 Lymphomas are malignant tumours of the immune system. Lymphomas are classified as Hodgkins or non-Hodgkins lymphomas with several subtypes. In Finland the amount of newly diagnosed Hodgkins lymphomas is 120-150 new cases per year and it accounts for 12 of all lymphomas. Non-Hodgkins lymphoma is the sixth most common cancer in men and the eight most common cancer in women in Finland. There are approximately 1200 new cases per year and the incidence has been increasing during the last decade. 1, 2 