Increased lymphoid cellularity in lymph nodes in rats and dogs
“Additional target organs in both species included the reproductive system (atrophy and single cell necrosis), lymph nodes (increased lymphoid cellularity), digestive tract (decreased epithelial thickness), eyes (atrophy of the corneal epithelium), and larynx (decreased epithelial thickness).”
✓ VerifiedFDA multi-discipline review, p. 43Source ↗
Biodistribution & persistence
Wide distribution in rats, including uveal tract; low brain penetration
“Following single oral administration, [14C]mobocertinib-derived radioactivity distributed widely to rat tissues including the liver, adrenal gland, kidney, alimentary canal, uveal tract, and thyroid but brain penetration was low.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗
Modality-specific risk
QT prolongation in patients not predicted by nonclinical hERG and dog ECG data
“Additionally, the in vivo assessments included in the toxicology studies in dogs did not show QT prolongation or any other cardiac electrophysiologic effects, although QT prolongation, including resultant life-threatening arrhythmias, occurred in patients treated with mobocertinib.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗