' samples with the new methods and comparing these results with those obtained with the reference LC-MS/MS (Liquid Chromatography-Mass Spectrometry) methods (in plasma). The possibility to apply DBS technique to pharmacokinetic analysis should largely facilitate the application of TDM to clinical practice.