Furthermore, 20 μM DHEC caused the accumulation of APP-CTFs and led to ~35% reduction in total Aβ (Fig. 1b; Supplementary Fig. S2b) in fibroblast cells from an Alzheimer’s disease patient carrying a missense mutation (A246E) in the presenilin 1 (PS1) gene. This evidence concerns the gene PSEN1 and early-onset autosomal dominant Alzheimer disease.