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The purpose of the present study was to compare [<jats:sup>11<\/jats:sup>C]WAY100635 binding to the 5\u2010HT<jats:sub>1A<\/jats:sub> receptor in the hippocampus, entorhinal cortex, amygdala and pericalcarine cortex in mild AD patients and elderly controls. AD patients (<jats:italic>n<\/jats:italic> = 7) and elderly control subjects (<jats:italic>n<\/jats:italic> = 8) were examined with positron emission tomography (PET) and [<jats:sup>11<\/jats:sup>C]WAY100635. PET data acquisition was performed with an ECAT EXACT HR system. Wavelet\u2010aided parametric images of nondisplaceable binding potential (<jats:italic>BP<\/jats:italic><jats:sub>ND<\/jats:sub>) were generated using Logan's graphical analysis with cerebellum as the reference region. Correction for partial volume effects was performed with the M\u00fcller\u2013G\u00e4rtner method. Regions of interest (ROIs) were applied to the individual parametric images, and the regional <jats:italic>BP<\/jats:italic><jats:sub>ND<\/jats:sub> was calculated as the average parametric voxel value within each ROI. In addition to comparisons between subject groups, correlations between <jats:italic>BP<\/jats:italic><jats:sub>ND<\/jats:sub> values and scores on the Mini\u2010Mental State Examination, Disability Assessment for Dementia (DAD), and Neuropsychiatric Inventory were expressed by Pearson correlation coefficients. Mean regional <jats:italic>BP<\/jats:italic><jats:sub>ND<\/jats:sub> was lower in AD patients than in control subjects, and the difference was statistically significant for the hippocampus, entorhinal cortex, and amygdala. A statistically significant correlation was obtained between hippocampal <jats:italic>BP<\/jats:italic><jats:sub>ND<\/jats:sub> values and DAD scores. The results of the present study corroborate and extend previous findings of decreased 5\u2010HT<jats:sub>1A<\/jats:sub> binding in AD and strengthen the support for 5\u2010HT<jats:sub>1A<\/jats:sub> receptor PET as a tool for the assessment of neurodegenerative changes in mild AD.<\/jats:p>","DOI":"10.1002\/syn.22235","type":"journal-article","created":{"date-parts":[[2022,5,19]],"date-time":"2022-05-19T17:17:53Z","timestamp":1652980673000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Decreased 5\u2010HT<sub>1A<\/sub> binding in mild Alzheimer's disease\u2014A positron emission tomography study"],"prefix":"10.1002","volume":"76","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7975-833X","authenticated-orcid":false,"given":"Patrik","family":"Mattsson","sequence":"first","affiliation":[{"name":"Department of Clinical Neuroscience Center for Psychiatry Research, Karolinska Institutet and Stockholm County  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