Advances in analytical characterization and increased understanding of drug mechanisms of action have resulted in the ability to raise the quality and safety of biosimilars by introducing critical quality attributes (CQA), which must be preserved during the manufacturing process. However, to realize these benefits, biosimilars manufacturers must develop the means to ensure these CQAs are met. For afucosylated IgG1s that rely on afucosylation content for efficacy, this has been challenging, since precisely matching both afucosylation content and biological activity has proven to be extremely difficult. In a recent paper, Chung and Zhan [1] elaborate on the underlying basis of these difficulties and highlight the work of several groups that has opened a path to directly addressing this problem.
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