Multiple Myeloma Download PDF, 996KB, PDF Multiple myeloma is a cancer of a type of white blood cell called plasma cells, which are found in the bone marrow. Multiple myeloma occurs due to DNA mutations and with age. Most patients are aged over 60 years old. Find out about the symptoms of multple myeloma, how this condition is diagnosed and the treatment methods available. [Please download the PDF file if you are unable to view the image below.]