CYP24A1 expression increased in patients and HC following 1,25(OH)2D3 treatment of IL1β-stimulated monocytes [AD/AITIL1β vs IL1β/1,25(OH)2D3 p = 6x10-5; T1D/AITIL1β vs IL1β/1,25(OH)2D3 p = 6x10-5; HCIL1β vs IL1β/1,25(OH)2D3 p < 10-7]. This evidence concerns the gene IL1B and Alzheimer disease.