
FDA Releases Guidance on Immunogenicity Testing of Therapeutic Proteins
The agency publishes draft guidance on assay development and validation for immunogenicity testing.
On April 22, 2016, FDA released
Specifically, the guidance discusses assay design elements including testing strategies such as a multi-tiered testing approach, immunoglobulin isotypes, and epitope specificity. The following are also addressed:
- Assay cut point
- Sensitivity, including assay sensitivity and drug tolerance
- Specificity and selectivity, including matrix interface and minimal required dilution
- Precision
- Reproducibility
- Robustness and sample stability
- Format selection
- Reagent selection, including development of positive control antibodies, development of negative controls, detection reagent consideration, and controlling non-specific binding
- Reporting results for qualitative and semi-quantitative assays
- Other considerations including pre-existing antibodies, rheumatoid factor, monoclonal antibodies, conjugated proteins, and products with multiple functional domains.
Assay development information provided addresses the following:
- Development of a screening assay
- Development of a confirmatory assay, including selection of format for confirmatory assay and cut point of confirmatory assay
- Development of titering assay, including titer determination and cut point of titering assay
- Development of neutralization assay, including selection of format, activity curve, considerations for matrix interface, and cut point.
The assay validation section covers general considerations and recommendations for validation of screening, confirmatory, titering, and neutralization assays. Additional sections address implementation of assay testing and documentation.
Source:
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