Lymphoid hyperplasia, lymphoid depletion and increased plasma cells in lymph nodes of rats and dogs
“findings correlated with histologic signs in the lymph nodes in the 3-month studies in rats and dogs, including minimal to moderate lymphoid hyperplasia, lymphoid depletion, and increases in plasma cells, as well as hypocellularity in rats.”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗
Biodistribution & persistence
Rat QWBA: peak tissue levels within 4 h after oral dosing; no retention in melanin-containing tissues
“For all tissues, the highest measured concentrations were observed within 4 hours and 0.5 hours post dose for the oral and IV routes, no specific retention was observed in melanin-containing tissues.”
“Overall, mirdametinib is considered as a selective developmental toxicant, and the clinical relevance of drug-induced embryofoetal lethality identified in rats and rabbits cannot be excluded.”