Non-Hodgkin lymphoma is a cancer of the lymphatic system. There are two types of lymphoma, Hodgkin Lymphoma and Non-Hodgkin Lymphoma. Hodgkin Lymphoma is characterised by the presence of the Reed-Sternberg cell. These cells are not usually found in other types of lymphoma so they are call non-Hodgkin lymphoma. Autologus stem cell therapy is when the patients own stem cells are used to treat the condition. The stem cells are collected from the patient and then stored and frozen. Alternatively, the stem cells originate from a donor, this is the allongenic approach. In this procedure the patient receives high doses of chemotherapy. This will destroy the lymphoma cells and the healthy blood cells in the bone marrow. The stem cells that have previously been collected from the patient themselves (autologus) or from a donor (allogenic), will then be transplanted back into the patient. These healthy stem cells can then develop into new blood cells.