Background: this study aimed to examine the completeness of the sources of gastric cancer registration and estimate the incidence of gastric cancer using population-based cancer registry data in Ardabil province.
Methods: All diagnosed cases of gastric cancer from the years 2014-2016, recorded in three sources-pathology reports, death certificates, and hospital records-were included in the study. To eliminate duplicate cases, variables such as first name, last name, national ID number, age, gender, date of birth, father's name, and city of residence were used. For estimating the incidence rate, the three-source capture-recapture method and log-linear models were applied.
Results: The incidence based on reported cases by three sources in the years 2014, 2015, and 2016 was 36, 35, and 43 respectively, totaling 99 per 100,000 people (33% women and 66% men). Based on estimated cases, the incidence per year was 85, 63, and 92 cases, totaling 141 per 100,000 people (in men and women, 179 and 100 per 100,000, respectively). The highest sensitivity was related to the pathology source (observed 69.1%, estimated 48.5%), and the lowest was related to the hospital source (observed 18.2%, estimated 12.8%).
Conclusion: The incidence of gastric cancer in Ardabil province was 99 per 100,000 people based on reported cases and 141 per 100,000 people based on estimated cases. The pathology source had the highest sensitivity, while the hospital source had the lowest sensitivity.
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