Cynomolgus monkey (pivotal IT tox); FVB mice for ICV safety and fertility/EFD; SMA piglet and SMN-delta7 mouse pharmacology
“In vivo toxicology/safety studies conducted in NHPs utilized a single IT administration of OAV101 at 1.2 x 1013 vg/animal, considered equivalent to the proposed starting clinical dose level for ITVISMA of 1.2x1014 vg/patient based on a 10-fold difference in CSF volume between NHP and human.”
✓ VerifiedFDA summary basis for approval, p. 15Source ↗
Why that species
NHP IT delivery transduces 55-79% of ChAT+ spinal motor neurons; CSF volume scaling NHP to human
“IT administration of scAAV9.CBA.SMN demonstrated a 55-79% transduction efficiency of choline acetyltransferase (ChAT) positive motor neurons in NHP spinal cords.”
✓ VerifiedFDA summary basis for approval, p. 15Source ↗
Surrogate molecule
No surrogate; research-grade lots (scAAV9.CBA.SMN, OAV101, OAV101B) of the clinical vector, OAV101B most comparable
“The nonclinical development program for ITVISMA evaluated research grade lots, referred to as scAAV9.CBA.SMN, OAV101, and OAV101B, to inform the safety and activity of ITVISMA.”
✓ VerifiedFDA summary basis for approval, p. 15Source ↗