A juice containing tomato extract and soy protein with potential chemopreventive and antiproliferative activities. Tomato-soy juice contains phytochemicals, including flavonoids, such as the soy isoflavone genistein, and carotenoids, including lycopene. These phytochemicals may exhibit antioxidative activity, antitumor activity by modulating certain tumor-associated signal transduction pathways, and apoptosis-inducing activity. Check foractive clinical trials using this agent.