Objective: Within oncological diseases, stomach cancer is ranked fourth in Kazakhstan, following breast cancer, cancer of the trachea, bronchi and lungs, and skin cancer. In males, stomach cancer is ranked second, following cancer of the trachea, bronchi and lungs, and amounting to 11.8% from all the localizations. Methods: Descriptive methods of modern oncological epidemiology were used in the present study, which was performed on the total population of Kazakhstan. The calculation of the unadjusted and adjusted rates, and the morbidity structure rates was performed according to all age-gender groups over a 10-year period (between 2004 and 2013).

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IntroductionOver the last 15 years (1999‐2013) more than 42 thousand patients have been registered with stomach cancer (SC) identified for the first time.Materials and methodsIn 2013, screening was introduced in Kazakhstan with the aim of early detection of stomach and esophageal cancers. The target population is persons aged 50‐60 years. Screening by endoscopic examination was conducted in a pilot mode in 4 regions and in Astana and Almaty cities.Results150,546 persons were examined in the targeted age groups.1,649 patients were identified with disorder of gastro‐intestinal tract mucosa (0.9% from examined patients), of whom 1,589 people (96.4%) were registered for medical checkup. Statistically significant differences of endoscopic esophageal and stomach disorders frequency were identified between max (2.8%) and min (0.4%) parameters (p<0.05). The frequency of the disorder was the highest in the age group of 60 years. According to the data of primary medical care the diagnosis of SC was achieved in 87 cases (0.05%). According to the endoscopic examination 79 cases of SC were identified (including 39 morphologically verified). According to the cancer registry, SC detectability is 0.04% from the number of examined patients. Complete agreement between primary medical care and cancer‐register data was observed only in one region. SC is identified more frequently at stage II (47.0%).ConclusionsAccording to the primary medical care and cancer registry data, there is mismatch in the results: almost in all regions both cases of stomach cancer over diagnosis in some regions and misreporting in others.

IntroductionEsophageal cancer and stomach cancer occupy the leading places in the structure of morbidity and mortality not only in Kazakhstan but also around the world.MethodsMorbidity prognosis for esophageal and stomach cancers within the regions of Kazakhstan was conducted on the basis of on the level of morbidity from 1999 to 2013. Correlation analysis was used for estimation. Morbidity prognosis was conducted by fitting time‐series models, constructed on the basis of<a name=“_GoBack”> </a>dynamic series for the observation period and its extrapolation to 2015‐2016. The length of the prognosis period was determined by the quantity of data.ResultsA strong association was found between the level of morbidity with cancer of esophagus and stomach (r=0.76‐0.78), predominantly in southern regions of the country. A moderate positive association was found in western regions; in other regions there was weak/no association of the level of morbidity with cancer of stomach and esophagus (r<0.33). In general the trend of reduction of morbidity with cancer of esophagus and stomach has been noted in in Kazakhstan; however, the nature of reduction of oncological morbidity is different. In the coming years, comparatively high levels of morbidity are expected in northern and eastern regions of the country (with a downward trend), and also in the central region.ConclusionsThe pattern in the level of morbidity of cancer of the esophagus and stomach in general is subject to common social processes law of development – reduction of morbidity level with decrease of reduction rate. The most common function for reflection of dynamics law of oncological morbidity is a logarithmic function.