A Study of the Effect of IW-1701, a Stimulator of Soluble Guanylate Cyclase (sGC), on Patients With Sickle Cell Disease (SCD)

INCLUSION CRITERIA

1. Patient is ambulatory male or female 16 to 70 years of age at the Screening Visit.

2. Patient has SCD, including HbSS, HbSC, HbSβ0-thalassemia, or HbSβ+-thalassemia,
documented in their medical history.

3. If patient is on medication(s) for SCD, such as hydroxyurea (HU), are on a stable
regimen.

4. Per medical history and/or patient recall, patient has had at least 1 and no more than
10 sickle cell-related pain crises in the 12 months before the Screening Visit and
none occurring in the 4 weeks before the Randomization Visit.

5. Patient completes daily eDiary entries for at least 10 days during the last 14 days of
the Run in Period as assessed at the Randomization Visit.

6. Women of childbearing potential must have a negative pregnancy test prior to
randomization and must agree to use protocol-specified contraception from the
Screening Visit through 90 days after the final dose of study drug.

7. Male patients must be surgically sterile by vasectomy (conducted ≥60 days before the
Screening Visit or confirmed via sperm analysis) or must agree to use
protocol-specified contraception and agree to refrain from sperm donation from the
Screening Visit through 90 days after the final dose of study drug.

EXCLUSION CRITERIA

1. Patient requires a program of prescheduled, regularly administered chronic blood
transfusion therapy.

2. Patient has been hospitalized for an SCD-related complication in the 4 weeks before
the Randomization Visit.

3. Patient has taken opioid(s) >200 morphine mg equivalent/day within the 4 weeks before
the Randomization Visit.

4. Patient is taking aspirin ≥325 mg daily, P2Y12 inhibitors, any anticoagulant
medication, specific inhibitors of phosphodiesterase 5 (PDE5), nonspecific inhibitors
of PDE5, moderate or strong cytochrome P450 3A (CYP3A) inhibitors, any supplements for
the treatment of erectile dysfunction, riociguat, or nitrates or nitric oxide donors
in any form.

5. Patient has major concurrent illness or medical condition that in the opinion of the
Investigator would preclude participation in a clinical study.

NOTE: Other inclusion and exclusion criteria apply, per protocol