MAPT and Alzheimer disease: One of these tracers, 18F-AV-1451 (formerly called 18F-T8072,3), binds to tau aggregates in AD4 and differentiates AD from controls.5, –, 9 Preliminary evidence indicates that CSF tau and PET tau measures correlate,6,10 but those results stem from populations mainly consisting of controls, including few cases with AD dementia.