Thirteen Years Incidence of Colorectal Cancer in Shahroud and Meyami Districts: A Report From a Population-Based Cancer Registry

Background and Objectives: Colorectal cancer is considered as one of the most common cancers in the world and Iran. Epidemiological studies are necessary to evaluate the trend of this disease in society. This study aimed to describe the incidence and trend of colorectal cancer in 13 years in Shahroud and Meyami districts, Iran. Methods: The data were obtained from the population-based cancer registry system at Shahroud University of Medical Sciences, including patients in Shahroud and Meyami districts. The standardized incidence rate (ASR) was calculated based on age and gender, and the 13-year trend from 2010 to 2022 was calculated using joinpoint regression along with the percentage of annual changes. Results: In general, 543 cases of colorectal cancer were recorded from 2010 to 2022, including 280 (51.6%) males and 263 (48.4%) females. The most recorded cases of this cancer were in 2021 with 54 cases. The Age-standardized mean incidence rate of colorectal cancer in this period was 17.6 per 100,000 people. The ASR of colorectal cancer in males and females was 18.4 (95%CI: 16.2 - 20.6) and 16.8 (95% CI: 14.8 - 18.9), respectively. The annual percent change of ASR during the study period was 2.33% (95% CI: 0.13 – 4.87), indicating an increasing trend. Conclusion: In the Shahroud and Meyami districts, the incidence rate of colorectal cancer was 17.6 per 100,000 people and has increased relatively over the 13-year study period.