Lymphoid leukemia (or lymphocytic leukemia) is a type of leukemia affecting circulating cells of lymphoid origin. This is in contrast to lymphoma, which is a solid tumor of lymphoid cells.[1] ClassificationHistorically, they have been most commonly divided by the stage of maturation at which the clonal (neoplastic) lymphoid population stopped maturing: However, the influential WHO Classification (published in 2001) emphasized a greater emphasis on cell lineage. To this end, lymphoid leukemias can also be divided by the type of cells affected: References
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