“The pivotal repeat-dose toxicity studies with tafamidis were conducted in rats for up to 26 weeks of oral dosing and in dogs for up to 39 weeks of oral dosing.”
✓ VerifiedFDA pharmacology/toxicology review, p. 13Source ↗
Why that species
Rat and dog expected to show a pharmacologic response to tafamidis similar to humans
“These findings add relevance to the rat, rabbit and dog toxicology studies as they can be expected to exhibit a similar pharmacologic response to tafamidis as in humans.”
✓ VerifiedFDA pharmacology/toxicology review, p. 21Source ↗
Surrogate molecule
No surrogate; the clinical compound was tested
“The pivotal repeat-dose toxicity studies with tafamidis were conducted in rats for up to 26 weeks of oral dosing and in dogs for up to 39 weeks of oral dosing.”
✓ VerifiedFDA pharmacology/toxicology review, p. 13Source ↗
Species: general tox
Rat (up to 26 weeks) and dog (up to 39 weeks)
“The pivotal repeat-dose toxicity studies with tafamidis were conducted in rats for up to 26 weeks of oral dosing and in dogs for up to 39 weeks of oral dosing.”
✓ VerifiedFDA pharmacology/toxicology review, p. 13Source ↗
Species: DART
Rat and rabbit (chosen for background data and TTR homology with humans)
“Rats and dogs were selected for use in general toxicology studies and rats and rabbits were selected for reproductive and developmental toxicity studies based on extensive background information available in these species and because of the high homology between TTR in humans, rats, rabbits, and dogs.”
✓ VerifiedFDA pharmacology/toxicology review, p. 74Source ↗
Species: carcinogenicity
Tg.rasH2 mouse (26-week) and Sprague Dawley rat (2-year)
“Carcinogenicity were evaluated in Tg.rasH2 transgenic mice dosed at 10, 30, or 90 mg/kg/day for 26 weeks and in Sprague Dawley rats dosed at 3, 10 or 30 mg/kg/day for 2 years. Both studies were considered adequate and found to be negative for increases in tumor findings with the Executive CAC’s concurrence.”
✓ VerifiedFDA pharmacology/toxicology review, p. 13Source ↗
Surrogate used in
No surrogate used; tafamidis tested directly
“The pivotal repeat-dose toxicity studies with tafamidis were conducted in rats for up to 26 weeks of oral dosing and in dogs for up to 39 weeks of oral dosing.”
✓ VerifiedFDA pharmacology/toxicology review, p. 13Source ↗