No relevant species; in vitro cross-reactivity/alloreactivity and murine xenograft pharmacology only
“Standard in vivo single-dose or repeat-dose toxicity studies were not conducted with afamitresgene autoleucel due to the lack of appropriate animal models for testing of human TCR engineered T-cells.”
✓ VerifiedFDA multi-discipline review, p. 39Source ↗
Why that species
HLA-restricted human TCR: MHC mismatch with animals; humanized mice develop lethal xeno-GvHD within 8 weeks
“Because afamitresgene autoleucel is an autologous engineered-TCR T-cell therapy, there is a mismatch of MHC antigens between animal and human TCRs, so specificity cannot be assessed.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Surrogate molecule
No surrogate; engineering an animal TCR judged uninformative for human TCR specificity/safety
“Engineering an animal TCR for use in animal model testing would also not reflect the specificity/safety profile of the human TCR, and therefore would be uninformative.”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗
Species: general tox
None; no in vivo toxicity studies (no appropriate animal model for human TCR-engineered T cells)
“Standard in vivo single-dose or repeat-dose toxicity studies were not conducted with afamitresgene autoleucel due to the lack of appropriate animal models for testing of human TCR engineered T-cells.”
✓ VerifiedFDA multi-discipline review, p. 39Source ↗
Species: DART
Not conducted; acceptable based on product characteristics and safety profile
“No animal reproductive and developmental toxicity studies were conducted with TECELRA which is acceptable based on the product characteristics and safety profile.”
✓ VerifiedFDA summary basis for approval, p. 13Source ↗
Species: carcinogenicity
Not conducted (no relevant animal models)
“Afamitresgene autoleucel is a human TCR engineered T-cell product, therefore conventional carcinogenicity studies were not performed due to the lack of relevant animal models.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Surrogate used in
No surrogate used; an animal TCR was judged uninformative
“Engineering an animal TCR for use in animal model testing would also not reflect the specificity/safety profile of the human TCR, and therefore would be uninformative.”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗