MCF7 xenograft mice: tumor shrinkage (124% TGI) and >94% ER reduction at 30 mg/kg/day
“In the ER+ ESR1 WT MCF7 xenograft model, 30 mg/kg/day of vepdegestrant led to tumor shrinkage (124% TGI on Day 28) and reduced ER levels by >94% in tumor tissue, and both ER degradation and TGI were significantly better following vepdegestrant treatment compared to fulvestrant in this model.”
✓ VerifiedFDA multi-discipline review, p. 51Source ↗
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
FDA: tumor growth inhibition and ER reduction in wild-type and mutant ER xenograft and PDX models
“In vivo, vepdegestrant inhibited tumor growth and reduced ER levels in tumor tissue in mouse xenograft models expressing either wild-type or mutant ER, as well as in patient-derived xenograft (PDX) models.”
✓ VerifiedFDA multi-discipline review, p. 47Source ↗