|Year : 2010 | Volume
| Issue : 4 | Page : 145-147
Role of immunohistochemistry in lymphoma
I Satish Rao
Department of Pathology, Krishna Institute of Medical Sciences, Hyderabad, India
|Date of Web Publication||28-Jan-2011|
I Satish Rao
Department of Pathology, Krishna Institute of Medical Sciences, #1-8-31/1, Minister Road, Hyderabad - 500 003
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Rao I S. Role of immunohistochemistry in lymphoma. Indian J Med Paediatr Oncol 2010;31:145-7
| Introduction|| |
World Health Organization broadly classifies lymphomas into Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL). Non-Hodgkin lymphoma is further subclassified based on the stage of maturation (immature vs. mature) and cell of origin [B cell, T cell, or natural killer cell (NK) cell].
Morphologic assessment takes into account the anatomic architectural alterations in the lymphoid compartment [i.e., B-cell follicle (follicle center, mantle, or marginal zone) or T-cell regions (interfollicular or sinus areas)]. If an abnormal population is present (polymorphic or monomorphic), the determination of pattern (diffuse or nodular) and cell size (small, intermediate, large) and nuclear characteristics (round, irregular, cleaved with condensed or dispersed or blastic chromatin, and the character of the nucleoli) is made.
The unique feature of lymphomas is the fact that these are considered as clonal proliferation of lymphocytes arrested at different stages of differentiation, thereby recapitulating stages of normal lymphocyte differentiation. Immunohistochemistry (IHC) with various antibodies identifies the specific lineage and developmental stage of the lymphoma.
A panel of markers is decided based on morphologic differential diagnosis (no single marker is specific) which includes leukocyte common antigen (LCA), B-cell markers (CD20 and CD79a), T-cell markers (CD3 and CD5) and other markers like CD23, bcl-2, CD10, cyclinD1, CD15, CD30, ALK-1, CD138 (based on cytoarchitectural pattern).
This review addresses the three-pronged role of IHC in the lymphoma - subtyping, prognostication and potential for targeted therapy in commonly encountered nodal lymphomas. A complete knowledge of the type of positivity (membrane, cytoplasmic nuclear) with awareness of associated caveats is essential for the accurate subtyping and distinguishing from reactive processes.
| Role in Subtyping (Morphology with IHC)|| |
The role is given in [Table 1],[Table 2],[Table 3],[Table 4],[Table 5].
| Role in Prognostication|| |
- CD10, BCL6, and MUM1 expression differentiates two distinct prognostic groups of primary nodal DLBCL - Germinal center type longer survival activated type. 
- BCL-2 positivity with MYC translocations in follicular lymphoma - Aggressive course 2
- ALK positive ALCL better prognosis than ALK negative ALCL( 5 yr survival 80%vs 48%) 2
Role in Targeted Therapy|| |
- Rituximab in B-cell lymphomas has a well established role. Murine models being studied in Hodgkin's lymphoma along with CD25 (IL-2 receptor)
- CD22 - IgG 1 antibody (Epratuzumab) in relapsed and refractory, indolent and aggressive NHL ongoing studies evaluating use in conjunction with Rituximab in FL, with CHOP in DLBCL)
- CD30 - Anti CD30 (SGN 30) in Hodgkin's lymphoma and CD30 positive T-cell lymphomas (ongoing phase 2 studies)
- CD40 - Anti CD40 (SGN 40) in recurrent B-cell NHL (ongoing phase 2 studies)
- CD80 - Anti CD80 (Galiximab) in relapsed and refractory FL in conjunction with Rituximab (ongoing phase 2 studies)
In conclusion, judicious use of panel of antibodies in the light of characteristic cytoarchitectural features helps to recognize the characteristic immunophenotype in most of the lymphomas. Successful outcome with Rituximab has created an interest to search for newer monoclonal antibodies as potential therapeutic targets. Better understanding of the pathogenesis of lymphomas has been possible with the help of IHC.
| References|| |
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|2.||Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, et al. WHO classification of tumours of haematopoietic and lymphoid tissues. 4 th ed. 2007, Lyon: IARC; 2008. |
|3.||Bhargava P, Kadin ME. Immunohistology of Hodgkin lymphoma diagnostic immunohistochemistry: Theranostic and genomic applications. In: Dabbs DJ, editor. 3 rd ed. Philadelphia: Saunders Elsevier; 2010. p. 137-55. |
|4.||Elstrom EL, Martin P, Leonard JP. New biologic agents and immunologic strategies, Hematology/Oncology Clinics of North America. Vol. 22. Philadelphia: Saunders Elsevier publishers; 2008. p. 1037-49. |
|5.||Higgins RA, Blankenship JE, Kinney MC. Application of immunohistochemistry in the diagnosis of Non-Hodgkin and Hodgkin lymphoma. Arch Pathol Lab Med 2008;132:441-61 |
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]