His autoantibody screen was positive for mid‐body nuclear antibody (titre 1:320) and myositis‐specific antibody (MSA, title 1:80) but negative for IgG and IgA sperm antibodies, transglutaminase, adrenal, extractable nuclear antigen, gastric parietal cell, intrinsic factor, anti‐neutrophil and neutrophil cytoplasmic antibodies. This evidence concerns the gene CD79A and myositis disease.