Myeloma is a form of cancer that rises from white blood cells called B lymphocytes. The disease usually causes malignant cells to grow within bone marrow. These cells interfere with marrow function as well as the immune system. Risk for myeloma has been linked to old age, being overweight, and environmental factors such as radiation exposure. Myeloma draws upon the most current medical research to explain the biology of this form of cancer, how it is diagnosed, and how it is treated.