- Design
- Multicentre retrospective cohort, 17 sites
- Population
- Children with skin-limited discoid lupus erythematosus
- Primary outcome
- Time to SLE diagnosis (ACR criteria)
- Effect
- 1-year progression 14.4% (95% CI 9.6 to 18.9); ANA positivity HR 3.71
A retrospective cohort across 17 paediatric centres followed children with skin-limited discoid lupus erythematosus to see how many went on to meet classification criteria for systemic lupus. The study was published in June.
By one year, 14.4% (95% CI 9.6 to 18.9) had progressed. A positive antinuclear antibody at baseline was the strongest predictor (hazard ratio 3.71), followed by older age (HR 1.11 per year). Antiphospholipid antibodies and cytopenias also predicted progression. The systemic disease that developed was mostly mild: most met mucocutaneous and laboratory criteria, and only 3% developed other organ involvement.
Because paediatric discoid lupus is rare, these data fill a gap in counselling families. The design is retrospective with missing data, so the precise rates are approximate.
In practice, a baseline antibody screen and blood count sort children into those who need close early review and those who can be followed less intensively. Whether treating discoid lupus more aggressively slows progression has not been tested.
- Check ANA, antiphospholipid antibodies and a full blood count when a child presents with discoid lupus.
- Review ANA-positive children closely in the first year, when progression is concentrated.
- Ask about joint pain, mouth ulcers and fatigue at each review.
- Involve paediatric rheumatology early if systemic features or cytopenias appear.
- Reassure families that systemic disease after discoid lupus was usually mild in this cohort.
Why it matters
One in seven children with skin-only discoid lupus may meet criteria for systemic lupus within a year, which changes how closely they should be watched.
Don't overread it
This retrospective cohort identifies who to monitor; it does not show that earlier treatment prevents systemic disease.
The statistics, in plain English
A hazard ratio of 3.71 means ANA-positive children progressed at nearly four times the rate of ANA-negative children over time. The 14.4% one-year figure has an interval from about 10% to 19%, which is the honest range to quote to families.
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