Decreased white blood cells and lymphoid depletion
“Drug-related findings included decreased white blood cells (WBCs) and differentials, increased liver weights and alkaline phosphatase (ALP) levels, and lymphoid depletion.”
✓ VerifiedFDA multi-discipline review, p. 29Source ↗
Biodistribution & persistence
Wide distribution in mice; lowest concentration in brain, limited CNS passage
“In mice, umbralisib was widely distributed, with the highest concentrations in the gastrointestinal, metabolic/excretory, fatty, secretory, and endocrine tissues and the lowest concentration in brain, demonstrating penetration of umbralisib occurred in richly perfused organs, while passage to the CNS was limited.”
✓ VerifiedFDA multi-discipline review, p. 35Source ↗
Modality-specific risk
Embryo-fetal toxicity (malformations at exposures comparable to clinical)
“In animal reproduction studies, administration of umbralisib to pregnant mice during organogenesis resulted in adverse developmental outcomes, including alterations to growth, embryo-fetal mortality, and structural abnormalities at maternal exposures (AUC) comparable to those in patients at the recommended dose of 800 mg (see Data ) .”