Immunohistochemical and molecular study of epstein–barr virus (EBV)‎ expression in lymphoma and its correlation with age , gender of patients and type of lymphoma in Thi-Qar

الملخص EN

Background : the lymphoid malignancies comprise one of the most diverse and heterogeneous sets of diseases that exist under a single type of malignancy.

In 2012, the American Cancer Society estimated there were about 70,000 cases of non-Hodgkin lymphoma (NHL), and about 10,000 cases of hodgkin lymphoma in the united states, collectively accounting for about 4% to 5% of all cancers.

the estimated number of U.S.

cancer deaths attributed to lymphoma is about 3% for both males and females, ranking it about 8th among all causes of cancer death.

Hodgkin lymphoma typically carries a better prognosis, accounting for approximately 1000 deaths per year.

whereas the lifetime risk of developing any cancer is about 1 in 2 for males and 1 in 3 for females, the lifetime risk of developing non-Hodgkin lymphoma is about 1 in 43 and 1 in 51 for males and females, respectively (for the years between 2006 and 2008).

Since the discovery in 1964 of the Epstein–Barr virus (EBV) in African Burkitt lymphoma, this virus has been associated with a remarkably diverse range of cancer types.

Because EBV persists in the B cells of the asymptomatic host, it can easily be envisaged how it contributes to the development of b-cell lymphomas.

however, EBV is also found in other cancers, including T-cell/natural killer cell lymphomas and several epithelial malignancies.

explaining the etiological role of EBV is challenging, partly because the virus probably contributes differently to each tumour and partly because the available disease models cannot adequately recapitulate the subtle variations in the virus–host balance that exist between the different EBV-associated cancers.

aim of the study :- To assess EBV over expression in lymphoma and its correlation with age , gender of patients and type of lymphoma.

materials and methods : this study was included 93 cases of archival lymphoid tissue, collected randomly from the period of February 2015- April 2017 from Al-imam al-Hussein teaching hospital and some private laboratories in Thi-Qar government .

41 patients of non Hodgkin’s lymphoma (NHL) and 52 patients of Hodgkin’s lymphoma (HL) ,their median age 50.04 years range from (14–70 )years .

a manual LSAB procedure was used in the imunohistochemical (IHC) analysis (DakoCytomation Copenhagen ,Denmark) and polymerase chain reaction (PCR) procedure was used in the molecular analysis (Bioneer company, Korea).

results : IHC analysis of EBV over expression was positive in (17.1%) of NHL and (42.3%) of HL , while PCR analysis of EBV over expression was positive in (31.7%) of NHL and (61.5%) of HL were correlated with age of patients and type of tumor, conclusion: these finding support the role of ebvs in carcinogenesis of lymphoma regarding behavior and aggressiveness.