Abstract
The use of LC-MS(/MS) assays to quantify (biotherapeutic or biomarker) proteins is commonplace and well accepted across industry. There is a good understanding on the added value over conventional analytical technologies (i.e., ligand-binding assays). In fact, the impact of combining small- and large-molecule technologies for large-molecule analysis has played a significant part in bringing the bioanalytical communities closer together and building a mutual respect and understanding between scientists. This paper from the European Bioanalysis Forum presents a history of the journey and future perspectives for hybrid assays, with focus on the unanswered scientific questions, including regulatory discussions to be had. Hybrid assays are essentially a combination of ligand-binding assays and MS, and the ICH M10 guideline does not address this approach directly. Decision-based acceptance criteria are still being discussed, and the industry should continue to do so.
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