Rheumatology · 4 h ago
Korean cohort links mixed connective tissue disease to higher cancer risk
A nationwide population-based cohort study compared cancer incidence in 2,094 Korean patients with newly diagnosed mixed connective tissue disease (MCTD) with rates in the general population. Overall cancer incidence was 2.61 times higher, with the largest relative increase for hematologic cancers.
- Overall cancer incidence was 2.61 times the population rate.
- Hematologic cancer had the largest relative increase.
- Relative risk peaked in the first year after diagnosis.
- The observational findings do not establish a screening strategy.
Researchers used Korean National Health Insurance Service data to identify 2,094 people newly diagnosed with MCTD from 2004 to 2020, contributing 16,409 person-years. They calculated standardized incidence ratios (SIRs) against age- and sex-matched population rates.
Overall cancer incidence was higher among patients with MCTD (SIR 2.61, 95% CI 2.27–2.99). Risks were elevated for solid cancers (SIR 2.46, 95% CI 2.12–2.84) and hematologic cancers (SIR 6.81, 95% CI 4.36–10.13). Reported sites included lung, ovary, liver, pancreas, cervix, prostate and several other solid tumors; multiple myeloma, myelodysplastic syndrome and non-Hodgkin lymphoma were among the hematologic cancers with increased incidence. Relative risk was highest at ages 20–39 (SIR 4.04) and during the first year after MCTD diagnosis (SIR 3.77).
The findings support awareness of cancer in patients with MCTD, particularly when clinical features are suggestive, but do not establish causation or a screening strategy. The observational study used national Korean data, so applicability to other populations and the implications for individual risk assessment remain uncertain.
In practice
For patients with MCTD, this Korean nationwide observational cohort found higher cancer incidence than in the general population, with the largest relative increase for hematologic cancers and elevated relative risk in the first year after diagnosis. These results support considering malignancy when a patient has suggestive clinical features, including at younger ages. They do not show that MCTD causes cancer, quantify an individual patient’s absolute risk, or establish a screening schedule; findings from Korea may not apply equally elsewhere.
AI-generated clinical interpretation · Not editor-reviewed
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Clinical Rheumatology: Increased risk of cancer in patients with mixed connective tissue disease: a population-based cohort study in Korea ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.