TY - CHAP M1 - Book, Section TI - Pathology of Lymphomas A1 - Gascoyne, Randy D. A1 - Skinnider, Brian F. A2 - Press, Oliver W. A2 - Lichtman, Marshall A. A2 - Leonard, John P. Y1 - 2017 N1 - T2 - Williams Hematology Malignant Lymphoid Diseases AB - SUMMARYThe World Health Organization (WHO) classification of lymphoid neoplasms has gained worldwide acceptance by both pathologists and oncologists. As further advances in the classification of lymphoma are agreed upon, the WHO provides an updated version of its classification. The most recent modification was published in 2016. It provides a list of distinct lymphocytic neoplasms that are defined by a combination of morphologic, immunophenotypic, genetic, and clinical features and correlates each disease with a cell of origin in the lymphopoietic hierarchy. Because the classification of lymphomas requires the integration of such diverse information, the diagnosis of specific lymphomas has become more complex compared to other malignancies. As a result, several ancillary studies have become essential in the diagnosis of a specific pathological type of lymphoma, requiring special handling of biopsy material when a diagnosis of lymphoma is suspected. The WHO classification identifies three major categories of lymphoid malignancies: B-cell neoplasms, T- and natural-killer (NK) cell neoplasms, and Hodgkin lymphoma. Two major categories are identified within the B-cell and T-/NK-cell neoplasms: precursor neoplasms and peripheral or mature neoplasms. Unlike previous lymphoma classifications, the WHO classification does not group different lymphomas by clinical outcome or histologic grade. It recognizes that each disease has distinctive clinical features and response to treatment and may have a spectrum of rate of clinical progression that may correlate with histologic grade or gene expression patterns. New approaches for classifying lymphoma include the study of gene expression profiling by complementary DNA microarray technology, which provides additional insights into the subclassification of diseases such as diffuse large B-cell lymphoma and chronic lymphocytic leukemia. Proteomic approaches will add further texture to the molecular taxonomy of lymphoma classification. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/23 UR - hemonc.mhmedical.com/content.aspx?aid=1148368305 ER -