TY - JOUR
T1 - Clinical utility of anti-cytosolic 5’-nucleotidase 1A antibody in idiopathic inflammatory myopathies
AU - Ikenaga, Chiseko
AU - Findlay, Andrew R.
AU - Goyal, Namita A.
AU - Robinson, Sarah
AU - Cauchi, Jonathan
AU - Hussain, Yessar
AU - Wang, Leo H.
AU - Kershen, Joshua C.
AU - Beson, Brent A.
AU - Wallendorf, Michael
AU - Bucelli, Robert C.
AU - Mozaffar, Tahseen
AU - Pestronk, Alan
AU - Weihl, Conrad C.
N1 - Publisher Copyright:
© 2021 The Authors. Annals of Clinical and Translational Neurology published by Wiley Periodicals LLC on behalf of American Neurological Association
PY - 2021/3
Y1 - 2021/3
N2 - Objective: To define the clinicopathologic features and diagnostic utility associated with anti-cytosolic 5′-nucleotidase 1A (NT5C1A) antibody seropositivity in idiopathic inflammatory myopathies (IIMs). Methods: Anti-NT5C1A antibody status was clinically tested between 2014 and 2019 in the Washington University neuromuscular clinical laboratory. Using clinicopathologic information available for 593 patients, we classified them as inclusion body myositis (IBM), dermatomyositis, antisynthetase syndrome, immune-mediated necrotizing myopathy (IMNM), nonspecific myositis, or noninflammatory muscle diseases. Results: Of 593 patients, anti-NT5C1A antibody was found in 159/249 (64%) IBM, 11/53 (21%) dermatomyositis, 7/27 (26%) antisynthetase syndrome, 9/76 (12%) IMNM, 20/84 (24%) nonspecific myositis, and 6/104 (6%) noninflammatory muscle diseases patients. Among patients with IBM, anti-NT5C1A antibody seropositive patients had more cytochrome oxidase-negative fibers compared with anti-NT5C1A antibody seronegative patients. Among 14 IBM patients initially negative for anti-NT5C1A antibody, three patients (21%) converted to positive. Anti-NT5C1A antibody seropositivity did not correlate with malignancy, interstitial lung disease, response to treatments in dermatomyositis, antisynthetase syndrome, and IMNM, or survival in IIMs. Interpretation: Anti-NT5C1A antibody is associated with IBM. However, the seropositivity can also be seen in non-IBM IIMs and it does not correlate with any prognostic factors or survival.
AB - Objective: To define the clinicopathologic features and diagnostic utility associated with anti-cytosolic 5′-nucleotidase 1A (NT5C1A) antibody seropositivity in idiopathic inflammatory myopathies (IIMs). Methods: Anti-NT5C1A antibody status was clinically tested between 2014 and 2019 in the Washington University neuromuscular clinical laboratory. Using clinicopathologic information available for 593 patients, we classified them as inclusion body myositis (IBM), dermatomyositis, antisynthetase syndrome, immune-mediated necrotizing myopathy (IMNM), nonspecific myositis, or noninflammatory muscle diseases. Results: Of 593 patients, anti-NT5C1A antibody was found in 159/249 (64%) IBM, 11/53 (21%) dermatomyositis, 7/27 (26%) antisynthetase syndrome, 9/76 (12%) IMNM, 20/84 (24%) nonspecific myositis, and 6/104 (6%) noninflammatory muscle diseases patients. Among patients with IBM, anti-NT5C1A antibody seropositive patients had more cytochrome oxidase-negative fibers compared with anti-NT5C1A antibody seronegative patients. Among 14 IBM patients initially negative for anti-NT5C1A antibody, three patients (21%) converted to positive. Anti-NT5C1A antibody seropositivity did not correlate with malignancy, interstitial lung disease, response to treatments in dermatomyositis, antisynthetase syndrome, and IMNM, or survival in IIMs. Interpretation: Anti-NT5C1A antibody is associated with IBM. However, the seropositivity can also be seen in non-IBM IIMs and it does not correlate with any prognostic factors or survival.
UR - http://www.scopus.com/inward/record.url?scp=85100524814&partnerID=8YFLogxK
U2 - 10.1002/acn3.51294
DO - 10.1002/acn3.51294
M3 - Article
C2 - 33556224
AN - SCOPUS:85100524814
SN - 2328-9503
VL - 8
SP - 571
EP - 578
JO - Annals of Clinical and Translational Neurology
JF - Annals of Clinical and Translational Neurology
IS - 3
ER -