No relevant disease model; NSG xenotransplant mice support engraftment of human edited cells (most relevant model)
“No in vivo proof-of-concept studies were conducted as no relevant animal disease model for TDT and SCD exists that could be used for evaluation of exa-cel.”
Irradiated immunodeficient NSG mouse only (xenotransplanted edited human CD34+ cells)
“An in vivo toxicology and tumorigenicity study of SPY101-RNP edited CD34+ hHSPCs from healthy donors was conducted in irradiated NSG mice.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Species: DART
Not conducted (not warranted given product characteristics and safety profile)
“Developmental and reproductive toxicity studies and carcinogenicity studies were not conducted with CASGEVY. These studies are not warranted based on the characteristics and safety profile of the product.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Species: carcinogenicity
Not conducted; tumorigenicity assessed in irradiated NSG mice instead
“Developmental and reproductive toxicity studies and carcinogenicity studies were not conducted with CASGEVY. These studies are not warranted based on the characteristics and safety profile of the product.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Surrogate used in
No surrogate used; edited cells from healthy donors representative of clinical material
“The test material used in these studies are representative of test material used in the clinic and derived from healthy donors.”