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Study details
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SPARKLE Trial: Crizanlizumab vs. Placebo for Frequent Vaso-Occlusive Crises in Sickle Cell Disease

Novartis Pharmaceuticals
NCT IDNCT06439082ClinicalTrials.gov data as of Apr 2026
Phase

Phase 3

Target enrollment

315

Study length

about 5.5 years

Ages

12–100

Locations

13 sites in AL, DC, FL +8

What this study is about

Researchers are testing whether crizanlizumab, a treatment, is more effective than placebo at reducing the frequency of vaso-occlusive crises in adults and adolescents with sickle cell disease. The trial will last 2003 days and involve approximately 315 participants.

Simplified from trial records by PatientMatch.

What you may be asked to do

  • 1.Receive Crizanlizumab
  • 2.Take Placebo

Participation Burden

What's physically and logistically required of participants.

Logistics & Travel
In-person visits

Requires travel to a study site

Physical Intervention
Standard

How treatment is administered

Treatment Assignment
Randomized & Blinded

You may get a placebo/standard care, and you won't know which.

Extracted study details

Pulled from the trial record to show what is being tested and what the study is measuring.

Drug classes

crizanlizumab

Endpoints

Secondary: Absolute change from baseline in hemoglobin, Incidence and severity of Adverse Events (AEs) and Serious Adverse Events (SAEs)