There are 2 main types of lymphocytes: Lymph nodes: Lymph nodes are bean-sized collections of lymphocytes and other immune system cells. They're found throughout the body, including inside the chest, ...

In CLL, most of the cancer cells are in the blood and bone marrow. In SLL, the cancer cells are mainly in the lymph nodes and spleen. Both CLL and SLL are usually slow-growing (indolent) lymphomas, ...