A meta-analysis performed by Król-Grzymała et al. (2022) explored published results of differences in tear biomarkers between patients with MS, PD and AD.101 Biomarkers of AD included lipocalin-1, lysozyme-C, lacritin, amyloid proteins, t-Tau, and p-Tau. This evidence concerns the gene LCN1 and myeloid sarcoma.