Iron is an essential functional element for several biologic processes, such as energy production and intermediate metabolism. However, when in excess, it can be toxic and produce free radicals. As a fundamental element involved in cell metabolism, division and proliferation, iron has been implicated as an important player in cancer development. Iron is thought to promote carcinogenesis through iron-induced oxidative stress, modulation of signaling networks associated with malignancy and by providing selective advantage to rapidly growing tumor cells.