|Written||2016-04||Antonino Carbone, Annunziata Gloghini|
|Department of Pathology Centro di Riferimento Oncologico Aviano (CRO), Istituto Nazionale Tumori, IRCCS, Aviano, Italy; email@example.com (AC); Department of Diagnostic Pathology and Laboratory Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano, Italy; firstname.lastname@example.org (AG)|
|Abstract|| The lymphocyte depletion classical Hodgkin lymphoma (LDCHL) is the less common subtype of cHL.
In LDCHL, Hodgkin and Reed-Sternberg (HRS) cells grow within a background depleted in reactive lymphocytes.
LDCHL subtype accounts for only a small fraction of all HL cases in Western countries. It also occurs in people with HIV/AIDS.
The HRS cells show the same immunophenotype as in the other subtypes of cHL.
|Keywords||Lymphocyte depletion; classical Hodgkin Lymphoma; Hodgkin Lymphoma; LDCHL.|
|ICD-Morpho||9653/3 Lymphocyte-depleted classical Hodgkin lymphoma|
|Other names||Lymphocyte depletion Hodgkin Lymphoma|
|Lymphocyte-depleted classical Hodgkin lymphoma|
|Lymphocyte depletion Hodgkin disease.|
|Clinics and Pathology|
|Disease||Hodgkin Lymphoma (HL) includes classical Hodgkin lymphoma (CHL) which accounts for 95% of all cases (Stein et al. 2008). Lymphocyte depletion classical Hodgkin lymphoma (LDCHL) is the less common subtype of cHL (Benharroch et al., 2008). LDCHL is a subtype of cHL rich in Hodgkin and Reed-Sternberg (HRS) cells. These cells reside within a background depleted in non-neoplastic lymphocytes. In the past few decades, a fraction of these cases have been reclassified into different non-Hodgkin lymphoma entities (Benharroch et al., 2008).|
|Phenotype / cell stem origin||LDCHL involves a clonal expansion of germinal center B-cell derived lymphocytes which mimic those observed in the other subtypes of cHL.|
|Epidemiology|| LDCHL accounts for only a small fraction, less than 1%, of all HL cases in Western countries. There is a male predominance. The median age ranges from 30 to 40 years. LDCHL is often seen in people infected with HIV and more often in developing countries (IARC, 2012). |
People with HIV/AIDS are at increased risk of HL in the highly active antiretroviral therapy era. In HIV-infected people cHL is presently the most common non-AIDS defining cancer (Carbone et al., 2014).
|Clinics||Patients affected by LDCHL present with an advanced stage (III-IV stage) and with B symptoms more often than those affected by the other subtypes. LDCHL usually involves retroperitoneal lymph-nodes and extranodal sites including abdominal organs and bone-marrow (Younes et al., 2014).|
|Pathology|| A consistent feature is the predominance of HRS cells in relation to the cell density of the background. The HRS cells are pleomorphic with a sarcomatous appearance. A proportion of HRS cells may resemble anaplastic forms of tumour cells observed in some large cell non-Hodgkin lymphoma. The background is characterized by diffuse fibrosis and depletion in reactive lymphocytes. |
The HRS cells show the same immunophenotype as in the other subtypes of CHL (Carbone and Gloghini, 2016); the immunophenotype is the following:
|Figure 1. Involvement of lymph node by HIV-associated classic Hodgkin lymphoma (cHL) of the lymphocyte depletion subtype. Large Hodgkin Reed-Sternberg (HRS) cells with multiple nuclei and prominent nucleoli are present. HRS cells express the typical phenotype with intense staining for CD30.|
|Figure 2. Involvement of lymph node by HIV-associated classic Hodgkin lymphoma (cHL) of the lymphocyte depletion subtype. Large Hodgkin Reed-Sternberg (HRS) cells are Epstein-Barr virus-infected as demonstrated by EBER in situ hybridization (brown) with latent membrane protein 1 expression (red).|
|Other features|| Virology|
Tumour tissue is characterized by an unusual large proportion of HRS cells infected by EBV. EBV is found in nearly all cases of LDCHL occurring in patients infected by HIV. EBV infected tumour cells contain LMP1 which can activate critical signaling pathways including NF-kB.
It seems appropriate to mention here that the virologic characteristics of HL vary according to the immunocompetence status of the host and cHL subtype (IARC, 2012; Swerdlow et al., 2008) as follows:
cHL of the general population
- NS cHL, usually EBV negative
- MC cHL, usually EBV positive
- LRCHL, variably EBV positive
- LD cHL, variably EBV positive
- HIV-associated cHL, EBV positive
- Post-transplant cHL, EBV positive
- Iatrogenic (methotrexate), variaby EBV positive
LMP1 expression is observed in virtually all HIV associated LDCHL cases: it suggests that EBV play an etiological role in the pathogenesis of these tumours.
HRS cells are usually seen in a microenvironment where several histiocytoid cells are admixed with few small lymphocytes. These lymphocytes predominantly express the CD3+, CD4+, CD8-/+, CD20- phenotype.
It has been recognized that EBV has the capability to modulate the tumour microenvironment (Dolcetti, 2015; Dolcetti et al., 2016).
|Treatment||The combination of cART with better supportive therapy has made standard ABVD (doxorubicin, bleomycin, vinblastine, dacarbazine), used for LDCHL occurring in the general population, feasible in patients with HIV-associated Hodgkin lymphoma (Carbone et al., 2014).|
|Prognosis|| Most patients affected by LDCHL have a worse prognosis than do patients affected by other cHL subtypes (Younes et al., 2012). |
Poor prognosis have been observed in patients affected by HIV-associated LDCHL. The outcome of HIV-associated cHL has dramatically improved since the introduction of cART with intensive chemotherapy regimens (Carbone et al., 2014).
|Due to the small number of LDCHL cases analysed for genetics/cytogenetics characteristics and to the reclassification of cases into different lymphoma categories, the previously described genetics and cytogenetics findings are not unquestionably acknowledged.|
|To be noted|
| Additional cases are needed to delineate the epidemiology of this rare entity: |
you are welcome to submit a paper to our new Case Report section.
|A Review of Human Carcinogens. Part B: Biological Agents|
|IARC Monograph on the Evaluation of Carcinogenic Risk to Humans. Vol. 100. IARC, Lyon, France, 2012.|
|Lymphocyte-depleted classical Hodgkin lymphoma.|
|Benharroch D, Stein H, Peh S-C.|
|Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele H, Vardiman JW (eds.) World Health Organization Classification of Tumours, Pathology and Genetics of Tumours of Haematopoietic and Lymphoid Tissues, Lyon: IARC Press, 2008: 334|
|Classical Hodgkin lymphoma|
|Carbone A, Gloghini A|
|Atlas Genet Cytogenet Oncol Haematol 2016|
|Diagnosis and management of lymphomas and other cancers in HIV-infected patients.|
|Carbone A, Vaccher E, Gloghini A, Pantanowitz L, Abayomi A, de Paoli P, Franceschi S.|
|Nat Rev Clin Oncol 2014; 11(4): 223-238 (Review).|
|Cross-talk between Epstein-Barr virus and microenvironment in the pathogenesis of lymphomas.|
|Semin Cancer Biol 2015; 34: 58-69.|
|Classical Hodgkin lymphoma, introduction.|
|Stein H, Delsol G, Pileri SA,Weiss LM, Poppema S, Jaffe ES.|
|Swerdlow SH, Campo E, Harris NL, Jaffe ES, Pileri SA, Stein H, Thiele H, Vardiman JW (eds.) World Health Organization Classification of Tumours, Pathology and Genetics of Tumours of Haematopoietic and Lymphoid Tissues, Lyon: IARC Press, 2008: 326-329|
|Younes A, Carbone A, Johnson P, Dabaja B, Ansell S, Kuruvilla L.|
|De Vita VTJ, Lawrrence TS, Rosemberg SA (eds). De Vita, Hellman, and Rosenberg's Cancer: Principles and Practice of Oncology: Wolters Kluwer Health/Lippincott Williams & Wilkins; 2014.|
|This paper should be referenced as such :|
|Carbone A, Gloghini A|
|Lymphocyte depletion classical Hodgkin lymphoma;|
|Atlas Genet Cytogenet Oncol Haematol. in press|
|On line version : http://AtlasGeneticsOncology.org/Anomalies/LymphoDepletClassicHodgkinID1568.html|
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