CLL (chronic lymphocytic leukemia) and SLL (small lymphocytic lymphoma) are slow-growing (indolent) subtypes of non-Hodgkin lymphoma (NHL),1 with CLL representing about 1/4 of NHL cases in the US.2 Some physicians consider CLL/SLL to be the same disease, differing in the location of the cancer cells. CLL cancer cells are found mostly in the blood, and bone marrow and SLL cancer cells are found mostly in the lymph nodes and spleen.1
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1. About non-Hodgkin lymphoma. American Cancer Society website. https://www.cancer.org/cancer/non-hodgkin-lymphoma/about/b-cell-lymphoma.html. Accessed October 11, 2018
2. Key statistics for chronic lymphocytic leukemia. American Cancer Society website. https://www.cancer.org/cancer/chronic-lymphocytic-leukemia/about/key-statistics.html. Accessed February 5, 2019.