Correspondence to Kaichun Wu, PhD, doctor tutor, professor of State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University; Address: Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, Postcode: 710032; Tel.: 029-83375229; Fax: 029-82539041; E-mail: Hanyu2004@fmmu.edu.cn. Shanshan Cao, Medical Master in Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University; Main research fields: molecule mechanism and therapy in vasculature of gastric cancer.