IMPACT OF THE POLLUTANTS’ DISCHARGE TO WATER BODIES ON THE GASTRIC CANCER INCIDENCE AMONG THE PERM KRAY POPULATION

The article describes relationship between indicators of the incidence of gastric cancer in the Perm Krai and generalized indicators of pollutants' discharge to surface water bodies. The work uses data from the annual reports of the Perm Kray on the status of cancer care, environmentl status and protection. A correlation between them with a period of 4 years was revealed. The incidence of gastric cancer in the period from 2010 to 2017 correlate with the amount of pollutant discharges into water bodies from 2006 to 2013. The correlation coefficient was r = 0.75 (high correlation). In the study of the relationships, the duration of the latent period of carcinogenesis was taken into account. Analysis of the values of discharges of pollutants with wastewater into water bodies for the period from 2006 to 2013 showed that the number of discharges increased by 2007, then until 2010 a decrease was observed, and then in 2011–2013 there is a tendency to increase the mass of discharges of pollutants. The time relationship of gastric cancer incidence rates with the number of pollutant discharges into water bodies, with an interval T between them equal to 4 years, is graphically shown. A relationship was found between a disease of gastric cancer and the environmental situation (the value of discharges of pollutants into water bodies), that is, the quality of the environment. The incidence is reduced following a decrease in the amount of pollutants discharged into water bodies in the Perm Kray.