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B-cell lymphoma
Micrograph showing a large B cell lymphoma. Field stain.
Specialty	Hematology, oncology

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

1. ^ Merck Manual home edition, Non-Hodgkin Lymphomas
2. Nguyen, Nghi; Khan, Mujahid; Shah, Muhammad (2017). "Primary B-cell lymphoma of the pelvic bone in a young patient: Imaging features of a rare case". Cancer Research Frontiers. 3 (1): 51–55. doi:10.17980/2017.51. ISSN 2328-5249.
3. ^ "The Lymphomas" (PDF). The Leukemia & Lymphoma Society. May 2006. p. 12. Archived from the original (PDF) on 2008-07-06. Retrieved 2008-04-07.
4. Mazen Sanoufa; Mohammad Sami Walid; Talat Parveen (2010). "B-Cell Lymphoma of the Thoracic Spine Presenting with Spinal Cord Pressure Syndrome". Journal of Clinical Medicine Research. 2 (1): 53–54. doi:10.4021/jocmr2010.02.258w. PMC 3299178. PMID 22457704.
5. "HMDS: Hodgkin's Lymphoma". Archived from the original on 4 March 2009. Retrieved 2009-02-01.
6. Mohammad Muhsin Chisti, Haresh Kumar, Sumeet K Yadav. "B-Cell Lymphoma Workup". Medscape.{{cite web}}: CS1 maint: multiple names: authors list (link) Updated Jul 27, 2020
7. Attanoos, Richard (2018). "Lymphoid Malignancies of the Pleura and Peritoneum". Practical Pathology of Serous Membranes. pp. 203–208. doi:10.1017/9781316402009.016. ISBN 9781316402009.
8. Küppers, R; Dalla-Favera, R (10 September 2001). "Mechanisms of chromosomal translocations in B cell lymphomas" (PDF). Oncogene. 20 (40): 5580–94. doi:10.1038/sj.onc.1204640. PMID 11607811. S2CID 10776403.
9. Li JY, Gaillard F, Moreau A, et al. (May 1999). "Detection of translocation t(11;14)(q13;q32) in mantle cell lymphoma by fluorescence in situ hybridization". Am. J. Pathol. 154 (5): 1449–52. doi:10.1016/S0002-9440(10)65399-0. PMC 1866594. PMID 10329598.

External links

• Lymphoma