Aged PDAPP transgenic mice (amyloid plaques) treated with murine surrogate mE8c: dose- and effector-dependent plaque reduction
“Donanemab binds to N3pE containing amyloid beta plaques, which were demonstrated to be reduced via typical antibody clearance mechanisms in aged PDAPP mice treated with murine surrogate mE8c in a dose-and effector-function dependent manner.”
Donanemab not pharmacologically active in normal rodents or nonrodents; on-target effects studied in PDAPP mice with murine surrogate mE8c
“Donanemab is not pharmacologically active in normal rodent or nonrodent; therefore, toxicity studies were conducted in cynomolgus monkey (6-week IV donanemab) to assess for any off-target toxicity, and in the PDAPP transgenic mouse model (6-week and 6-month SC mE8c, a murine surrogate) to assess for relevant on-target effects”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Reviewer's view of the efficacy data
EMA: proof of concept sufficiently demonstrated via surrogate plaque clearance in aged PDAPP mice
“Overall, the proof of concept has been sufficiently demonstrated.”