The consistent pharmacological signature of RNAi
RNAi achieves rapid 1 log10 reduction in protein within 2 weeks Reduction is saturated– even with repeated dosing
Target RNA can not be completely cleared with RNAi approach
Inconsistent with RNAi effect HBsAg turns over rapidly (½ life 1-6 days)[1,2]
Consistent with TLR3 stimulation observed with poly I:C in mice JNJ-3989 (ARO-HBV)
Observation of upper respiratory tract infections consistent with TLR3 stimulation in the lung[3-5]
Also observed for ARC-520 (LNP), ARO-AAT (GalNAc) and ALN-AAT (GalNAc)Increased cytokine responses consistent with TLR3 activation observed with ARC-520[6-9]