Lymphosarcoma Incidence in Kazakhstan: A Retrospective Survey (2010-2019)

The aim is to study the trends of lymphosarcoma incidence in the regional context in Kazakhstan.

The retrospective study was done using descriptive method of oncoepidemiology. The extensive, crude and age-specific incidence rates are determined according to the generally accepted methodology used in statistics. The data were used to calculate the average percentage change (APС) using the Joinpoint regression analysis to determine the trend over the study period.

3,987 new cases of lymphosarcoma were registered in the country (50.7% in men, 49.3% in women). During the studied years the average age of patients was 54.2±0.8 years. The highest incidence rates per 100,000 in the entire population were found in the age groups 65-69 years (10.4±0.6), 70-74 years (10.7±0.8), and 75-79 years (10.3±0.8). The highest tendency to increase in age-related incidence rates was at the age over 85 (APC=+8.26) and to decrease at the age under 30 (APC=-6.17). The average annual standardized incidence rate was 2.3 per 100,000, and in dynamics tended to increase (APC=+1.43). It was found that the downward trend was observed in five regions (Akmola, Atyrau, Karaganda, North and South Kazakhstan), and the most pronounced decline was in the Karaganda (APC=-3.61) and South Kazakhstan (APC=-2.93) regions. When compiling thematic maps, incidence rates were determined based on standardized indicators: low - up to 1.97, average - from 1.97 to 2.60, high - above 2.60 per 100,000 for both sexes.

Trends in the incidence of lymphosarcoma in Kazakhstan are growing and have geographical variability, and a high incidence is observed in the eastern and northern regions of the country. Sex differences have been established the incidence in men is higher than in female population, but the rate of increase in the incidence in women is more pronounced.