No tox species; sublethally irradiated immunodeficient mice (xenogeneic GVHD proof-of-concept) plus published murine literature
“In the applicant’s POC studies using xenogeneic models, co-administration of human donor Tregs with Tcons demonstrated dose-dependent GVHD inhibition in sub-lethally irradiated immunodeficient mice.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Why that species
Immunodeficient mice allow human Tcon-induced xenogeneic GVHD and Treg mitigation; no relevant tox species stated
“evaluating the ability of human Tcons to induce xenogeneic GVHD”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Surrogate molecule
Yes: published murine HSC, Treg, Tcon studies used as mechanism-of-action support; human cells tested in mouse xenograft
“Instead, in Module 4 of the BLA, the applicant submitted 45 publications delineating the MOAs of HSCs (mouse and human), Tregs (mouse), Tcons (mouse), and their combinations (mouse).”
✓ VerifiedFDA pharmacology/toxicology review, p. 8Source ↗
Species: general tox
None; no toxicology studies
“No toxicology studies were conducted for TREGZI.”
✓ VerifiedFDA pharmacology/toxicology review, p. 36Source ↗
Species: DART
Not conducted; not warranted based on product characteristics, biological activity and safety profile
“No genotoxicity, carcinogenicity, and developmental and reproductive toxicity (DART) studies were conducted for TREGZI. These studies are not warranted based on the product characteristics, biological activity, and safety profile.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Species: carcinogenicity
Not conducted; not warranted
“No genotoxicity, carcinogenicity, and developmental and reproductive toxicity (DART) studies were conducted for TREGZI. These studies are not warranted based on the product characteristics, biological activity, and safety profile.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Surrogate used in
Published murine HSC, Treg and Tcon studies (45 publications) supported mechanisms of action
“Instead, in Module 4 of the BLA, the applicant submitted 45 publications delineating the MOAs of HSCs (mouse and human), Tregs (mouse), Tcons (mouse), and their combinations (mouse).”
✓ VerifiedFDA pharmacology/toxicology review, p. 8Source ↗