Sensitivity and clinical utility of the anti-cytosolic 5'-nucleotidase 1A (cN1A) antibody test in sporadic inclusion body myositis: Report of 40 patients from a single neuromuscular center.

•We report the sensitivity and clinical utility of the anti-cN1A antibody test in sporadic inclusion body myositis (IBM).•This is a retrospective review of 40 patients with clinico-pathologically defined or clinically defined IBM.•The anti-cN1A antibody test has limited diagnostic utility in IBM.