Analysis of normalized CSF levels of APP, Aβ42, sAPPα, sAPPβ, L1CAM, NCAM-1, tau, and pTau across the entire cohort of CHC subjects, ranging in age between 0 and 215 months, demonstrated significant increases in CSF APP, Aβ42, sAPPα, sAPPβ, L1CAM, tau, and pTau in CHC compared with control and OND subjects (Fig 2, Table 2). This evidence concerns the gene L1CAM and cryohydrocytosis.