Thymic lymphoid depletion with reduced thymus weight at high dose; not seen after recovery
“In addition, reduced thymus weights correlated with increased incidence and/or severity of thymic lymphoid depletion in HD males and females. Thymic lymphoid depletion was not observed in recovery males or females.”
✓ VerifiedFDA multi-discipline review, p. 72Source ↗
Biodistribution & persistence
No appreciable brain radioactivity; melanin binding (uveal tract, pigmented skin)
“All tissues demonstrated clearance and no appreciable radioactivity was observed in the brain. Melanin-containing tissues (uveal tract and pigmented skin) demonstrated higher tissue retention, indicating some affinity of belumosudil for melanin.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗
Modality-specific risk
Embryofetal toxicity with low safety margins
“In the rabbit embryo-foetal toxicity study, the NOAEL resulted in safety margin of 0.08, and dog 9-month repeat dose toxicity study NOAELs resulted in safety margins of 0.2 and 0.4, when compared to the expected clinical exposure.”