As the enhanced levels of the serum antibodies to gliadin are found in patients with celiac disease, as well as of antibodies to transglutaminase-2 (TTG-2) [4,5], to calreticulin [6,7] and Ro/SSA antigen [8], the aim of this work was the screening of MM patients' sera for their immunoreactivity to food constituent gliadin, and to autoantigens: tissue transglutaminase-2 (tTG-2) and Ro/SSA antigen, in order to assess whether immunoreactivity to mentioned antigens at least partially contributes to the immunological imbalance in multiple myeloma. The gene discussed is TRIM21; the disease is Miyoshi myopathy.