[Alzheimer's disease neuroimaging initiative and mild cognitive impairment]

Alzheimer's disease (AD) generally begins with mild memory problems in an insidious manner and progresses to develop multiple cognitive as well as functional impairment within a few years. Currently, the diagnosis of AD requires multiple cognitive deficits including memory disturbance and exclusion of other dementing disorders. However, normal elderly people quite commonly complain of increasing forgetfulness with age. Mild cognitive impairment (MCI) is generally regarded as an intermediate state between normal aging and dementia. In other words, MCI refers to persons that are not normal nor clinically diagnosed dementia. (Winblad et al. J. Intern. Med. 2004). When daily functioning is impaired as a result of cognitive decline, dementia is the appropriate diagnostic label. Alzheimer's Disease Neuroimaging Initiative (ADNI) aims at; 1) Major goal is collection of data and to establish a brain imaging and biomarker database; 2) Determine the optimum methods for acquiring and processing images for clinical trials: 3) Develop "standards" for imaging, biomarkers; 4) "Validate" imaging and biomarker data by correlating with behavioral data to facilitate new AD therapies by disease modifiers. Japan-ADNI will be started as a part of world wide ADNI. Currently, gamma-secretase modifiers and Abeta aggregation inhibitors as well as amyloid vaccination are under clinical trials.