Lymphoid depletion in spleen and thymus in high-dose rat decedents
“Histological examinations of these animals showed hemorrhage and acute inflammation of the cecum; luminal dilatation of the duodenum, jejunum, ileum, and colon; and lymphoid depletion in the spleen and thymus.”
✓ VerifiedFDA multi-discipline review, p. 33Source ↗
Biodistribution & persistence
Mostly confined to GI tract; at 24 h radioactivity measurable only in liver and GI tract, plus uveal tract in pigmented rats
“Excluding the uveal tract in the Long Evans rat, radioactivity concentrations in tissues of both rat strains were measurable only in the liver and GI tract at 24 hours postdose.”
✓ VerifiedFDA multi-discipline review, p. 148Source ↗
Modality-specific risk
Juvenile toxicity: juvenile rat NOAEL 0.1 mg/kg/day gives no safety margin for pediatric patients <12 years
“The NOAEL was determined to be 0.1 mg/kg/day, which does not provide a margin of safety to support study of pediatric patients <12 years of age.”
✓ VerifiedFDA multi-discipline review, p. 34Source ↗