Barriers to hydroxyurea use from the perspectives of providers, individuals with sickle cell disease, and families: Report from a U.S. regional collaborative

Adherence outcomes of a liquid hydroxyurea delivery program in a pediatric population

BACKGROUND

Hydroxyurea remains underutilized in the pediatric sickle cell population despite its well-known efficacy in decreasing sickle cell complications and hospitalizations. Access to refills and liquid formulation remains a critical barrier to adherence to hydroxyurea regimens. This study was undertaken to determine the clinical impact of home-delivering compounded liquid hydroxyurea (LHU) to pediatric patients with sickle cell disease.

PROCEDURE/METHODS

A retrospective cohort study was conducted using electronic health records and pharmacy databases. Pediatric patients younger than 21 years of age at the time of hydroxyurea initiation from March 2016 to July 2020 who received compounded LHU from Boston Medical Center Pharmacy were included. The primary outcomes of the study were drug adherence (assessed by evaluating the proportion of days covered [PDC]), rates of acute care utilization before and after enrolling in the LHU delivery program.

RESULTS

The final cohort included 41 patients, showing a significant decrease in hospitalizations (p = .01) and acute chest syndrome episodes (p = .03) after the initiation of the LHU delivery program. In comparing hydroxyurea-naïve patients with those previously exposed to hydroxyurea, the latter group had lower hospitalization rates (p = .01), fewer vaso-occlusive event (VOE) episodes (p = .02), and fewer emergency department (ED) visits (p = .01). The median PDC value 1 year post initiation of LHU was 95.

CONCLUSIONS

Home delivery of compounded LHU from the pharmacy to pediatric sickle cell disease patients improved access to hydroxyurea, and was linked to reduced hospitalizations and acute chest syndrome episodes. This advancement in cost savings and improved patient outcomes is a significant step forward in pediatric hematology. By overcoming access barriers, home delivery programs can greatly enhance outcomes among pediatric patients with sickle cell disease.

Social Vulnerability and Sickle Cell Disease Mortality in the US

Importance

Social determinants of health (SDOH) influence health outcomes, including those of sickle cell disease (SCD), despite advancements in treatments like disease-modifying therapies.

Objective

To investigate the association of SDOH with SCD mortality rates from 2016 to 2020.

Design, Setting, and Participants

This cross-sectional study combined county-level data from the Centers for Disease Control and Prevention and Agency for Toxic Substances and Disease Registry Social Vulnerability Index (SVI) with SCD mortality data from the Centers for Disease Control and Prevention Wide-Ranging Online Data for Epidemiologic Research database from January 1, 2016, to December 31, 2020. US counties were divided into 4 quartile (Q) models according to their SVI scores. Deaths from SCD in the US among patients of all ages were included. Data analysis occurred from March to April 2024.

Exposure

SVI score.

Main Outcomes and Measures

Age-adjusted mortality rates (AAMRs) per 1 000 000 individuals were measured. Rate ratios (RRs) were obtained by comparing county-specific AAMRs of SVI-Q4 with SVI-Q1.

Results

From 2016 to 2020, among a total population of 1 633 737 771 individuals, there were 2635 deaths from SCD (1289 male [49.1%] and 1336 female [50.9%]). There were 1480 deaths in Q4, 687 deaths in Q3, 344 deaths in Q2, and 114 deaths in Q1. Higher SVI was associated with 2.11 excess deaths per 1 000 000 individuals (RR, 4.90; 95% CI, 4.81-5.00). Similar trends were seen for both males (RR, 4.56; 95% CI, 4.44-4.69) and females (RR, 5.85; 95% CI, 5.68-6.03). Middle-aged patients with SCD had the highest mortality rate in Q4, with 3.45 excess deaths per 1 000 000 individuals (RR, 4.97; 95% CI, 4.85-5.09). Higher SVI was associated with 2.29 excess deaths per 1 000 000 individuals in African American individuals with SCD (RR, 1.24; 95% CI, 1.22-1.27]). In White individuals with SCD, higher SVI was associated with 0.12 excess deaths per 1 000 000 individuals (RR not available due to unreliable data in Q1). When stratifying by census region, the highest level of SCD-related mortality was in the Northeast, with higher SVI associated with 3.16 excess deaths per 1 000 000 individuals (RR, 8.02; 95% CI, 7.66-8.40).

Conclusions

In this cross-sectional study of the association of SVI with SCD mortality rates, higher SVI was associated with higher SCD mortality across US counties. These findings underscore the importance of addressing social determinants of health to improve mortality outcomes among patients with SCD.

The medication usage pattern and prevalence of polypharmacy among patients with sickle cell disease: a population-based study in southern Iran

BACKGROUND

Due to the numerous complications associated with sickle cell disease (SCD), patients often receive a variety of medications alongside their SCD treatment. However, a notable gap exists in the current literature regarding medication use patterns among them. This study aimed to investigate medication usage patterns in patients with SCD.

RESEARCH DESIGN AND METHODS

This cross-sectional study, conducted in Bushehr Province, employed a stratified random sampling method to select eligible participants with SCD. A thorough interview gathered various information, including details about the medications. The Anatomical Therapeutic Chemical classification system was utilized for drug classification. Polypharmacy was defined as the concurrent use of at least five medications.

RESULTS

A total of 300 individuals with SCD were included in this study. Polypharmacy was observed in 26.3% (95% CI: 20.8%-32.8%) of the study population. The analyses revealed positive associations between the use of more concurrent medication use and higher age groups and having multimorbidity. Antianemic preparations (86.7%), antineoplastic agents (58.3%), and vitamins (41.0%) were the most frequent medication classes used by the study participants.

CONCLUSIONS

Our study revealed notable underutilization of hydroxyurea and a high rate of polypharmacy, associated with age and multimorbidity, among patients with SCD in southern Iran.

Assessing multilevel barriers to hydroxyurea adherence in youth with sickle cell disease using pharmacy-based refill records

BACKGROUND

Suboptimal medication adherence is common across youth with chronic health conditions and may contribute to health disparities and adverse health outcomes, especially in underserved communities.

METHODS

Using pharmacy prescription records and guided by the World Health Organization Multidimensional Adherence Model, we examined patient-, treatment-, and health system-related factors that may affect hydroxyurea adherence in 72 youth with sickle cell disease (SCD), 10-18 years who had participated in the multisite "Hydroxyurea Adherence for Personal Best in SCD" (HABIT) feasibility (6 months) and efficacy (12 months) trials. Pharmacy data were collected from the year prior to study entry through the duration of each trial. We also examined hydroxyurea dose at baseline, prescribing patterns (hydroxyurea formulation and dose prescribed), quantity of hydroxyurea dispensed, and number of daily capsules/tablets prescribed. Data were analyzed using descriptive statistics.

RESULTS

On average, youth were prescribed 1095 ± 402 mg hydroxyurea per day, requiring ingestion of 3 or more capsules for 39.4% of youth. Frequently identified potential barriers were complex medication regimens in which dose of hydroxyurea differed by day of week (47.2%); receipt of an inadequate (< 30 days) supply of hydroxyurea from the pharmacy ≥ 3 times during record collection period (29.2%); and prescription of hydroxyurea suspension suggesting problems swallowing capsules (22.2%). In this sample, most youth were exclusively prescribed 500 mg capsules (62.5%), which was associated with complex medication regimens (RR 3.0, 95% CI 1.4-6.7). Potential barriers were common, occurred at all levels and are potentially modifiable with targeted interventions at the treatment- and health system-related levels.

Clinical Practice Patterns in Sickle Cell Disease Treatment: Disease-modifying and Potentially Curative Therapies

Therapeutic options for sickle cell disease (SCD) have increased recently as well as the development of updated national guidelines. It is not known how these options are being offered or to what degree guidelines are incorporated into clinical practice. This study aimed to describe practice patterns for pediatric hematologists regarding the use of disease-modifying and potentially curative therapies for SCD. A 9-section, cross-sectional electronic survey was disseminated during a 3-month period via SurveyMonkey, to members of the American Society of Pediatric Hematology/Oncology Hemoglobinopathy Special Interest Group (ASPHO HSIG). A total of 88 physician members of the ASPHO HSIG were surveyed. Ninety percent of respondents (72/80) start hydroxyurea routinely in patients with HbSS and HbSβ 0 thalassemia, regardless of disease severity. Laboratory monitoring was recommended every 3 months for stable dosing in 63.8% (51/80). New therapies were recommended for patients on hydroxyurea who were still experiencing SCD complications: L-glutamine 68.5% (37/54) or crizanlizumab 93.1% (54/58). Voxelotor was recommended for patients on hydroxyurea with low hemoglobin in 65.1% (43/66) of cases. Matched sibling transplant was considered for any disease severity by 55.1% (38/69). Gene therapy trials are offered on-site by 29% (20/69). Our study demonstrated the enhanced utilization of hydroxyurea while revealing the unexplored potential of other disease-modifying therapies in SCD. These findings underscore the importance of continued knowledge acquisition about the long-term efficacy of new medical therapies and addressing barriers to the use of proven therapies and guide the development of future studies of optimal SCD management.

Advances in pharmacotherapy for sickle cell disease: what is the current state of play?

INTRODUCTION

Despite over 100 years of neglect and insufficient funding, sickle cell disease has risen to the top of the discussions due to the recent approval of two new genetic therapies. Prior to these approvals, there were only four prior approved medications for sickle cell disease in spite of being the most common inherited blood disorder. The advent and expense of these new genetic therapies have finally brought the trials and tribulations associated with SCD including the suffering and early mortality of affected individuals to the much-needed limelight. Presently, questions about how these therapies will be used and what that means for ongoing pharmaceutical development remain.

AREAS COVERED

Here, we wish to highlight the current medications and treatments for SCD using already published literature as well as scrutinize the tedious process of implementation for these newly approved commercial genetic therapies.

EXPERT OPINION

In our expert opinion, despite the progress we have made, significant challenges remain and the most important requirement for any of these treatments is ensuring all affected individuals have access to a sickle cell specialist who can provide comprehensive care.

Utilization and Perceptions of Hydroxyurea Therapy Among Adult Patients With Sickle Cell Disease in Al Ahsa, Saudi Arabia: A Cross-Sectional Study

BACKGROUND

Sickle cell disease (SCD) is a prevalent genetic disorder characterized by abnormal hemoglobin formation, resulting in severe complications. Hydroxyurea (HU) therapy has demonstrated efficacy in reducing SCD-related complications; however, its utilization patterns and patient perceptions remain underexplored, particularly in the Al Ahsa region of Saudi Arabia.

OBJECTIVE

This cross-sectional study aimed to assess the prevalence of HU usage among adult patients with SCD in Al Ahsa; identify the barriers to starting, maintaining, and discontinuing HU therapy; and evaluate the patient-reported outcomes associated with its use.

METHODS

Data were collected through face-to-face surveys and medical record reviews of adult SCD patients attending outpatient clinics in the Hereditary Blood Diseases Center of Al Ahsa, Saudi Arabia, between December 2023 and March 2024. Descriptive statistics and inferential analyses were performed using SPSS version 26.

RESULTS

A total of 345 adult SCD patients were included, with a mean age of 34.12 ± 11.1 years. Most participants were male (58.6%) and unmarried (55.4%). HU utilization was reported by 57.1% of the participants, with the highest adherence observed among older age groups (p = 0.001). Significant improvements in pain severity, hospitalization rates, and quality of life were reported among HU users (p < 0.001). Common barriers to HU use included concerns about side effects, lack of medical justification, and absence of medical advice.

CONCLUSION

This study provides valuable insights into the utilization and perceptions of HU therapy among adults with SCD in Al Ahsa, Saudi Arabia. Addressing identified barriers and promoting patient education are crucial for optimizing therapy adherence and improving clinical outcomes in this population.

Optimizing the management of inherited blood disorders in a changing market: Findings from the AMCP Market Insights Program

In this market insights program, AMCP brought together a panel of experts representing various stakeholders: national and regional health plans, integrated health care systems, employer benefits groups, clinical experts, the Centers for Disease Control and Prevention, and patient advocacy organizations. The objectives were to gain insights into the current and evolving treatments in hemophilia, sickle cell disease, and β-thalassemia; measure the effects of recently approved therapies on clinicians, payers, and patients; recognize emerging trends within the stop-loss market; address potential issues and obstacles related to monitoring and reporting outcomes; and identify concerns associated with both existing and emerging contracting and reimbursement models. This article aims to summarize expert perspectives on health care system challenges and strategies concerning the management of inherited blood disorders and to advance managed care professionals' understanding of their role in supporting care for these patients. The experts emphasized that when shaping coverage policies, a patient-centered approach is crucial, focusing on preserving organ function to maintain eligibility for future gene therapies among individuals with inherited blood disorders. These strategies, including benefit design modifications, specialized provider networks, and centralized mechanisms like registries, are vital for evaluating effectiveness, facilitating decision-making, and managing costs and risks associated with new and emerging treatment options for inherited blood disorders.

A Pharmacist-Managed Hydroxyurea Prescribing Protocol Improves Uptake and Optimization among Patients with Sickle Cell Disease

Sickle cell disease (SCD) is a common genetic disorder with potentially serious sequelae that can be effectively treated with hydroxyurea. Despite its favorable benefit-risk profile, hydroxyurea uptake in patients with SCD is low. A pilot study was conducted at the Southern Alberta Rare Blood and Bleeding Disorders (SARBBDs) Comprehensive Care Program between January 2020 and September 2023 to assess the implementation of a pharmacist-led protocol for supporting the uptake of hydroxyurea among eligible patients with SCD and optimizing its dosing. The protocol standardized the prescription, monitoring, dose titration, and patient counselling by a clinic pharmacist. The number of patients enrolled in the SARBBDs program increased from 98 in January 2020 to 168 in 2023. During this period, the proportion of patients on hydroxyurea increased from 37.8% to 62.5%, the proportion of patients on hydroxyurea who were at a maximum tolerated dose (MTD) increased from 35.1% to 63.8%, and the average hemoglobin F level increased from 13.9% to 19.7%. The mean time to reach MTD was 10 months and required eight pharmacist interventions, six laboratory assessments, and three dose increases. Hydroxyurea continuation rates were high, with most discontinuations resulting from loss to follow-up or transition to a transfusion management strategy. This real-world pilot study demonstrated that implementation of a pharmacist-led prescribing and monitoring protocol nearly doubled hydroxyurea uptake and achievement of MTD in patients with SCD managed in a rare blood disorders clinic.

Understanding patient-related barriers to hydroxyurea use among adolescent and adult patients with sickle cell disease in Mulago and Kiruddu hospitals, Uganda, a qualitative study

BACKGROUND

In 2016, Uganda added Hydroxyurea (HU) to the list of essential drugs to treat sickle cell disease SCD. However, Hydroxyurea utilization has been low for several countries in sub-Saharan Africa. This study examined patient-related barriers to hydroxyurea use among adolescent and adult patients with sickle cell disease in Mulago and Kiruddu hospitals, in Uganda.

METHODS

To understand the patient-related barriers to hydroxyurea use among adolescent and adult patients with sickle cell disease, we conducted a parallel convergent mixed methods study at outpatient departments of two national referral hospitals in Uganda from October 2022 to January 2023. The cross-sectional mixed-methods study employed both quantitative and qualitative methods. We collected survey data from a systematic sample of 259 participants and conducted individual interviews with a purposive sample of 40 participants (20 adolescents or their caregivers and 20 adult patients with SCD) and interviewed them individually on their knowledge, perceptions, barriers, and facilitators of HU utilization. Descriptive data were analyzed using Stata 16, whereas qualitative data were analyzed thematically using an inductive approach supported by NVivo 12 software. We triangulated data to determine the concordance of qualitative and quantitative data.

RESULTS

The study enrolled 40 participants for qualitative interviews and 259 patients for quantitative, with an average age of 16, over half being female, 46% having secondary education, and 96% unmarried. The prevalence of HU use was 78%. The study identified three themes as follows: Patient barriers at the individual including Inadequate knowledge about HU, Persistent pain, Poor adherence to HU, Poor communication with health care workers, and Psychosocial and emotional challenges. At the facility level, long queues and poor quality of care, drug-related side effects that affect HU, and drug stock-outs were reported. Myths, rumors, and misconceptions about HU, and gender-related barriers were reported to affect HU utilization at a community level. Facilitators for the use of HU and recommendations for improvement. Facilitators included perceived benefits, long duration on HU, information sharing by healthcare workers, availability of complementary drugs, confirmation of diagnosis, and availability of medication at public health facilities or private pharmacies. Patients suggested continuous adherence support, encouragement from healthcare workers, sensitization about benefits and risks, a peer-to-peer approach, and financial support for adolescents and women to start businesses to resolve financial problems.

CONCLUSION

Implementing the use of HU has been challenging in Uganda and needs improvement. Facilitators to hydroxyurea use have been highlighted, though Patient-identified barriers at individual, facility, and community levels that need to be resolved. The experiences and insights shared by our participants provide invaluable guidance for increasing the uptake of HU. Further studies are needed to establish validated instruments to assess patients' pain communication and adherence to the HU regimen.

Looking ahead: ethical and social challenges of somatic gene therapy for sickle cell disease in Africa

Somatic gene therapy will be one of the most exciting practices of genetic medicine in Africa and is primed to offer a "new life" for persons living with sickle cell disease (SCD). Recently, successful gene therapy trials for SCD in the USA have sparked a ray of hope within the SCD community in Africa. However, the high cost, estimated to exceed 1.5 million USD, continues to be a major concern for many stakeholders. While affordability is a key global health equity consideration, it is equally important to reflect on other ethical, legal and social issues (ELSIs) that may impact the responsible implementation of gene therapy for SCD in Africa. These include informed consent comprehension, risk of therapeutic misestimation and optimistic bias; priorities for SCD therapy trials; dearth of ethical and regulatory oversight for gene therapy in many African countries; identifying a favourable risk-benefit ratio; criteria for the selection of trial participants; decisional conflict in consent; standards of care; bounded justice; and genetic tourism. Given these ELSIs, we suggest that researchers, pharma, funders, global health agencies, ethics committees, science councils and SCD patient support/advocacy groups should work together to co-develop: (1) patient-centric governance for gene therapy in Africa, (2) public engagement and education materials, and (3) decision making toolkits for trial participants. It is also critical to establish harmonised ethical and regulatory frameworks for gene therapy in Africa, and for global health agencies to accelerate access to basic care for SCD in Africa, while simultaneously strengthening capacity for gene therapy.

Sickle cell disease in Australia: a snapshot from the Australian Haemoglobinopathy Registry

BACKGROUND

Sickle cell disease (SCD) is the most common monogenic disorder worldwide. In deoxygenated conditions, the altered beta chain (haemoglobin S [HbS]) polymerises and distorts the erythrocyte, resulting in pain crises, vasculopathy and end-organ damage. Clinical complications of SCD cause substantial morbidity, and therapy demands expertise and resources. Optimising care for patients and planning resource allocation for the future requires an understanding of the disease in the Australian population. The Australian Haemoglobinopathy Registry (HbR) is a collaborative initiative of specialist centres collating and analysing data on patients with haemoglobin disorders.

AIMS

To provide a snapshot of SCD in Australia over a 12-month period based on data from the HbR.

METHODS

Patients with a clinically significant sickling disorder across 12 clinical sites were included for analysis. Data include demographic and diagnostic details, as well as details of the clinical management of the condition over a 12-month period.

RESULTS

Data on 359 SCD patients demonstrate a shift in the demographic of patients in Australia, with a growing proportion of sub-Saharan African ethnicities associated with the HbSS genotype. Acute and chronic complications are common, and patients require significant outpatient and inpatient support. Prevalence of disease complications and therapeutic trends are in keeping with other high-income countries.

CONCLUSIONS

This study provides the first national picture of SCD in Australia, describing the characteristics and needs of SCD patients, elucidating demand for current and novel therapy and facilitating the planning of services for this vulnerable population.

The Inequality of Pain Control in Patients With Pain From Sickle Cell Disease: A Case Report

Approximately 100,000 people in the United States are affected by Sickle Cell Disease (SCD). Acute pain and chronic pain are common and are experienced by everyone with SCD. Children and adolescents who had pain from SCD reported daily pain, decreased function, missed school/workdays, and limited participation in recreational and social activities. This case report aims to highlight the lack of diversity, equity, and inclusion of pain control through the lens of a patient with SCD to improve clinical practice.

The evolving treatment landscape for children with sickle cell disease

Sickle cell disease is the most common inherited pathological haemoglobinopathy. Over the past 30 years, disease-related morbidity and mortality have improved in high-income countries due to advances in preventive care and treatments. Established disease-modifying therapies, such as hydroxyurea (hydrocarbamide), are continuing to have an important role in the treatment of sickle cell disease, and newer agents also show promise. In the past 5 years, the US Food and Drug Administration approved three additional sickle cell disease-modifying medications, and new gene therapies have been developed as an alternative curative treatment to haematopoietic stem-cell transplantation. In this Review, we discuss the current treatment landscape for paediatric sickle cell disease and emerging innovations in care. We also review the need for close, long-term management for children receiving newer therapies and the importance of ongoing investment in people with sickle cell disease in low-income and middle-income countries.

The future of sickle cell disease therapeutics rests in genomics

Sickle cell disease (SCD) is the most-common monogenic recessive disease in humans, annually affecting almost 300,000 newborns worldwide, 75% of whom live in Africa. Genomics research can accelerate the development of curative therapies for SCD in three ways. First, research should explore the missing heritability of foetal haemoglobin (HbF) - the strongest known modifier of SCD clinical expression - among highly genetically heterogenous and understudied African populations, to provide novel therapeutics targets for HbF induction. Second, SCD research should invest in RNA therapies, either by using microRNA to target the production of HbF proteins by binding to the transcription machinery in a cell, or by directly mediating production of HbF or adult haemoglobin through injection of messenger RNA. Third, investigators should aim to identify currently unknown genetic risk factors for SCD cardiovascular complications, which will address mortality, particularly in adults. Now is the time for global research programs to uncover genomic keys to unlock SCD therapeutics.

Managing the Cerebrovascular Complications of Sickle Cell Disease: Current Perspectives

The importance of protecting brain function for people with sickle cell disease (SCD) cannot be overstated. SCD is associated with multiple cerebrovascular complications that threaten neurocognitive function and life. Without screening and preventive management, 11% of children at 24% of adults with SCD have ischemic or hemorrhagic strokes. Stroke screening in children with SCD is well-established using transcranial Doppler ultrasound (TCD). TCD velocities above 200 cm/s significantly increase the risk of stroke, which can be prevented using chronic red blood cell (RBC) transfusion. RBC transfusion is also the cornerstone of acute stroke management and secondary stroke prevention. Chronic transfusion requires long-term management of complications like iron overload. Hydroxyurea can replace chronic transfusions for primary stroke prevention in a select group of patients or in populations where chronic transfusions are not feasible. Silent cerebral infarction (SCI) is even more common than stroke, affecting 39% of children and more than 50% of adults with SCD; management of SCI is individualized and includes careful neurocognitive evaluation. Hematopoietic stem cell transplant prevents cerebrovascular complications, despite the short- and long-term risks. Newer disease-modifying agents like voxelotor and crizanlizumab, as well as gene therapy, may treat cerebrovascular complications, but these approaches are investigational.