Blood cancer represents a large number of different malignancies. This group includes
cancers of the bone marrow, blood, and lymphatic system, including cancers of the lymph
nodes, lymph vessels, tonsils, thymus, spleen, and lymphatic tissues of the digestive tract.
Leukemia and myeloma start in the bone marrow, and lymphoma starts in the lymphatic
system and are the most common types of blood cancers