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A barrier to recruitment for anti-amyloid trials includes the availability of the same amyloid PET radiotracer to multiple treatment centres. The objective of the study is to compare longitudinal rates of change between different amyloid PET radiotracers, particularly Pittsburgh compound B and florbetapir, in Down syndrome and to compare the estimated age at amyloid-positivity derived from these radiotracers. Two hundred thirty-seven adults with Down syndrome from the Trial Ready Cohort-Down syndrome and Alzheimer\u2019s Biomarker Consortium-Down syndrome studies were imaged using T1-weighted MRI and using PET images of Pittsburgh compound B, florbetapir, NAV4694 or flutemetamol to screen for amyloid plaque burden. Currently, Pittsburgh compound B and florbetapir have longitudinal data from these cohorts, while NAV4694 has one individual with longitudinal scans and flutemetamol has no available longitudinal data. Pittsburgh compound B displayed a greater effect size to measure amyloid change compared to florbetapir. NAV4694 and Pittsburgh compound B, which are structurally similar compounds, displayed similar sensitivity to measure longitudinal amyloid increase. The estimated age at amyloid onset showed no significant difference between Pittsburgh compound B, florbetapir, NAV4694 or flutemetamol. The findings suggest that different amyloid PET radiotracers provide consistent estimates of amyloid onset age for adults with Down syndrome. Multicentre studies of Alzheimer\u2019s disease therapeutics can utilize multiple amyloid PET radiotracers to facilitate recruitment; however, these radiotracers have different sensitivity to detect longitudinal change.<\/jats:p>","DOI":"10.1093\/braincomms\/fcaf406","type":"journal-article","created":{"date-parts":[[2025,10,14]],"date-time":"2025-10-14T13:20:53Z","timestamp":1760448053000},"source":"Crossref","is-referenced-by-count":4,"title":["A comparison of multiple amyloid PET radiotracers for Down syndrome clinical trials"],"prefix":"10.1093","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8966-8397","authenticated-orcid":false,"given":"Matthew","family":"Zammit","sequence":"first","affiliation":[{"name":"University of Wisconsin-Madison, Waisman Center , Madison, WI 53705 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julie","family":"Price","sequence":"additional","affiliation":[{"name":"Massachusetts General Hospital\/Harvard 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