Novel methodology comparing two assay formats for the assessment of immunogenicity from clinical trial samples

Area of Science:

• Biopharmaceutical analysis
• Immunogenicity testing
• Assay validation

Background:

• Comparing immunogenicity assay results between laboratories and across different assay formats can be challenging.
• Ensuring consistent clinical interpretation of immunogenicity data is crucial for biotherapeutic development.

Purpose of the Study:

• To develop and validate a novel methodology for interlaboratory comparison of distinct immunogenicity assays for the same biotherapeutic.
• To assess the impact of assay format and laboratory on the clinical interpretation of immunogenicity results.

Main Methods:

• Generation of human serum pools from clinical trials to represent immunogenicity titers.
• Blinded evaluation of serum pools at two independent laboratories using different assay formats.
• Comparison of assay sensitivity, drug tolerance, and ability to detect treatment-emergent antidrug antibodies.

Main Results:

• Two distinct assay formats were validated by the laboratories, showing comparable sensitivity and drug tolerance.
• The interlaboratory comparison methodology confirmed a consistent ability to detect treatment-emergent antidrug antibodies.
• The pooling approach minimized duplicative results while enabling robust comparisons.

Conclusions:

• A novel, validated approach using pooled patient samples facilitates reliable interlaboratory comparisons of immunogenicity assays.
• This methodology ensures consistent detection of antidrug antibodies, supporting accurate clinical interpretation.
• The established method provides a framework for standardizing immunogenicity assessments across different settings.