Those biomarkers include inflammatory proteins, such as interleukin (IL)-6 and C-reactive protein (CRP)6,31,32, Alzheimer disease (AD) pathology markers6 and markers of neuronal injury, such as the neurofilament light chain (NEFL)9 and glial fibrillary acidic protein (GFAP)8. Here, NEFL is linked to Alzheimer disease.