Beta-lapachone (β-lap) is a quinone derived from the bark of South American Lapacho tree (Handroanthus impetiginosus) that exerts specific anti-tumour effects by capitalising on the increased concentration of NAD(P)H:quinone oxidoreductase 1 (NQO1) in cancer cells vs. normal cells. Here, NQO1 is linked to neoplasm.