Patients with Gaucher disease have an increased risk of developing myeloma and Parkinson's disease. Myeloma, also known as multiple myeloma, is a type of bone marrow cancer affecting the white blood cells of the immune system which generate antibodies. Approximately 1 in 10 Gaucher patients have a specific blood protein - a monoclonal antibody called a paraprotein, which is found in both malignant and non-malignant conditions, including myeloma.