VDR and Alzheimer disease: It has been found that patients with positive biomarkers of AD have low 25(OH)D levels in cerebrospinal fluid, but not in the serum, and that CSF levels of 25(OH)D were not related to any of the polymorphisms of the VDR gene: FokI, BsmI, ApaI and TaqI (Soares et al. (2022)) [157].