Some [1,2,3]triazolo [4,5-d]- and [1,2,3]triazolo [4,5-a]pyrimidines, variously substituted with arylthiol, arylamino, thiourea, thiosemicarbazide, and hydrazine moieties, displayed a non-covalent LSD1 inhibition at micromolar/submicromolar level, and inhibited proliferation of a panel of cancer cells at low micromolar doses (Li et al., 2017) (Li Z. et al., 2019) (Wang et al., 2017) (Wang et al., 2019) (Li et al., 2019c). Here, KDM1A is linked to cancer.