Amyopathic and anti-TIF1 gamma-positive dermatomyositis: analysis of a monocentric cohort and proposal to update diagnostic criteria
Didona, Dario
Amyopathic and anti-TIF1 gamma-positive dermatomyositis: analysis of a monocentric cohort and proposal to update diagnostic criteria - 2020.
24
Background: Dermatomyositis (DM) is a group of autoimmune diseases characterized by a variable degree of skin symptoms and myopathy. An amyopathic form of DM (ADM) has been described, and more recently, an anti-TIF-1 gamma-positive subtype, characterized by poikiloderma and associated with a relatively high risk of cancer. Objectives: To characterise a cohort of DM patients. Material and Methods: A cohort of 29 DM patients was followed between January 2004 and March 2019, and investigated for clinical characteristics, pathological features based on electromyography and MRI, laboratory data, and auto-antibody profile. Results: Based on the investigations, DM was shown to be heterogeneous. However, we identified a subgroup of anti-TIF-1 gamma-positive patients who all shared heliotrope erythema. Furthermore, we observed a positive correlation between serum glutamicoxaloacetic transaminase (GOT) and creatine kinase (CK) concentrations in patients with anti-TIF-1 gamma antibodies, which is not found in patients with anti-MDA-5 antibodies. Conclusion: Based on the findings of this study, we propose an update of the Sontheimer et al. diagnostic criteria to improve the sensitivity of diagnosis for ADM. In addition, we describe a significant association between serum GOT and CK levels in DM patients with anti-TIF-1 gamma antibodies, and further highlight the significance of heliotrope rash as a clinical hallmark for this particular subset of patients.
Amyopathic and anti-TIF1 gamma-positive dermatomyositis: analysis of a monocentric cohort and proposal to update diagnostic criteria - 2020.
24
Background: Dermatomyositis (DM) is a group of autoimmune diseases characterized by a variable degree of skin symptoms and myopathy. An amyopathic form of DM (ADM) has been described, and more recently, an anti-TIF-1 gamma-positive subtype, characterized by poikiloderma and associated with a relatively high risk of cancer. Objectives: To characterise a cohort of DM patients. Material and Methods: A cohort of 29 DM patients was followed between January 2004 and March 2019, and investigated for clinical characteristics, pathological features based on electromyography and MRI, laboratory data, and auto-antibody profile. Results: Based on the investigations, DM was shown to be heterogeneous. However, we identified a subgroup of anti-TIF-1 gamma-positive patients who all shared heliotrope erythema. Furthermore, we observed a positive correlation between serum glutamicoxaloacetic transaminase (GOT) and creatine kinase (CK) concentrations in patients with anti-TIF-1 gamma antibodies, which is not found in patients with anti-MDA-5 antibodies. Conclusion: Based on the findings of this study, we propose an update of the Sontheimer et al. diagnostic criteria to improve the sensitivity of diagnosis for ADM. In addition, we describe a significant association between serum GOT and CK levels in DM patients with anti-TIF-1 gamma antibodies, and further highlight the significance of heliotrope rash as a clinical hallmark for this particular subset of patients.
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