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      The B-cell lymphomas are types of lymphoma affecting B cells. Lymphomas are "blood cancers" in the lymph nodes. They develop more frequently in older adults and in immunocompromised individuals.
      B-cell lymphomas include both Hodgkin's lymphomas and most non-Hodgkin lymphomas. They are typically divided into low and high grade, typically corresponding to indolent (slow-growing) lymphomas and aggressive lymphomas, respectively. As a generalisation, indolent lymphomas respond to treatment and are kept under control (in remission) with long-term survival of many years, but are not cured. Aggressive lymphomas usually require intensive treatments, with some having a good prospect for a permanent cure.
      Prognosis and treatment depends on the specific type of lymphoma as well as the stage and grade. Treatment includes radiation and chemotherapy. Early-stage indolent B-cell lymphomas can often be treated with radiation alone, with long-term non-recurrence. Early-stage aggressive disease is treated with chemotherapy and often radiation, with a 70–90% cure rate. Late-stage indolent lymphomas are sometimes left untreated and monitored until they progress. Late-stage aggressive disease is treated with chemotherapy, with cure rates of over 70%.


      Types



      There are numerous kinds of lymphomas involving B cells. The most commonly used classification system is the WHO classification, a convergence of more than one, older classification systems.


      = Common

      =
      Five account for nearly three out of four patients with non-Hodgkin lymphoma:

      Diffuse large B-cell lymphoma (DLBCL)
      Follicular lymphoma
      Marginal zone B-cell lymphoma (MZL) or mucosa-associated lymphatic tissue lymphoma (MALT)
      Small lymphocytic lymphoma (SLL, also known as chronic lymphocytic leukemia, CLL)
      Mantle cell lymphoma (MCL)


      = Rare

      =
      The remaining forms are much less common:

      DLBCL variants or sub-types of
      Primary mediastinal B-cell lymphoma
      T cell/histiocyte-rich large B-cell lymphoma
      Primary cutaneous diffuse large B-cell lymphoma, leg type (Primary cutaneous DLBCL, leg type)
      EBV positive diffuse large B-cell lymphoma of the elderly
      Diffuse large B-cell lymphoma associated with chronic inflammation
      Fibrin-associated diffuse large B-cell lymphoma
      Primary testicular diffuse large B-cell lymphoma
      Burkitt's lymphoma
      Lymphoplasmacytic lymphoma, which may manifest as Waldenström's macroglobulinemia
      Nodal marginal zone B cell lymphoma (NMZL)
      Splenic marginal zone lymphoma (SMZL)
      Intravascular lymphomas variants
      Intravascular large B-cell lymphoma
      Intravascular NK-cell lymphoma
      Intravascular T-cell lymphoma
      Primary effusion lymphoma
      Lymphomatoid granulomatosis
      Primary central nervous system lymphoma
      ALK+ large B-cell lymphoma
      Plasmablastic lymphoma
      Large B-cell lymphoma arising in HHV8-associated multicentric Castleman's disease
      B-cell lymphoma, unclassifiable with features intermediate between diffuse large B-cell lymphoma and Burkitt lymphoma
      B-cell lymphoma, unclassifiable with features intermediate between diffuse large B-cell lymphoma and classical Hodgkin lymphoma


      = Other

      =
      Additionally, some researchers separate out lymphomas that appear to result from other immune system disorders, such as AIDS-related lymphoma.
      Classic Hodgkin's lymphoma and nodular lymphocyte predominant Hodgkin's lymphoma are now considered forms of B-cell lymphoma.


      Diagnosis


      When a person appears to have a B-cell lymphoma, the main components of a workup (for determining the appropriate therapy and the person's prognosis) are:

      Establishing the precise subtype: Initially, an incisional or excisional biopsy is preferred. A core needle biopsy is discouraged except in case a lymph node is not easily accessible. Fine-needle aspiration is only acceptable in selected circumstances, in combination with immunohistochemistry and flow cytometry.
      Determining the extent of the disease (localized or advanced; nodal or extranodal)
      The person's general health status.


      Associated chromosomal translocations


      Chromosomal translocations involving the immunoglobulin heavy locus is a classic cytogenetic abnormality for many B-cell lymphomas, including follicular lymphoma, mantle cell lymphoma and Burkitt's lymphoma. In these cases, the immunoglobulin heavy locus forms a fusion protein with another protein that has pro-proliferative or anti-apoptotic abilities. The enhancer element of the immunoglobulin heavy locus, which normally functions to make B cells produce massive production of antibodies, now induces massive transcription of the fusion protein, resulting in excessive pro-proliferative or anti-apoptotic effects on the B cells containing the fusion protein.
      In Burkitt's lymphoma and mantle cell lymphoma, the other protein in the fusion is c-myc (on chromosome 8) and cyclin D1 (on chromosome 11), respectively, which gives the fusion protein pro-proliferative ability. In follicular lymphoma, the fused protein is
      Bcl-2 (on chromosome 18), which gives the fusion protein anti-apoptotic abilities.


      See also


      Richter's transformation
      T-cell lymphoma


      References




      External links

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    B-Cell Lymphoma: Symptoms, Treatment & Prognosis

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