Antitumor effects of curcumin and oxaliplatin combination on xenografts of human colon cancer LoVo cells in nude mice Effect of Xihuang Capsules in adjuvant treatment of colon cancer patients with liver metastases and on IL-17 and IL-6 in serum of patients Effects of Coptis chinensis and Evodia rutaecarpa water extracton DMH-induced precancerous lesion of colon Preventive effects of berberine on experimental colon cancer and relationship with cyclooxygenase-2 expression