This study will help researchers learn more about non-Hodgkin's lymphoma and Hodgkin's lymphoma and how it is treated in Kenya. Researchers want to see if having certain viruses like Epstein Barr Virus (EBV), Human Immunodeficiency Virus (HIV), and Kaposi's Sarcoma Herpes Virus (KSHV) affects lymphoma. Patients in Kenya who agree to be in this study will let the resesarchers look at their medical record, follow their normal cancer care, and have blood drawn to look at different proteins and viruses. Researchers would also like to look at part of the original tumor that was taken out of each patient. Some of these samples will be stored at Kenyatta National Hospital and research will be done on them later. This study does not involve any change in treatment, but only allows the study team to follow how a patient in Kenya with lymphoma is treated.