Hydroxyurea Optimization Through Precision Study (HOPS): A Prospective, Multi-center, Randomized Trial of Personalized, Pharmacokinetics-guided Dosing of Hydroxyurea Versus Standard Weight-based Dosing for Children With Sickle Cell Anemia.

About the study

Hydroxyurea Optimization through Precision Study (HOPS) is a prospective, multi-center, randomized trial that will directly compare a novel, individualized dosing strategy of hydroxyurea to standard weight-based dosing for children with SCA. The primary objective of the study is to evaluate whether a pharmacokinetics-based starting hydroxyurea dose thieves superior fetal hemoglobin response to to standard weight-based initial dosing. Patients will be recruited from the pediatric sickle cell clinic at Cincinnati Children’s Hospital Medical Center and from additional pediatric sickle cell centers within the United States.

Study point of contact

Amanda Pfeiffer
Patrick McGann, MD


14 United States sites


6 Months - 21 Years




Phase 3

Study type






participation requirements

Diagnosis of sickle cell anemia (HbSS, HbSD, HbS/β0-thalassemia, or similarly severe SCA genotype)
Age 6 months to 21 years at the time of enrollment
Clinical decision by patient, family, and healthcare providers to initiate hydroxyurea therapy

participation restrictions

Current treatment with chronic, monthly blood transfusions or erythrocytapheresis
Treatment with hydroxyurea within the past 3 months
Hemoglobin SC disease, HbS/β+-thalassemia
Current treatment with other investigational sickle cell medications
Current known pregnancy or lactation


  • Phoenix, Arizona, United States, Phoenix Children's Hospital, 85016 [Recruiting]
  • Atlanta, Georgia, United States, Children's Healthcare of Atlanta, 30342 [Recruiting]
  • Peoria, Illinois, United States, Children's Hospital of Illinois, 61637 [Recruiting]
  • Urbana, Illinois, United States, Carle Foundation Hospital, 61801 [Recruiting]
  • Indianapolis, Indiana, United States, Riley Hospital for Children at Indiana University Health, 46202 [Recruiting]
  • Indianapolis, Indiana, United States, Indiana Hemophilia & Thrombosis Center, Inc. (IHTC), 46260 [Recruiting]
  • Boston, Massachusetts, United States, Boston Children's Hospital, 02215 [Recruiting]
  • Minneapolis, Minnesota, United States, Children's Hospitals and Clinics of Minnesota, 55404 [Recruiting]
  • New Hyde Park, New York, United States, Cohen Children's Medical Center/Northwell Health, 11040 [Recruiting]
  • Cincinnati, Ohio, United States, Cincinnati Children's Hospital Medical Center, 45229 [Recruiting]
  • Cleveland, Ohio, United States, Rainbow Babies / University Hospitals Cleveland Medical Center, 44106 [Recruiting]
  • Cleveland, Ohio, United States, Cleveland Clinic Children's, 44195 [Withdrawn]
  • Columbus, Ohio, United States, Nationwide Children's Hospital., 43205 [Recruiting]
  • Milwaukee, Wisconsin, United States, Children's Hospital of Wisconsin, 53226 [Recruiting]
Last updated 2021-12-07