Hematologic cancers include cancer of the blood, bone marrow and lymph nodes. Each year in the United States, more than 100,000 cases of blood, bone marrow and lymph node cancers are diagnosed.
Bone marrow is the soft sponge-like tissue in the center of bones that produces white blood cells, red blood cells and platelets (disk-shaped structures that help blood to clot). Lymph nodes are small masses of tissue that form the immune system. Scattered throughout the body, they act as filters and immune monitors.
The three most common hematologic cancers are: