Consistently, most previous research showed extremely high serum CK level (≥ 8000 U/L) in anti‐HMGCR‐positive JIIM patients, with a record of over 20000 U/L in a study with European patients.5, 7, 9, 11, 13, 14, 15, 16, 17. Here, HMGCR is linked to juvenile idiopathic inflammatory myopathy.