The use of surrogate matrices in bioanalytical preclinical safety testing using chromatographic methods: a recommendation from the European Bioanalysis forum.

Within the bioanalytical community, the use of blank matrix from preclinical animals for bioanalytical method validation and sample analysis is common practice and required in the context of guidelines for bioanalytical method validation. At the same time, its use has been challenged by the scientific community for decades, since there is ample scientific evidence to allow the use surrogate matrices for this purpose. Nevertheless, legacy and current regulatory thinking continues to be reluctant to allow the use of surrogate matrices in bioanalytical testing except for so-called rare matrices. As part of ongoing discussions in relation to the ICH M10 Guideline, the European Bioanalysis Forum re-challenges the unnecessary use of blank matrices from preclinical animals and believes that, as part of community responsibility and ethical standards and when supported by data, the use of surrogate matrices should become widely accepted. It is in this context that targeted experiments were conducted within the European Bioanalysis Forum to gather additional data and re-open the discussions with all involved and that it should become acceptable to use surrogate matrices wherever possible.