NEFL and early-onset autosomal dominant Alzheimer disease: In the present study, we evaluated how plasma p‐tau181, GFAP, and a marker of neurodegeneration (neurofilament light chain; NfL) differed by clinical diagnosis and related to Aβ‐PET in Hispanic and non‐Hispanic older adults from the 1Florida Alzheimer's Disease Research Center (1FLADRC).