Moreover, several anticancer agents including NSAIDs and GT-094 (a NO-NSAID), curcumin, betulinic acid and synthetic triterpenoids, and arsenic trioxide decrease expression of Sp1, Sp3, Sp4 and Sp-regulated genes in cancer cells and these effects contribute to their anticancer activity [17], [18], [20], [35]. Here, SP1 is linked to cancer.