Reduction of Amyloid in the Brain and Retina After Treatment With IVIG for Mild Cognitive Impairment.

OBJECTIVE:To assess whether intravenous immunoglobulin (IVIG) in subjects with mild cognitive impairment (MCI) results in a reduction in amyloid in the central nervous system (CNS). METHODS:Five subjects with MCI underwent baseline Florbetapir positron emission tomography and retinal autofluorescent imaging. All were administered IVIG (Octagam 10%) at 0.4 g/kg every 14 days for a total of 5 infusions. After 3 months, standard uptake value ratio (SUVR) and amyloid retinal deposits were reassessed. RESULTS:Three subjects had a reduction in amyloid SUVR and all 5 subjects had a reduction in amyloid retinal deposits in at least 1 eye. CONCLUSIONS:A short course of IVIG over 2 months removes a measurable amount of amyloid from the CNS in persons with MCI.