Myeloma or multiple myeloma refers to hematological malignancies - malignant tumors of blood cells. In multiple myeloma tumor in the process involves plasma cells, which are part of the immune system, namely B-limotsity. Tumor development occurs in the bone marrow from the cancer cells spread throughout the body. Significantly the cause of multiple myeloma is not installed. As with other types of Leukemia, has a value of ionizing radiation, pollution and contact with carcinogens, especially with oil and refinery intermediates.