Allogeneic Mitochondria (PN-101) Transplantation for Refractory Polymyositis or Dermatomyositis

"PN-101: Mitochondria isolated from Allogeneic Umbilical Cord-derived Mesenchymal Stem Cells.~3 or 6 subjects are enrolled in each dose group in line with the traditional 3+3 rule-based method, and the investigator intravenously administers a single-dose of the investigational product according to the planned dose."