FDA Wants Host Cell Protein Immunogenicity Info

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FDA has opened a public docket to receive information and comments on evaluating and mitigating the immunogenicity risk of host cell proteins (HCPs). A Federal Register notice says the agency is specifically interested in comments on suitable methods to detect, identify, and quantify HCPs, on achievable residual amounts of HCPs for recombinant peptide products, and on the use of in vitro, in silico (on a computer) immunogenicity assessment of HCPs in a recombinant peptide product. Specific questions raised in the notice for response are:

  • the lowest and routinely achievable level of total HCPs across well-controlled recombinant peptide manufacturing processes and how they are calculated or established;
  • the challenges in reducing HCP levels;
  • the analytical methods currently used to detect, identify, and quantify HCPs in a recombinant peptide product;
  • the generally achievable percent coverage of the HCP spectrum for an HCP quantification assay;
  • the qualitative or quantitative characteristics of HCPs associated with a higher likelihood of adverse clinical sequelae; and
  • the tools currently used or planned for use to compare the potential immunogenicity risk of two products with different HCP profiles.

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