Incidence, prevalence, mortality, and causes of death in Waldenstrom macroglobulinemia: a nationwide, population-based cohort study

BackgroundThe epidemiological features of Waldenstrom macroglobulinemia (WM) have seldom been investigated at a national level, particularly in East Asia. The goal of our study is to present the incidence, prevalence, mortality, survival with competing risks, and causes of death of patients with WM.MethodsWe used a national population-based database, operated by the Health Insurance Review and Assessment Service of the Korean government. This data includes information on all WM patients diagnosed according to uniform criteria, between 2003 and 2016.ResultsThe total number of patients newly diagnosed with WM during the study period was 427, with a male-to-female ratio of 3.2:1. The incidence increased from 0.03 to 0.10 per 10(5) between 2003 and 2016, and the prevalence was 0.42 per 10(5) in 2016. A total of 217 patients with WM died during the study period (standardized mortality ratio=7.57), and the overall survival (OS) of WM patients was 47.5%. On multivariate analysis, older age was associated with worse OS (P< 0.0001). WM was the most common cause of death (n=102, 48.6%), followed by other malignant neoplasms (n=82, 39.0%).ConclusionsThe national incidence of WM in Korea, a racially homogeneous country in Asia, was lower than that in previous reports from other countries, reflecting ethnic disparities. However, the incidence increased, and mortality was the highest ever reported. The main cause of death was WM in itself. This study reflects the need for greater awareness of WM, particularly in Asian countries.