“…The development of drugs that specifically target tumor cells, but not normal cells, represents a common goal. Natural compounds contain various types of medicinal ingredients, including vitamin derivatives, phenolic and flavonoid agents, organic sulfur compounds, isothiocyanates, curcumins, fatty acids and D-limonene (Amin et al, 2009;Gullett et al, 2010;Tsuda et al, 2004), and sufficient evidences have demonstrated that these components can substantially inhibit tumor formation (Amin et al, 2009).…”