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Microvascular abnormalities between anti-TIF1-γ-associated dermatomyositis with and without malignancy
Sehreen Mumtaz1, Jordan Phillipps2, Megan M Sullivan3
1Department of Rheumatology, Mayo Clinic, 4500 San Pablo Rd S, Jacksonville, FL, 32224, USA. mumtaz.sehreen@mayo.edu.
BMC Rheumatology
|May 6, 2025
Summary
Anti-TIF1γ-positive dermatomyositis (DM) shows distinct nailfold video capillaroscopy (NVC) findings, including capillary loss and microhemorrhages. These microvascular changes may help predict malignancy in DM patients, warranting further research.
Area of Science:
- Rheumatology
- Dermatology
- Oncology
Background:
- Dermatomyositis (DM) is an immune-mediated myopathy linked to malignancy in up to 25% of cases.
- Anti-TIF1γ-positive DM patients have a higher risk of associated cancers.
- Nailfold video capillaroscopy (NVC) assesses vascular abnormalities but its role in anti-TIF1γ-positive DM with malignancy is unclear.
Purpose of the Study:
- To characterize NVC findings in anti-TIF1γ-positive DM.
- To assess the clinical relevance of NVC findings, especially in malignancy-associated cases.
- To explore potential microvascular predictors of cancer in DM.
Main Methods:
- Retrospective review of 19 anti-TIF1γ-positive DM cases and 18 idiopathic inflammatory myopathy controls.
- Data collected from Mayo Clinic, Jacksonville between January 2010 and May 2024.
- Analysis of NVC patterns including capillary density, microhemorrhages, and structural changes.
Main Results:
- Anti-TIF1γ-positive DM cases showed significantly increased capillary density loss and microhemorrhages (p=0.057).
- Higher frequencies of dilated capillaries, ramifications, and disorganization were observed.
- While not statistically significant, cancer-associated anti-TIF1γ-positive DM had more hemorrhages and ramifications.
Conclusions:
- NVC reveals microvascular differences in anti-TIF1γ-positive DM, particularly those with malignancy.
- These findings suggest NVC may have potential in predicting cancer development in DM patients.
- Larger studies are needed to further validate these promising microvascular observations.
