Prevalence and cumulative 5-year incidence of chronic lymphocytic leukemia in the adult population in the Russian Federation and Ukraine: Data from the LEUKOSPECT study

Abstract

Objectives: LEUKOSPECT was a retrospective, multicenter, epidemiologic study carried out in Russia and Ukraine, aiming to assess the prevalence and cumulative 5-year incidence of chronic lymphocytic leukemia (CLL) in the adult population.Methods: All data were collected manually from patient medical records at each of the study sites and from official censuses. CLL prevalence and incidence were determined from a count of CLL cases (previously diagnosed and new cases) in the population who made at least one clinic visit for CLL during the period from 1 January 2009 to 31 December 2013.Results: The recorded cumulative 5-year incidence of CLL during the study ranged from 1.46 per 100 000 persons (95% CI: 0.85–2.34) in Yekaterinburg, Russia, to 4.34 per 100 000 persons (95% CI: 2.48–7.04) in Luhansk, Ukraine. In 2013, the lowest prevalence of CLL was also recorded in Yekaterinburg: 7.11 per 100 000 persons (95% CI: 5.67–8.81). This was approximately 3.1 times lower than in Luhansk (21.92 per 100 000 population; 95% CI: 17.38–27.28).Conclusion: The results of this study show diverse CLL incidence and prevalence patterns in the adult population of the Russian Federation and Ukraine. Authors propose a more comprehensive study with large region involvement to provide a more precise description of the incidence and prevalence of CLL in Eastern European countries and to better understand disparities reported versus the USA and other Western countries.