JSH guideline for tumors of hematopoietic and lymphoid tissues—leukemia: 3. Acute lymphoblastic leukemia/lymphoblastic lymphoma (ALL/LBL)
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Acute leukemia and malignant lymphoma were once believed to be malignancies originating in the bone marrow and lymph nodes, respectively. Patients with lymphoblasts in the bone marrow were considered to have acute lymphoblastic leukemia (ALL), and patients without bone marrow involvement were considered to have lymphoblastic leukemia (LBL).