Level of tumor markers in the population of Southern Yakutia consuming untreated and filtered water

The level of tumor markers was assessed in working-age residents of the Aldan district who consume untreated and filtered water. The average level of tumor markers varied within the normal range. Residents of the city of Aldan who consume unpurified water have shown an increase in the average level of cancer embryonic antigen and carbohydrate antigen Ca19-9 compared to other groups. This group also has a high proportion of individuals with elevated levels of carbohydrate antigen Ca15-3, cancer embryonic antigen, and among women, carbohydrate antigen CA-125. Among individuals who consume filtered water, there is a high proportion of individuals with elevated levels of alpha-fetoprotein, which is more commonly found among residents of the city of Tommot, indicating a need for more in-depth study.