Objective: The aim is to study the trends of lymphosarcoma incidence in the regional context in Kazakhstan. Methods: 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. Results: 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. Conclusion: 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.
Relevance: Positron emission tomography combined with computed tomography (PET/CT) is a young and promising technique for lymphoproliferative diseases’ primary detection, staging, and evaluation of the treatment results. However, at this stage of nuclear medicine development, some shortcomings in PET/CT diagnostics of lymphomas using 18Fluorodeoxyglucose (F18-FDG) affect its reliability to a certain extent. The study aimed to evaluate the physical and technical weaknesses of F18-FDG PET/CT in diagnosing lymphomas and review the analytical methods that affect opinion accuracy. Methods: The articles on the use of F18-FDG PET/CT in diagnosing lymphomas, its reliability, and methods for optimizing were searched in the PUBMED database for 2012-2022. Results: One of the main shortcomings of F18-FDG PET/CT in diagnosing lymphomas is the Deauville 5-point scale, which does not fully meet clinical requirements. This scale has some disadvantages, including low inter-reader agreement and an unreliable reference organ for F18-FDG accumulation. Mathematical algorithms for correction to the patient’s weight also require optimization. Conclusion: Some of the existing deficiencies can be improved at the software level and through educating staff about the importance of changing the SUV calculation method. However, other deficiencies, such as classifications that do not meet clinical requirements, require more efforts at the level of international experts and much more in-depth study of this issue to avoid such shortcomings of new staging methods. However, even considering all the shortcomings described, at the moment, PET/CT with F18-FDG is one of the most reliable modalities available, both for the initial detection and for evaluating the therapy effectiveness in patients with lymphomas.
Relevance: Positron emission tomography combined with computed tomography (PET/CT) is a young and promising technique for lymphoproliferative diseases’ primary detection, staging, and evaluation of the treatment results. However, at this stage of nuclear medicine development, some shortcomings in PET/CT diagnostics of lymphomas using 18Fluorodeoxyglucose (F18-FDG) affect its reliability to a certain extent. The study aimed to evaluate the physical and technical weaknesses of F18-FDG PET/CT in diagnosing lymphomas and review the analytical methods that affect opinion accuracy. Methods: The articles on the use of F18-FDG PET/CT in diagnosing lymphomas, its reliability, and methods for optimizing were searched in the PUBMED database for 2012-2022. Results: One of the main shortcomings of F18-FDG PET/CT in diagnosing lymphomas is the Deauville 5-point scale, which does not fully meet clinical requirements. This scale has some disadvantages, including low inter-reader agreement and an unreliable reference organ for F18-FDG accumulation. Mathematical algorithms for correction to the patient’s weight also require optimization. Conclusion: Some of the existing deficiencies can be improved at the software level and through educating staff about the importance of changing the SUV calculation method. However, other deficiencies, such as classifications that do not meet clinical requirements, require more efforts at the level of international experts and much more in-depth study of this issue to avoid such shortcomings of new staging methods. However, even considering all the shortcomings described, at the moment, PET/CT with F18-FDG is one of the most reliable modalities available, both for the initial detection and for evaluating the therapy effectiveness in patients with lymphomas.
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