Rabbit and horse, with analogous MACI (species-matched autologous cells on ACI-Maix)
“Studies conducted in horses and rabbits compared ACI-Maix or empty defects to analogous products consisting of ACI-Maix seeded with rabbit or horse cells.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Why that species
Critical-sized knee/stifle defect models in load-bearing species; no further rationale stated
“Implantation of MACI secured with a commercially available fibrin sealant resulted in improved repair of critical-sized defects in the knee/stifle”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Surrogate molecule
Yes: analogous product using rabbit or horse autologous chondrocytes on the same membrane
“The products consisted of the same membrane as MACI with rabbit or horse cells, respectively.”
Horse (definitive combined pharm/tox study) and rabbit, using analogous product with species' own cells
“Studies conducted in horses and rabbits compared ACI-Maix or empty defects to analogous products consisting of ACI-Maix seeded with rabbit or horse cells.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Species: DART
Not conducted; local knee administration with minimal systemic entry
“Per the applicant, studies were not conducted to evaluate this safety endpoint because the product is administered locally in the knee with minimal to no product entry systemically.”
✓ VerifiedFDA pharmacology/toxicology review, p. 24Source ↗
Species: carcinogenicity
Not conducted
“The applicant did not conduct carcinogenicity or developmental and reproductive toxicity studies.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Surrogate used in
Yes: all animal studies used analogous products (same membrane seeded with rabbit or horse cells)
“The products consisted of the same membrane as MACI with rabbit or horse cells, respectively.”