Multicenter randomized controlled trial on Duration of Therapy for Thrombosis in Children and Young Adults (the Kids-DOTT trial): pilot/feasibility phase findings.

Journal Article (Journal Article;Multicenter Study)

BACKGROUND: Randomized controlled trials (RCTs) on pediatric venous thromboembolism (VTE) treatment have been challenged by unsubstantiated design assumptions and/or poor accrual. Pilot/feasibility (P/F) studies are critical to future RCT success. METHODS: The Kids-DOTT trial is a multicenter RCT investigating non-inferiority of a 6-week (shortened) versus 3-month (conventional) duration of anticoagulation in patients aged < 21 years with provoked venous thrombosis. Primary efficacy and safety endpoints are symptomatic recurrent VTE at 1 year and anticoagulant-related, clinically relevant bleeding. In the P/F phase, 100 participants were enrolled in an open, blinded-endpoint, parallel-cohort RCT design. RESULTS: No eligibility violations or randomization errors occurred. Of the enrolled patients, 69% were randomized, 3% missed the randomization window, and 28% were followed in prespecified observational cohorts for completely occlusive thrombosis or persistent antiphospholipid antibodies. Retention at 1 year was 82%. Interobserver agreement between local and blinded central determination of venous occlusion by imaging at 6 weeks after diagnosis was strong (k-statistic = 0.75; 95% confidence interval [CI] 0.48-1.0). The primary efficacy and safety event rates were 3.3% (95% CI 0.3-11.5%) and 1.4% (95% CI 0.03-7.4%). CONCLUSIONS: The P/F phase of the Kids-DOTT trial has demonstrated the validity of vascular imaging findings of occlusion as a randomization criterion, and defined randomization, retention and endpoint rates to inform the fully powered RCT.

Full Text

Duke Authors

Cited Authors

  • Goldenberg, NA; Abshire, T; Blatchford, PJ; Fenton, LZ; Halperin, JL; Hiatt, WR; Kessler, CM; Kittelson, JM; Manco-Johnson, MJ; Spyropoulos, AC; Steg, PG; Stence, NV; Turpie, AGG; Schulman, S; Kids-DOTT Trial Investigators,

Published Date

  • September 2015

Published In

Volume / Issue

  • 13 / 9

Start / End Page

  • 1597 - 1605

PubMed ID

  • 26118944

Pubmed Central ID

  • PMC4561031

Electronic International Standard Serial Number (EISSN)

  • 1538-7836

Digital Object Identifier (DOI)

  • 10.1111/jth.13038


  • eng

Conference Location

  • England