“Additional target organs in rats included the hemolymphoid system (lymphoid depletion), male and female reproductive organs, and skeletal muscle (myofiber degeneration/regeneration and hemorrhage) in male rats in the 28-day study.”
✓ VerifiedFDA multi-discipline review, p. 34Source ↗
Biodistribution & persistence
Rat: highest in uveal tract, eyes, pigmented skin, liver, testes; not detected in CNS
“the highest distribution of tucatinib in rats was in the uveal tract, eyes, pigmented skin, liver, testes, epididymis (male), and thymus (female); tucatinib was not detected in CNS tissues.”
✓ VerifiedFDA multi-discipline review, p. 33Source ↗
Modality-specific risk
GI and liver toxicity (major toxicities in rats and monkeys)
“Toxicities in the GI system and liver were observed in both rats and monkeys and are considered the major toxicities associated with tucatinib treatment.”
✓ VerifiedFDA multi-discipline review, p. 34Source ↗