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14 United States sites
18 to 65 Years
– Age 18 to 65 years at the time of signing the informed consent.
– An understanding, ability, and willingness to fully comply with study procedures and
– Ability to voluntarily provide written, signed, and dated (personally or via a legally
authorized representative) informed consent to participate in the study.
– Male or female with a documented history of HbSS or HbSβo thalassemia (based on
clinical record of genetic, electrophoresis, or high-performance liquid chromatography
– Participant currently taking hydroxyurea must be on a stable dosing for 3 months at
– The participant was diagnosed with acute VOC in the 21 days before dosing on Day 1.
– The participant has undergone blood transfusion within the last 30 days or blood
transfusion on greater than or equal to (>=) 2 occasions in the last 90 days, at
– The participant has a history of acquired or congenital thrombotic thrombocytopenic
– The participant has serum creatinine level greater than (>) 1.2 milligrams per
– The participant has alanine transaminase >3* upper limit of normal (based on clinical
laboratory normal range), direct bilirubin level >2 mg/dL, or indirect bilirubin level
>5 mg/dL at the Screening Visit.
– The participant has a hemoglobin level <5 grams per deciliter (g/dL) at the Screening
- The participant has a platelet count of <100 000/cubic millimeter (mm^3) at the
- Signs or symptoms of infection requiring treatment with IV antibiotics during the
- The participant has fever with body temperature of >=38.5 degree Celsius (ºC) (101.3
degree Fahrenheit [ºF]) at the Screening Visit or before dosing on Day 1.
– The participant has Acute Chest Syndrome (ACS), diagnosed or strongly suspected, as
evidenced by a new infiltrate on chest radiograph, and one or more of the following
1. Fever with body temperature >39°C (102.2°F)
2. Hypoxia (confirmed by arterial blood gases with partial pressure of arterial
oxygen (PaO2) <70 millimeter of mercury [mmHg]) 3. Chest pain 4. Suspicious findings on physical examination (tachypnea, intercostal retraction, wheezing, and/or rales) - The participant has recently (within the past 28 days, from Screening Visit) undergone major surgery, requires hospitalization, documented serious bacterial infection requiring antibiotic treatment, or significant bleeding. - The participant has had a recent (within the past 90 days, from Screening Visit) episode of stroke, transient ischemic attack, symptomatic pulmonary hypertension, or seizure. - Any history of hemorrhagic stroke or bleeding diathesis. - The participant has received any of the following protocol-restricted medicines: a) systemic steroid therapy within 48 hours before dosing, or there is the expectation that such therapy may be given during the study (inhaled or topical steroids are allowed); b) Anticoagulant or antiplatelet therapy within the past 3 weeks before dosing; c) crizanlizumab within the past 30 days before dosing; d) voxelotor within the past 14 days before dosing. - For participants receiving chronic or long-acting opioids, a change in dose or pain requiring medical attention in the past 14 days before dosing. - The participant has a medical or psychiatric condition that, in the opinion of the investigator, may pose a risk to the participant for participation or interfere with the conduct or results of the study. - The participant has received or plans to receive any other investigational agent within the 4 weeks prior to the study screening visit or during the course of the study. - There is the expectation that the participant will not be able to be followed for the duration of the study. - The participant is pregnant or lactating or a female of childbearing potential or male unable or unwilling to comply with birth control methods or abstinence until the end of study visit. - The participant with active use of illicit drugs (excluding marijuana) and/or alcohol dependence, as determined by the investigator. - The participant has been administered SHP655 previously. - Known life-threatening hypersensitivity reaction, including anaphylaxis, to the parent molecule ADAMTS-13, hamster protein, or other constituents of SHP655. - The participant has a positive test result for hepatitis B surface antigen, or hepatitis C antibody, or human immunodeficiency virus (HIV) antigen/antibody, at the Screening Visit. However, a subject with a hepatitis C antibody and a negative hepatitis C virus ribonucleic acid (RNA) polymerase chain reaction test is not excluded.