Faster, Safer, More Comprehensive Viral Detection in Biologics Manufacturing
January 25, 2021 Marie-Ange Kouassi
In modern healthcare, the most advanced therapies for treating disease are derived from or produced by living cells. Commonly referred to as biologics, examples include proteins such as monoclonal antibodies and insulin as well as, fragments of DNA or RNA delivered via viral vectors, and vaccines. The manufacturing of biologics presents unique challenges, not only in their complexity, but also in their biosafety requirements.
Biotherapeutics, including new cell and gene therapies are vulnerable to contamination (e.g., by viruses). These contaminants must be detected early to prevent delays in the production process which would impact the time to market of the therapy. Dr. Jürgen Mülberg, a viral biosafety expert at Bristol Myers Squibb, recently highlighted Next Generation Sequencing (NGS) as a promising alternative to existing testing methods as it has the benefit of yielding significantly faster results1.
Traditional viral safety test methods include in vivo testing, indicator cell-based infectivity assays, and nucleic acid technology (NAT)-based tests. In vivo animal models are challenging as they take approximately 4–5 weeks delaying the subsequent manufacturing stages, downstream decision-making, and clinical stages. They have also been shown to be less sensitive and reliable than alternative molecular methods such as PCR. Although more reliable, PCR-based tests are also limited as they cannot detect unknown viruses in viral biopharmaceuticals.NGS enables unbiased testing to detect known and unknown viruses, while providing results more quickly.
A targeted NGS method can be used by manufacturers to avoid contamination of entire facilities and production batches through early, highly sensitive detection of adventitious agents2.
Regulations outlined in the Code of Federal Regulations (CFR, Title 21), the US, and European Pharmacopeia, state that while manufacturing biologics, viral safety measures are crucial3. Such measures exist in three pillars – Prevention, Detection, and Removal – and consider aspects of manufacturing facility design, control techniques, testing stages, and purification processes to remove impurities. Currently, regulatory bodies such as the WHO, FDA, and the European Pharmacopeia Commission, recognize the advantages NGS brings and encourage substituting in vivo testing3,4, 5.
Failure to detect adventitious viruses in the production process can lead to facility downtime and severe economic losses. Ultimately, these consequences damage the reputation of a biopharmaceutical company. An example is the minute virus of mice (MVM) that infects rodents and their derivative cells, such as Chinese hamster ovary (CHO) cells. This environmentally stable virus has been problematic for several biopharmaceutical companies6 as early as the 1990s, leading to product losses and delays of treatment delivery to patients7.
NGS has the potential to accelerate clinical timelines providing a faster method of detecting contaminants throughout the biologics manufacturing process. Scientists can use NGS (a targeted assay) to shorten in-process validation times, accelerating the drug development process. With the growing number of novel biologics and biosimilars entering the market, manufacturers could reduce both time and risk by incorporating NGS-based testing into their workflows. Ultimately, this will maximize resources and accelerate the delivery of treatments to patients with critical health needs.