“Leukemia, lymphoma and multiple myeloma are cancers of the blood, bone marrow or lymph (clear fluid that circulates white blood cells throughout the body). Unlike most types of cancer which form solid masses of abnormal cells called tumors, blood cancers cause the uncontrolled growth of mutated disease-fighting cells, making it harder for the body to fend off infection.

• Leukemia begins in bone marrow, producing abnormal leukocytes (white blood cells).
• Lymphoma (Hodgkin and non-Hodgkin) produces abnormal lymphocytes, immune system cells in the bone marrow, thymus, spleen and other organs.
• Multiple myeloma develops in bone marrow, producing abnormal plasma cells.”

Temple Health (https://www.templehealth.org/services/conditions/leukemia-lymphoma-multiple-myeloma)