Objective: To evaluate whether the current case-by-case practice leads to sufficient reporting of immunogenicity-related information in the Summary of Product Characteristics (SmPCs) of biological products approved in the European market.Methods: Immunogenicity-related information was identified and extracted from a group of 73 biological drugs that complied with drug-selection criteria. Afterwards, thirteen dichotomous questions were proposed to evaluate whether any issues are being commonly neglected.Results: Most SmPCs (92%) do not have any recommendations on how to report immunogenicity-related adverse drug reactions by patients or healthcare professionals. Furthermore, 80% of SmPCs do not identify the assay used to assess the reported immunogenicity rates, while 81% do not address the possible impact of immunogenicity on their drug's pharmacokinetics. It was also identified that a group factor (i.e. older drugs' SmPCs) could be influencing how/which issues were being addressed by newerdrugs SmPCs. To transform SmPCs into useful tools when an immunogenic response occurs, a proposal on how to report immunogenicity-related information in the SmPCs of biological products is advanced. This tool can be used by patients, healthcare professionals, regulators and businesses to evaluate the information of SmPCs.
Conclusions:Based on these results, a case-by-case strategy does not yield enough reporting across products and thus immunogenicity-related information should be reported in a systematic way. Further guidance about reporting immunogenicity-related information is required, else SmPCs will not be the basis of information for healthcare professionals on how to use a biological product safely and effectively.