No dedicated immunotoxicity studies; decreased cellularity of haematopoietic and lymphoid organs in rats and monkeys
“Although no dedicated immunotoxicity studies were conducted with pralsetinib, some of the toxicological findings reported in repeat-dose toxicity studies were related to its actions on immune system (i.e., decreased cellularity of multiple haematopoietic and lymphoid organs in rats, and bone marrow cellularity and decreased cellularity of lymphoid organs in monkeys).”
Wide distribution (intestine, liver, adrenal, uveal tract, pigmented skin); melanin affinity; crosses blood-brain barrier in rats
“Following single oral administration, 14C-pralsetinib-derived radioactivity distributed widely to rat tissues especially the small intestine wall, liver, adrenal gland, uveal tract, and pigmented skin. Pralsetinib crossed the blood-brain barrier in rats”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗
Modality-specific risk
Embryofetal toxicity: renal malformations consistent with the role of RET in renal organogenesis
“The observed renal malformations/variations were consistent with the role of RET in renal organogenesis. The pharmacology/toxicology team recommends a warning for embryo-fetal toxicity in the label for GAVRETO.”
✓ VerifiedFDA multi-discipline review, p. 44Source ↗