Population characteristics of colorectal cancer in the Ulyanovsk region according to the regional cancer register

Aim: to analyze the structure and changes of colorectal cancer (CRC) epidemiology in the Ulyanovsk region in 2005–2019 according to the regional cancer register.

Materials and methods: the study is based on statistical data on the primary detection of CRC in the districts of the Ulyanovsk region (form No. 7) in 2005–2019. Standardized rates of morbidity and mortality were evaluated. Data on the number, gender and age of the regional population were obtained in Ulyanovsk State Statistics Service.

Results: the incidence of CRC in the region increased by 1.51 times over the analyzed period (from 31.12 to 49.58 per 100 thousand people). From the total number of newly diagnosed CRC in 2019, the urban population was 25%, and the rural population — 75%. The incidence rates in the districts of the region were assessed. The highest morbidity in males was detected at the age of 60–64 years old, and it was 1.58 times higher than in females. In the adult population under 30 years old, only few cases of colorectal cancer were detected. The main histological type of tumors was adenocarcinoma. Poorly differentiated tumors accounted for about 3%. The highest age-standardized rates for rectal tumors were 10.1 and 12.8 per 100 thousand people in 2005 and 2019, respectively; for the recto sigmoid tumors — 0.9 and 2.3 per 100 thousand people; and for the anal cancer — 0.4 cases per 100 thousand people in 2019. The male/female ratio of deaths from CRC in 2019 was 1.005:1.000.

Conclusion: there has been a trend to an increase in the incidence of colorectal cancer among the Ulyanovsk region population in the period from 2005 to 2019. We identified some areas of the region that significantly differ in the incidence of colorectal cancer.

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