How do you interpret negative HMGCR antibody test results in a patient with necrotizing myopathy who has already been on treatment with steroids and whose CK has normalized?

HMGCR antibodies tend to remain present over time, even during periods of disease remission. Only recently have we began observing negative results in patients undergoing long-term treatment. Therefore, considering the patient received steroids for only a brief period, it's reasonable to suspect tha...