HER2+ human breast cancer xenografts in mice, including hCD16A knock-in transgenic mice
“Margetuximab activities were demonstrated in in vivo efficacy studies applying different mouse xenograft models with HER2+ human breast cancer lines.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Why that model
Engineered Fc binds mouse Fc receptors differently from human, so hCD16A knock-in mice were used
“The modified Fc domain reduced binding to mFcγRIII (mCD16), mFcγRII (mCD32), and mFcγRI (mCD64).”
✓ VerifiedFDA multi-discipline review, p. 39Source ↗
Reviewer's view of the efficacy data
FDA: mouse xenograft models may be limited for evaluating the anti-tumor effects of the modified Fc domain
“Due to these differences, results from mouse xenograft models with human tumor cells may be limited in evaluating the anti-tumor effects of the modified Fc domain of margetuximab”
✓ VerifiedFDA multi-discipline review, p. 39Source ↗