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Background:The concept of the adolescent and young adult period has only recently emerged. Most important activities in human life, such as attending school, starting work, marrying, and becoming pregnant, are done in this period. It has therefore become usual to think about this group separately from children and adults. However, in Japan, treatment of lymphoma in this group is split between pediatrics and hematology. This results in poor information-sharing and some confusion about who should treat and follow this group. The move from pediatrics to hematology is often not smooth. There is therefore no precise data about lymphoma in this group collected in Japan. Aims: We therefore aimed to clarify the prevalence of lymphoma subtype, outcomes, and long-term adverse events in this group. Methods: We retrospectively analyzed 50 patients aged from 16 to 39 years old, who were diagnosed with lymphoma at

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