[Rheumatoid arthritis and multiple myeloma as comorbidity. Is tocilizumab a therapy option?].

Multiple myeloma (MM) is a disease of the elderly with an incidence of 4/100,000 per year and can occur as a comorbidity especially in elderly patients with rheumatoid arthritis (RA). For MM and also for RA interleukin-6 (IL-6) is a pathogenetically important cytokine in both disease events. This article presents the case of a female patient who achieved sustained remission of RA and stabilization of MM with quantitative reduction of paraprotein by treatment with tocilizumab. The question whether tocilizumab represents a meaningful treatment approach for treatment of RA when MM is also present will be discussed.