Cell and Gene Therapy
Viral Vector, Oncolytic Virus, Stem Cell, CAR-T/TCR-T, CAR-NK, TIL, etc
Cell and gene therapies (CGT) are advanced biological products including viral vectors, oncolytic viruses, stem cells, CAR-T/TCR-T, CAR-NK, and tumor-infiltrating lymphocytes (TILs). Due to their unique mode of action (MOA), the manufacturing processes of these emerging biologics are more complex compared to traditional biologics and small molecule therapeutics. They require stringent GMP controls while experiencing rapid market growth. To ensure final product quality, developing science-driven, process-informed biosafety testing strategies that meet global regulatory standards is essential.
Biosafety Strategy for Cell and Gene Therapy
Viral Seed characterization

Virus bank manufacturing is a critical step in producing biopharmaceuticals like vaccines and CGT.

Biosafety Consideration of Virus Bank Manufacturing
Master and Working Virus Seeds Stocks provide the foundational viral material for generating viral vectors or vaccine candidates (live-attenuated/inactivated viruses). To ensure downstream manufacturing success, virus banks must preserve identity, quality, and stability while strictly complying with cGMP standards and regulatory guidelines (FDA/EMA/ICH). It is important to ensure there is no bacterial, fungal, mycoplasma, or adventitious viral agent contamination is present. Therefore, safety testing is essential during the manufacturing process of CGT and vaccines.
Regulatory requirement
All viral seed stock shall be characterized according to the requirements of European Pharmacopoeia 2.6.16 and FDA2010 Guidelines for the management and quality control of bacterial/viral seed banks. Regulations require the use of neutralizing antiserum for post-neutralization tests.
BRC Solutions for Microbial Bank Characterization
The sponsor should provide the neutralization titer required by the corresponding antiserum and antiserum, while showing that the antiserum is free of contamination. If neutralizing antisera is not available, molecular assays can be performed using NAT (PCR and NGS) or using control cells.

Testing for Working Viral Seed Stocks 


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