Clinical trial Recruiting at 4 sites Phase 2 Interventional Ages 16 to 50

Senicapoc for Sickle Cell Disease with Hemolytic Phenotype

Official title: A Multicenter, Randomized, Double-blind, Placebo-controlled Study With an Open-label Extension to Determine Efficacy and Safety of SIL-8301 in Sickle Cell Disease (SCD) Patients With a Predominantly Hemolytic Phenotype

Run by Biossil Inc. · NCT07282210 · Data updated 2026-11-12

A mid-stage study tests whether daily senicapoc helps people with sickle cell disease who have ongoing red blood cell breakdown and low hemoglobin, despite hydroxyurea, by comparing it to a placebo over 24 weeks.

Quick facts

PhasePhase 2
Study typeInterventional
Ages16 Years to 50 Years
SexAll
Enrollment65 (estimated)
SponsorBiossil Inc.
Industry-sponsored
Locations4 sites (Toronto, Ontario and 3 other locations)
StatusRecruiting
StartedNovember 2026
Main results expectedOctober 2029
Study endsOctober 2031
Registry record updatedNovember 2, 2026
Trial IDNCT07282210 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults and adolescents (16-50 years) with sickle cell disease, Hb ≤ 9.5 g/dL, and a predominantly hemolytic phenotype on hydroxyurea.

Probably not a fit

Patients with significant comorbidities, higher rate of painful crises, or prior exposure to senicapoc may be less likely to benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This phase 2 trial evaluates senicapoc versus placebo added to standard hydroxyurea therapy in adults and adolescents with sickle cell disease and a predominantly hemolytic profile. Participants must have Hb ≤ 9.5 g/dL and few prior painful crises to participate. The study uses a randomized design with daily oral dosing for up to 24 weeks, followed by an optional open-label extension for up to 2 years. The goal is to see if senicapoc can reduce hemolysis and improve hemoglobin levels while maintaining safety. Lead sponsor is Biossil Inc., with sites in Toronto and Montreal.

Why it matters

Potential benefit: If successful, patients could see improved red blood cell stability and higher hemoglobin, potentially reducing disease severity.

How similar studies have gone: Earlier studies in similar hemolytic sickle cell populations have shown signals with senicapoc, but this exact approach is being tested in a uniform endotype.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Documented diagnosis of sickle cell disease (SCD)
* 16-50 years of age
* Hemoglobin (Hb) ≤ 9.5 g/dL
* History of no more than 1 acute SCD-related painful crises requiring a visit to a medical facility per year within the preceding 2 years
* Steady-state hemolysis
* Current treatment with hydroxyurea

Exclusion Criteria:

* Receipt of senicapoc in a previous investigational study
* Current Red Blood Cell (RBC) transfusion or exchange transfusion program
* History of pulmonary hypertension
* Active cardiovascular, neurologic, endocrine, hepatic, or renal disorders
* Diagnosis of cancer (except non-melanoma skin cancer in situ, cervical cancer in situ, or breast cancer in situ) within the last 5 years
* History of liver disease

Where it's running

  • The Hospital for Sick Children
    Toronto, Ontario, Canada
    Recruiting
  • University Health Network, Toronto General Hospital
    Toronto, Ontario, Canada
    Recruiting
  • Centre Hospitalier de l'Université de Montréal (CHUM)
    Montreal, Quebec, Canada
    Recruiting
  • McGill University Health Centre
    Montreal, Quebec, Canada
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.