Monkey IV 25 mg/kg/week for 37 weeks (no fertility effects): Cavg,ss ~15x human exposure at MRHD
“No effects on fertility parameters such as reproductive organs, reproductive hormones or menstrual cycle length were observed in sexually mature female cynomolgus monkeys that were administered intravenous doses of lebrikizumab-lbkz up to 25 mg/kg/week for 37 weeks, which was associated with plasma exposure (C avg,ss ) approximately 15 times the human exposure at the MRHD.”
NOAEL = highest dose: 22.7 mg/kg/week (6-week IV), 25 mg/kg/week (9-month IV and 13-week SC)
“The NOAEL for lebrikizumab in cynomolgus monkeys was the highest dose tested in all three studies, i.e., 22.7 mg/kg/week in the 6-week intravenous toxicology study and 25 mg/kg/week in the 9-month intravenous toxicology study and 13-week subcutaneous toxicology study.”
✓ VerifiedFDA multi-discipline review, p. 50Source ↗