Other important ginseng saponins with unique chemopreventive actions include Rb2 which may partly contribute to the inhibition of lung tumor metastasis by arresting tumor-associated angiogenesis [15], and Rp1 (a semisynthesized derivative of ginsenoside Rg5) whose anticancer effect is believed to be achieved by strongly inhibiting tumor cell metastasis and viability, presumably through impeding adhesion and vessel formation [16]. This evidence concerns the gene RBL2 and neoplasm.