Blood and lymph node cancers can begin in either the lymphatic tissues (as in the case of
lymphoma) or in the bone marrow (as with leukemia and myeloma), and they all are involved
with the uncontrolled growth of white blood cells. There are many subtypes of these cancers,
e.g., chronic lymphocytic leukemia and non-Hodgkin lymphoma. Since there is evidence that
these cancers cluster in families, this study aims to understand how genetics and
environmental exposures contribute to the development of these cancers.
At least 2 living, blood related relatives, affected with a lymphoproliferative disorder.