"Besides being related to bad eating habits, environment and other factors, the occurrence of gastric cancer among Chinese youth is also correlated with heredity to a certain extent." This conclusion was reached by Professor Ren Jun, etc., who is an expert from Xijing Hospital of the Fourth Military Medical University and a member of the International Collaborative Group on Hereditary Gastric Cancer, in a research sponsored by the Fund for Distinguished Teachers in Higher Education Institutions under the Ministry of Education finished recently.