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Autoimmune Disorders01:29

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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  11. Rheumatoid Arthritis And Risk Of Thyroid Cancer: A Nationwide Cohort Study

Rheumatoid arthritis and risk of thyroid cancer: A nationwide cohort study

Mi Hee Cho1, Jinhyung Jung2, Tae Hyuk Kim3

  • 1Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.

Arthritis Care & Research
|June 13, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

This study found no increased risk of thyroid cancer in rheumatoid arthritis (RA) patients compared to the general population. RA serologic status, age, and sex did not significantly alter thyroid cancer risk.

Area of Science:

  • Rheumatology
  • Oncology
  • Epidemiology

Background:

  • Rheumatoid arthritis (RA) is a chronic autoimmune disease with known associations with certain cancers.
  • Research on the specific risk of thyroid cancer in RA patients is limited.
  • Understanding cancer risks in RA is crucial for patient management and early detection.

Purpose of the Study:

  • To investigate the risk of thyroid cancer in patients diagnosed with rheumatoid arthritis.
  • To examine the influence of RA serologic status (seropositive vs. seronegative) on thyroid cancer risk.
  • To analyze potential modifying effects of sex and age on this association.

Main Methods:

  • A nationwide database was used to identify 40,895 incident rheumatoid arthritis (RA) patients (2010-2017).
  • RA patients were matched 1:5 to 204,475 non-RA controls based on sex and age.

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  • Cox regression analyses were employed to assess thyroid cancer risk, with stratified analyses for sex and age.

    • Main Results:

    • Over a median follow-up of 5.5 years, the overall risk of thyroid cancer in RA patients was similar to controls (aHR 0.98, 95% CI 0.85-1.13).
    • Seropositive RA patients did not exhibit a significantly different risk of thyroid cancer compared to seronegative RA patients (aHR 1.03, 95% CI 0.78-1.36).
    • Stratified analyses by age and sex revealed no statistically significant interactions.

    Conclusions:

    • Newly diagnosed rheumatoid arthritis (RA) patients do not face an elevated risk of thyroid cancer compared to matched controls.
    • The incidence of thyroid cancer in RA patients is not influenced by their serologic status, age, or sex.