Apart from applications in the field of oncology, LSD1 inhibitors ORY-1001, GSK-2879552, IMG-7289, ORY-2001 (dual LSD1/MAO-B inhibitor) also show therapeutic potentials in clinical investigation to treat MDS, myelofibrosis, multiple sclerosis (MS), and Alzheimer’s disease (AD) (Table 1). This evidence concerns the gene MAOB and early-onset autosomal dominant Alzheimer disease.