“The in vivo antitumor activity of umbralisib was evaluated in a MOLT-4 xenograft model. MOLT-4 tumor-bearing mice were dosed orally with umbralisib at 150 mg/kg/day for 25 days, with the measurement of tumor growth continuing until 41 days after dosing initiation.”
✓ VerifiedFDA multi-discipline review, p. 28Source ↗
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
FDA: nonclinical pharmacology and toxicology data adequate to support approval
“The nonclinical pharmacology and toxicology data submitted to this NDA are adequate to support the approval of umbralisib for the proposed indications.”
✓ VerifiedFDA multi-discipline review, p. 30Source ↗