Pediatric rheumatology

Effect of Time to Start of Biologic Therapy on Treatment Response in Childhood Arthritis: Results From the UCAN CAN ‐ DU Cohort

Arthritis RheumatolPublished Prospective cohort study

Authors' conclusion

Early start of biologic therapies in patients with JIA was associated with a higher proportion of patients reaching inactive arthritis within six months, suggesting a window of opportunity to control disease activity.

Study context

Population
Biologic-naive patients with nonsystemic juvenile idiopathic arthritis (JIA) at start of biologic therapy, UCAN CAN-DU cohort, Canada and the Netherlands (66% female; median age at symptom onset 11.0 years)
Participants
130 patients
Exposure
Early vs intermediate vs late start of biologic therapy after symptom onset
  • Earlyn = 35
  • Intermediaten = 46
  • Laten = 49reference
Outcome
Inactive arthritis
Follow-up
Six months
Methodological detailsnested cohort, multicentre (Canada and the Netherlands), logistic regression adjusted for active joint count and physician global assessment
  • Nested cohort
  • Multicentre (Canada and the Netherlands)
  • Logistic regression adjusted for active joint count and physician global assessment

Main finding

As reported in the abstract

Significantly higher in early starters

Adjusted odds of active arthritis after six months, per month of delay to biologic start
1.09 (interquartile range: 1.02-1.17, P = 0.009)

Observational data: associations, not effects.

Original publication

Effect of Time to Start of Biologic Therapy on Treatment Response in Childhood Arthritis: Results From the UCAN CAN ‐ DU Cohort. Arthritis Rheumatol. Published 16 January 2026. doi:10.1002/art.43401

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