Abstract: Objective To analyze the death distribution and trend of gastric cancer among residents in Dalian City from 2012 to 2022,provide policy reference and evaluation indicators for the comprehensive prevention and control of gastric cancer in Dalian City. Methods The monitoring data on causes of death from gastric cancer among residents in Dalian City from 2012 to 2022 were collected,and the statistical analysis was conducted on the mortality trend of gastric cancer using indicators such as standardized mortality rate,crude mortality rate,proportion of tumor causes of death,and annual percentage change（APC）. Results The standardized mortality rate（standardized mortality rate of China in 2010,hereafter referred to asstandardized mortality rate） of residents in Dalian City from 2012 to 2022 was 14.58/100 000（11.55/100 000-17.47/100 000）,showing a downward trend with increasing years,and the difference was statistically significant（APC=-3.729,t=29.549,P<0.05）.The crude mortality rate of gastric cancer was 25.51/100 000（23.65/100 000-27.219/100 000）,showing a downward trend with increasing years,and the difference was not statistically significant（APC=-0.795,t=2.192,P>0.05）.The proportion of gastric cancer as a cause of tumor death was 11.01%（9.60%-12.42%）,showing a downward trend with increasing years,and the difference was statistically significant（APC=-2.274,t=9.458,P<0.05）.The crude mortality rate andstandardized mortality rate of gastric cancer in female residents from 2012 to 2022 was 14.96/100 000（14.32/100 000-15.90/100 000） and 8.28/100 000（6.79/100 000-9.72/100 000） respectively,while those in male residents was 36.21/100 000（33.73/100 000-38.53/100 000） and 21.38/100 000（16.78/100 000-25.68/100 000） respectively,and the mortality rates of females were lower than those of males（crude mortality rate χ²=2 902.526,standardized mortality rate χ²=347.128,both P<0.05）.The standardized mortality rate of males and females decreased with the increase of year,and the differences were statistically significant（female APC=-3.149,t=6.589,P<0.05;male APC=-3.921,t=8.329,P<0.05）,while the crude mortality rate of males and females decreased with the increase of year,but the differences were not statistically significant（both P>0.05）.The mortality rate of residents in Dalian City increased with age,and the difference was statistically significant（χ²=44 952.256,P<0.05）,the mortality rate in ≥85 age group was the highest,and there was no death of gastric cancer in <20 age group.The proportion of people ≥60 years old increased with the increase of years,and the difference was statistically significant（APC=8.872,t=150.938,P<0.05）. Conclusions The overall mortality rate of gastric cancer among residents in Dalian City shows a decreasing trend. The mortality rate of females is lower than that of males. The mortality rategradually increases with age,and the proportion of tumor composition shows a decreasing trend. The standardized mortality rate shows a decreasing trend. The increase in the proportion of elderly population masks the extent of the decrease in crude mortality rate in the city.Meanwhile,the increase in the proportion of elderly population will increase the absolute number of deaths from gastric cancer,indicating the need to improve the level and scope of early screening,diagnosis and treatment of gastric cancer,and strengthen comprehensive intervention,so as to further reduce mortality of gastric cancer in Dalian City.

Key words: Gastric cancer, Crude mortality rate, Standardized mortality rate, Annual percent change