ER+ breast cancer xenograft and PDX mouse models, including ESR1-Y537S mutant PDX
“Imlunestrant was well tolerated and induced significant tumor growth inhibition and tumor regressions in multiple ER+ breast cancer xenograft models, including an ESR1-Y537S mutant PDX model.”
✓ VerifiedFDA multi-discipline review, p. 43Source ↗
Why that model
Not stated in public reviews
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
EMA: xenograft primary pharmacology studies relevant for the indicated patient populations
“Cellular and murine xenograft studies were conducted in oestrogen receptor (ER)-positive breast cancer models, with or without oestrogen receptor gene 1 (ESR1) mutations, along with an evaluation of imlunestrant’s functional additivity or synergy with the CDK4/6 inhibitor abemaciclib. These primary pharmacology studies are, therefore, relevant for the indicated patient populations.”