CHD4 and dermatomyositis: From the serum bank of the Department of Dermatology, Nagoya University Hospital, we screened anti-Mi-2β antibodies in sera from 124 Japanese patients with DM (including 13 with juvenile DM, 39 with clinically amyopathic DM, and 19 with cancer-associated DM), in which 108 serum samples had been used in our previous study [4].