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Hematopoietic and Lymphoid Cell Neoplasm
Definition 1
A neoplasm arising from hematopoietic cells found in the bone marrow, peripheral blood, lymph nodes and spleen (organs of the hematopoietic system). Hematopoietic cell neoplasms can also involve other anatomic sites (e.g. central nervous system, gastrointestinal tract), either by metastasis, direct tumor infiltration, or neoplastic transformation of extranodal lymphoid tissues. The commonest forms are the various types of leukemia, Hodgkin and non-Hodgkin lymphomas, and myelodysplastic syndromes. (NCI Thesaurus)
Definition 2
A cancer of the blood or bone marrow, such as leukemia or lymphoma. (NCI Dictionary)
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