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Assessing tau pathology and relative cerebral blood flow (rCBF) measured with [\n                      <jats:sup>18<\/jats:sup>\n                      F]flortaucipir PET in relation to cognition may help explain these differences between EOAD and LOAD.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Seventy-nine amyloid-positive individuals with a clinical diagnosis of AD (EOAD:\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200935, age-at-PET\u2009=\u200959\u2009\u00b1\u20095, MMSE\u2009=\u200923\u2009\u00b1\u20094; LOAD:\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200944, age-at-PET\u2009=\u200971\u2009\u00b1\u20095, MMSE\u2009=\u200923\u2009\u00b1\u20094) underwent a 130-min dynamic [\n                      <jats:sup>18<\/jats:sup>\n                      F]flortaucipir PET scan and extensive neuropsychological assessment. We extracted binding potentials (BP\n                      <jats:sub>ND<\/jats:sub>\n                      ) and R\n                      <jats:sub>1<\/jats:sub>\n                      (proxy of rCBF) from parametric images using receptor parametric mapping, in medial and lateral temporal, parietal, occipital, and frontal regions-of-interest and used nine neuropsychological tests covering memory, attention, language, and executive functioning. We first examined differences between EOAD and LOAD in BP\n                      <jats:sub>ND<\/jats:sub>\n                      or R\n                      <jats:sub>1<\/jats:sub>\n                      using ANOVA (region-of-interest analysis) and voxel-wise contrasts. Next, we performed linear regression models to test for potential interaction effects between age-at-onset and BP\n                      <jats:sub>ND<\/jats:sub>\n                      \/R\n                      <jats:sub>1<\/jats:sub>\n                      on cognition.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Both region-of-interest and voxel-wise contrasts showed higher [\n                      <jats:sup>18<\/jats:sup>\n                      F]flortaucipir BP\n                      <jats:sub>ND<\/jats:sub>\n                      values across all neocortical regions in EOAD. By contrast, LOAD patients had lower\n                      <jats:italic>R<\/jats:italic>\n                      <jats:sub>1<\/jats:sub>\n                      values (indicative of more reduced rCBF) in medial temporal regions. For both tau and flow in lateral temporal, and occipitoparietal regions, associations with cognitive impairment were stronger in EOAD than in LOAD (EOAD BP\n                      <jats:sub>ND<\/jats:sub>\n                      \u2009\u2212\u20090.76\u2009\u2264\u2009st\u03b2\u2009\u2264\u2009\u2009\u2212\u20090.48 vs LOAD\u2009\u2212\u20090.18\u2009\u2264\u2009st\u03b2\u2009\u2264\u2009\u2009\u2212\u20090.02; EOAD R\n                      <jats:sub>1<\/jats:sub>\n                      0.37\u2009\u2264\u2009st\u03b2\u2009\u2264\u20090.84 vs LOAD\u2009\u2212\u20090.25\u2009\u2264\u2009st\u03b2\u2009\u2264\u20090.16).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Compared to LOAD, the degree of lateral temporal and occipitoparietal tau pathology and relative cerebral blood-flow is more strongly associated with cognition in EOAD.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00259-021-05669-6","type":"journal-article","created":{"date-parts":[[2022,1,7]],"date-time":"2022-01-07T20:02:25Z","timestamp":1641585745000},"page":"1951-1963","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Differential associations between neocortical tau pathology and blood flow with cognitive deficits in early-onset vs late-onset Alzheimer\u2019s disease"],"prefix":"10.1007","volume":"49","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3642-146X","authenticated-orcid":false,"given":"Denise","family":"Visser","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sander C. 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All the funding is paid to the institution. WvdF holds the Pasman chair.Van Berckel received research support from ZonMW, AVID radiopharmaceuticals, CTMM, and Janssen Pharmaceuticals. He is a trainer for Piramal and GE. He receives no personal honoraria.Scheltens received grant support (to the institution) from GE Healthcare, Danone Research, Piramal, and MERCK. In the past 2\u00a0years, he has received consultancy\/speaker fees from Lilly, GE Healthcare, Novartis, Forum, Sanofi, Nutricia, Probiodrug, and EIP Pharma. All the funding is paid to the institution.No other potential conflicts of interest relevant to this article exist.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}