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Skin Cancer01:30

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Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
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Detection of Anti-MDA5 Autoantibodies Using HeLa Cells and Immunocytochemistry with Light Microscopy
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Malignancy Risk and Predictors in Dermatomyositis and Polymyositis: A Large Population-Based Study.

Yonatan Shneor Patt1,2, Niv Ben-Shabat1,3, Paula David1,2,4

  • 1Department of Internal Medicine B & Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center, Tel-Hashomer, Ramat Gan 5262100, Israel.

Medicina (Kaunas, Lithuania)
|November 27, 2025
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Summary
This summary is machine-generated.

Idiopathic inflammatory myopathies (IIMs) increase cancer risk, particularly dermatomyositis (DM) which is linked to solid and blood cancers. Specific autoantibodies and older age at diagnosis predict higher malignancy risk in DM and polymyositis (PM).

Keywords:
autoantibodiescancerdermatomyositisepidemiologymalignancypolymyositis

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Area of Science:

  • Rheumatology and Oncology
  • Autoimmune Diseases and Cancer Epidemiology

Background:

  • Idiopathic inflammatory myopathies (IIMs) are rare autoimmune disorders with known associations with malignancy, especially in dermatomyositis (DM).
  • Previous studies on malignancy predictors in IIMs are limited by small sample sizes and lack of population-based data.
  • Understanding site-specific cancer patterns and risk factors in large, diverse IIM cohorts is crucial.

Purpose of the Study:

  • To evaluate malignancy patterns and identify predictors in a large, diverse cohort of patients with DM and polymyositis (PM).
  • To assess the association between IIM subtypes and the risk of both solid and hematologic malignancies.
  • To determine specific autoantibodies and clinical factors associated with increased cancer risk in IIM patients.

Main Methods:

  • Retrospective cohort study utilizing the Clalit Health Services electronic database (2002-2018).
  • Inclusion of 1557 DM patients and 528 PM patients, matched with controls at a 1:5 ratio.
  • Analysis of malignancy incidence and risk using Cox proportional hazards models and logistic regression for predictors.

Main Results:

  • DM showed a significantly increased risk for both solid and hematologic malignancies (HR 1.89), while PM had a less pronounced association limited to solid cancers (HR 1.50).
  • In DM, elevated risks were observed for breast cancer (HR 1.86) and chronic leukemia (HR 5.02).
  • Older age at diagnosis and specific autoantibodies (antiphospholipid, lupus anticoagulant, anti-Mi2, various antinuclear antibodies) were associated with increased malignancy risk across both subtypes.

Conclusions:

  • Both DM and PM are associated with an increased risk of malignancy, with DM exhibiting a broader association including hematologic cancers.
  • Older age and a distinct serological profile, particularly antiphospholipid and antinuclear antibodies, are key predictors of heightened malignancy risk.
  • Heightened clinical vigilance is warranted for IIM patients with these risk factors to facilitate early cancer detection.