Lymphoma is a malignant neoplasm of the immune system and lymph nodes. Men and women aged 50 and above are more likely to develop this disease. With the increase in the frequency of non-Hodgkin’s lymphoma (NHL) during the past decade approximately 50 000 American people are suffering from this illness now. The exact cause of the disease is still unknown but certain viruses like EBV or HIV are responsible for some lymphomas.