National Heart, Lung, and Blood Institute (NHLBI)
Background: Sickle cell disease (SCD) is a genetic disease that causes the body to produce abnormal ( sickled ) red blood cells. SCD can cause anemia and life-threatening complications in the lungs, heart, kidney, and nerves. People with SCD are also at increased risk of forming blood clots in the veins and lungs, but the standard treatments for these clots can cause increased bleeding in people with SCD. Better treatments are needed. Objective: To test a drug (fostamatinib) in people with SCD. Eligibility: People aged 18 to 65 with SCD. Design: Participants will have 6 clinic visits over 12 weeks. Each visit will be 2 to 3 hours. Participants will be screened. They will have a physical exam with blood tests. They will tell the researchers about the medications they take. Fostamatinib is a tablet taken by mouth. Participants will take the drug at home, twice a day, for up to 6 weeks. Participants will have a clinic visit every 2 weeks while they are taking the drug. At each visit they will have a physical exam with blood tests. They will talk about any side effects the drug may be causing. If they are tolerating the drug well after the first 2 weeks, they may begin taking a higher dose. Participants will have a final visit 4 weeks after they stop taking the drug. They will have a physical exam and blood tests; they will be checked for any side effects of the drug.
Study Description: The overall objective of this study is to assess the clinical safety and tolerability of fostamatinib in subjects with stable sickle cell disease (SCD). Subjects enrolled in cohort 1 will receive fostamatinib 100 mg orally twice daily (BID) for 2 weeks then escalate to 150 mg orally BID for an additional four weeks. Subjects enrolled in cohort 2 will receive fostamatinib 100 mg orally once daily (QD) for 2 weeks then escalate to 150 mg orally QD for an additional four weeks. Cohort 2 will allow the subjects from cohort 1 the option to re-enroll to undergo the QD dosing regi…
* INCLUSION CRITERIA: Subjects will enroll onto the study and undergo screening. Subjects who do not meet any of the following criteria during screening will not receive the study intervention but will be counted toward study accrual. Screen failures may be rescreened at a later time. In order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. Have provided signed written informed consent prior to performing any study procedure, including screening procedures. 2. Age between 18-65 years 3. Unequivocal diagnosis of SCA (HbSS or HbSBeta\^0) c…
Fostamatinib will be administered orally for 6 weeks. Dosing will begin at 100 mg and increase to 150 mg after 2 weeks. The dosing frequency will be once daily or twice daily, depending on cohort assignment.