GSK-2879552 is a selective and potent inhibitor of Lysine-specific demethylase 1 (LSD1, KDM1A), with the potential to treat Small cell lung cancer (SCLC). It induces the expression of putative KDM1A target genes and demonstrates potent, predominantly cytostatic, antiproliferative activity in SCLC cell lines and tumor xenograft models.