Rat adjuvant-induced arthritis model (paw swelling, bone erosion, ankle histology)
“An Adjuvant-induced arthritis (AIA) model in rats was also used to determine the efficacy of UPA on the development of paw swelling inhibition, bone erosion, and ankle histology.”
✓ VerifiedFDA pharmacology/toxicology review, p. 46Source ↗
Why that model
Not stated in public reviews
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
EMA: cellular EC50s covered by clinical Cmax, so JAK1 and JAK1/3 activity expected at therapeutic concentrations
“Both these EC50 values are well covered by the clinical Cmax of upadacitinib in human plasma following the recommended dosing of 15 mg ER QD. Therefore, pharmacological activity at JAK1 and JAK1/3 could be expected at therapeutic plasma concentrations of upadacitinib.”