No dedicated immunotoxicity study; no immunotoxicity findings in the nonclinical or clinical program
“The Applicant has justified that no dedicated immunotoxicity study was performed, since no immune adverse effects are expected from the pharmacological properties. In addition, no immunotoxicity findings were observed in the non-clinical or clinical program.”
“Minimal brain to plasma ratio of paltusotine (<0.05) was observed in rats. QWBA study demonstrated a preferential binding to melanin containing tissues, namely the meninges, uveal tract, and the pigmented skin.”
Phototoxicity with retinal degeneration in pigmented rats (ocular safety concern), plus neurotoxicity at excessive doses
“Paltusotine demonstrated potential for phototoxicity, with animal studies showing possible signals for retinal and corneal AEs, raising concerns about ocular safety in humans. Animal studies revealed neurotoxicity at excessive doses.”