In parallel, increased levels of interleukin (IL)1β were observed in a fraction of MGUS and SMM, while increased serum IL8 was characteristic of SMM and MM, and higher serum IL6, RANKL and bone alkaline phosphatase concentrations, together with decreased counts of FcεRI+cMo, were restricted to MM presenting with bone lesions. Here, IL6 is linked to Miyoshi myopathy.