ABSTRACT: Plants derived compounds have been successfully used as anti-cancer medicine so far. Paclitaxel, pomiferin, roscovitine are the few examples of plant derived drugs. There are a number of plant constituents which are being studied for their anticancer activity and still there are a number of natural products that are under various stages of clinical trial. Many researchers are working on these compounds so as to find out their mode of action and selectivity of cancer cell line. Exhaustive work is being done to get promising anti-cancer agents in future. In the present review, naturally occurring flavonoids have been considered and their role in controlling cancer is being investigated. A study of their mode of actions and categorization of their molecular targets have been done.