Impact Of Geographical Environment On Gastric Cancer In Qingzhou City,Shandong Provence

This paper studyed statistics of the first time hospital medical records of gastric cancer from2006to2010, which from Yidu Central Hospital and Qingzhou City People’s Hospital,in Qingzhou City,Shandong Province.Basing on geographical surveys, sample collection and laboratory analysis and using software as Excel2003、ArcGIS、 ArcView、 Geoda、SPSS,and so on,this paper used spatial autocorrelation analysis, multiple linear stepwise regression (Stepwise) and the Kriging method, to study the demographic characteristics and the spatial distribution of gastric cancer in Qingzhou City, the correlation between gastric cancer incidence rate and the average elevation of township, the correlation between the number of gastric cancer in each month and various climate indicators, and cultivated soils geochemical behavior and organic carbon of the impact on gastric cancer. All of this studies is to investigate the influence of geographical factors on the gastric cancer in Qingzhou City.The main conclusions are as follows:(1)The incidence rate of gastric cancer in Qingzhou was25.33/105, standardized incidence rate was23.76/105;the male incidence rate was36.04/105, standardized incidence rate was34.40/105; the female incidence rate was14.49/105,standardized incidence rate of13.35/105.All of this were higher than the incidence of gastric cancer in China.(2)Analysis from the global spatial autocorrelation of Qingzhou5-year average annual incidence showed that.The Moran’S I index of gastric cancer incidence rate was0.342381, and the corresponding Z value was2.68808. There was a significant positive global spatial autocorrelation features of Qingzhou gastric cancer incidence, which also appearing significant local spatial clustering phenomena, showing decreasing trend southwest to northeast on the whole. (3)The terrain and geological conditions had impact on incidence of gastric cancer,in Qingzhou City.The Pearson coefficient between gastric cancer incidence rate in township of Qingzhou and average elevation of township was0.636, the confidence level of significant correlation (bilateral) was0.01.The average incidence rate of gastric cancer of the townships,whose average altitude greater than200m,was29.74/105,which was much higher than regional average incidence.While the average incidence rate of the townships,whose average altitude less than200m, just was22.07/105, which was lower than regional average incidence.Six of seven townships that located in the Cambrian and Ordovician limestone area in Qingzhou City, had much higher gastric cancer incidence than the regional average, whose average incidence rate was30.16/105. The townships located in the Quaternary Sandy gravel and Sandy Loam area,whose average incidence is21.06/105, which was lower than the regional average. Zhengmu town located in the Tertiary basalt area, whose gastric cancer incidence rate of24.89/105,slightly higher than the regional average.(4)The area of lowest regions incidence of gastric cancer was the same of the distribution of aquic soil, in Qingzhou City.(5)Multiple linear regression analysis told that:after Th, Fe two elements entered into the regression model, Fe was positively correlated with gastric cancer incidence, while Th was negatively correlated with gastric cancer incidence. In the spatial distribution, Fe elements present decrease from southwest to northeast trend, while Th elements present increase.Thus we can inferr that, Fe is a induced element of Qingzhou gastric cancer, but Th is a protection element.