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Bioprocess development usually is carried out in systems with small working volumes. This helps save time and resources because, at small scale, several experiments can be conducted in parallel. Costs for media are kept low, and relatively little laboratory space is required to operate small-scale bioreactors. But over the course of development, biopharmaceutical companies need more material for characterization, trial runs, and finally for commercialization.
Recombinant protein manufacturing with Chinese hamster ovary (CHO) cells represents over 70% of the entire biopharmaceutical industry (1). In fact, human monoclonal antibodies (hMAbs) produced by CHO cells have played a major role in both the diagnostic and therapeutic markets for decades. One of the first human–mouse chimeric MAbs to obtain FDA approval was Roche’s rituximab treatment for non-Hodgkin’s lymphoma, chronic lymphocytic leukemia, and rheumatoid arthritis.
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