Nimbolide suppresses CDK4/CDK6 kinase activity. Nimbolide inhibits the NF-κB, Wnt, PI3K-Akt, MAPK, and JAK-STAT signaling pathways. Nimbolide causes apoptosis through the inactivation of NF-κB. Nimbolide is a triterpene derived from the leaves and flowers of neem (Azadirachta indica L).