Neutralizing Antibody (NAb) & Total Antibody (TAb) Assays
Precision has extensive experience in developing neutralizing antibody and total antibody assays to measure pre-existing antibodies to gene therapy viral vector-based therapeutics across multiple types of vectors and capsid types, and can support development of gene therapy NAb/TAb assays into commercial CDx
Expertise in NAb/TAb assays for gene therapy
Precision scientific team has developed and validated both NAb and TAb assays in both humans and NHP for several capsid types.
In addition, Precision has run >8,000 samples on GxP-validated assays and continues to support the most prominent companies developing gene therapies.
Development of a NAb CDx for a gene therapy
Problem
Because preexisting antibodies may hamper transduction efficiency and reduce efficacy of AAV5 vector-based therapy, the sponsor wanted us to develop and validate an AAV5 NAb CDx to identify patients most likely to benefit from treatment.
Solution
We developed and optimized a cell-based luciferase reporter assay that could detect and measure anti-AAV5 capsid antibodies capable of neutralizing viral transduction of HEK 293 cells. This project included maintenance of the cell bank, running the assay, and testing clinical samples.
We are also developing a single-site CDx using our ISO 13485-certified and FDA 21 CFR 820-compliant laboratory facilities. As of early 2019, this project included full regulatory, biostatistical, and commercial services for the CDx, including both strategic and tactical support for all activities throughout the product life cycle.
Proven results
Our Precision experts have pioneered and detailed some of the industry standard guidelines for NAb/TAb assays in the context of AAV gene therapy.
See all resources-
Research Article
AAPS Recommendations for the Development of Cell Based Anti Viral Vector Neutralizing Antibody Assays 2020
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Research Article
AAPS Evaluation of the Humoral Response to Adeno-Associated Virus Based Gene Therapy Modalities Using Total Antibody Assays (2021)
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Regulatory solutions for NAb/TAb CDx
Precision also support development and commercialization of total antibody and neutralizing antibody companion diagnostics, including:
- FDA diagnostic pre-submission and modular PMA submissions
- Complete LDT analytical studies under full design control
Our experience speaks for itself-we’ve already successfully completed over 100 CDx regulatory filings globally
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