The morbidity and mortality of disease vary according to the region and may also change over time. The morbidity and mortality of malignant lymphoma are also affected by differences in ethnicity, lifestyle habits, geographical area, and time period. Increasing research on malignant lymphoma has focused on its pathophysiology, diagnosis, and therapeutic treatment. Recent improvements in the accuracy of clinical study, technologies such as next-generation sequencing, and the development of targeted molecular agents have also resulted in a number of excellent studies. This review summarizes the epidemiology of malignant lymphoma and highlights novel studies on adult T-cell leukemia/lymphoma recently published in Japan.
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