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This International Standard recommends the handling, documentation, storage and processing of formalin fixed and paraffin embedded (FFPE) tissue specimens intended for the examination of isolated proteins during the pre-examination phase before a molecular assay is performed. This International Standard is applicable to molecular in vitro diagnostic examinations including laboratory developed tests performed by medical laboratories and molecular pathology laboratories. It is also intended to be used by laboratory customers, in vitro diagnostics developers and manufacturers, but also pertains institutions and commercial organizations performing biomedical research, biobanks, and regulatory authorities. This document is not applicable for protein examination by immunohistochemistry. NOTE - International, national or regional regulations or requirements may also apply to specific topics covered in this International Standard.