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Asthma is a recognized comorbidity in children with sickle cell disease (SCD). It increases the risk of acute chest syndrome (ACS), vaso-occlusive episodes, and early mortality. We aim to determine whether evaluation and management of children with SCD and asthma by a pulmonologist reduce rate of asthma exacerbation and ACS.The study included 192 patients with SCD (0-21 years) followed at Children's Hospital of Philadelphia Hematology between January 1, 2015, and December 31, 2018, with a diagnosis of asthma, wheeze, or cough. Patients were placed in two groups: those evaluated by a pulmonologist (SCD-A-P) and those not (SCD-A). Rates of emergency department (ED) visits and hospitalizations for asthma exacerbation and ACS were compared between groups and over time.SCD-A-P patients (n = 70) were predominantly SCD type SS with lower hemoglobin and hematocrit compared to SCD-A patients (n = 122). SCD-A-P started with a higher average rate of hospital visits for asthma exacerbation and ACS per year (2.69 [1.02-4.37]) compared to SCD-A (0.43 [0.24-0.63]), (p 0.001). For SCD-A-P patients with at least one hospital visit (n = 48), the average rate decreased from 3.93 (1.57-6.29) to 0.85 (0.48-1.23) following pulmonary consultation (p = 0.014) and was comparable to the SCD-A rate by study end.SCD-A-P was mainly SCD type SS and had higher ED/hospitalization rates for asthma exacerbation and ACS compared to SCD-A, but the rates significantly decreased following pulmonology consultation. These findings support the pulmonologist's role in the multidisciplinary care of SCD patients and highlight the need for evidence-based asthma guidelines for children with SCD.

Sickle cell disease (SCD) requires coordinated, specialized medical care for optimal outcomes. There are no United States (US) guidelines that define a pediatric comprehensive SCD program. We report a modified Delphi consensus-seeking process to determine essential, optimal, and suggested elements of a comprehensive pediatric SCD center. Nineteen pediatric SCD specialists participated from the US. Consensus was predefined as 2/3 agreement on each element's categorization. Twenty-six elements were considered essential (required for guideline-based SCD care), 10 were optimal (recommended but not required), and five were suggested. This work lays the foundation for a formal recognition process of pediatric comprehensive SCD centers.

Sickle cell trait (SCT), a commonly asymptomatic condition, has many associated clinical complications that upon presentation, can be very difficult to attribute to SCT. The effects of SCT on the spleen, for example, are not completely understood, though there have been a number of case reports detailing related complications in diverse populations. Our objective was to perform the first comprehensive case report review of splenic infarction in SCT patients to highlight the relevance of this seemingly rare condition. We conducted an extensive literature search reviewing case reports and case series of acute splenic infarctions from 1970 to 2020. This comprehensive search resulted in 54 articles with a total of 85 individuals. The ages ranged from 7 to 65, 12% were female. Individuals were of African-American (26%), European (16%), South Asian (13%), Middle Eastern (7%), Latin American (7%), North or East African (4%), Mediterranean (4%), West African (1%), and unknown (22%) origins. Although splenic infarct in SCT patients has been associated with high altitudes, 39% of cases reporting altitude occurred below 3000 m. Among cases where HbS values were recorded, 88% occurred in individuals with HbS levels higher than 35%, suggesting that high HbS values may be a risk factor for splenic infarction. Our findings indicate that splenic infarct occurs across a wide range of demographic populations and environmental settings. While our understanding of SCT evolves, the findings here suggest that future advances in research and healthcare could benefit more from real-time surveillance and registry initiation for various SCT outcomes such as splenic infarct.

BACKGROUND: Adolescent and young adult (AYA) women with sickle cell disease (SCD) have increased pregnancy-related health risks and are prescribed potentially teratogenic medications, yet limited data are available regarding pediatric SCD provider contraceptive practices. We aimed to assess pediatric hematology providers’ beliefs, practices, motivators, and barriers for providing contraceptive care to female AYA with SCD. METHODS: Guided by the Health Belief Model (HBM), we developed a 25-question, web-based survey to assess practices. Survey links were distributed nation-wide to pediatric SCD and/or general hematology providers through their publicly available emails and by request to directors of U.S. accredited Pediatric Hematology-Oncology fellowship programs for distribution to their SCD providers. Data analysis included descriptive statistics, chi-square analysis, logistic regression. RESULTS: Of 177 respondents, 160 surveys meeting inclusion criteria were analyzed. Most providers reported counseling (77.5%) and referring female AYA patients for contraception (90.8%), but fewer reported prescribing contraception (41.8%). Proportionally fewer trainees provided counseling compared to established providers (54% vs. 85%, p

Children with sickle cell disease (SCD) have an increased risk for gallstones due to chronic hyperbilirubinemia from hemolysis. Although gallstones are a known complication, there is variability in estimates of disease burden and uncertainty in the association between sex and gall bladder disease (GBD).This was a retrospective cohort study of children with SCD using administrative claims data (January 1, 2014-December 31, 2018). Population-averaged multivariable panel-data logistic regression models were used to evaluate the association between GBD clinical encounters (outcome) and two exposures (age and sex). Annual GBD risk was calculated using predictive margins, adjusting for disease severity, transfusion frequency, and hydroxyurea exposure.A total of 13,745 individuals (of 21,487 possible) met inclusion criteria. The population was evenly split across sex (49.5% female) with predominantly Medicaid insurance (69%). A total of 946 individuals (6.9%) had GBD, 432 (3.1%) had a gallstone complication, and 487 (3.5%) underwent cholecystectomy. The annual risk of GBD rose nonlinearly from 1 to 5% between ages 1 and 19 years with no difference between males and females. Cholecystectomy occurred primarily in individuals with GBD (87%), and neither age nor sex was associated with cholecystectomy in this population. High disease severity (compared with low) more than doubled the annual risk of GBD at all ages.GBD is associated with age but not sex in children with SCD. Neither age nor sex is associated with risk of cholecystectomy. High disease severity increases the rate of GBD at all ages.

Introduction No study determined if vitamin D supplementation improves health-related quality of life (HRQL) using pediatric Patient-Reported Outcomes Measurement Information System or physical functioning in type SS sickle cell disease (HbSS). Method Subjects with HbSS (n = 21) and healthy subjects (n = 23) were randomized to daily oral doses (4,000 vs. 7,000 IU) of cholecalciferol (vitamin D3) and evaluated at 6 and 12 weeks for changes in serum 25 hydroxyvitamin D (25(OH)D), HRQL, and physical functioning. Results In subjects with HbSS, significant reductions in pain, fatigue, and depressive symptoms and improved upper-extremity function were observed. In healthy subjects, significant reductions in fatigue and improved upper-extremity function were observed. Significant improvements in peak power and dorsiflexion isometric maximal voluntary contraction torques were observed in both groups. In subjects with HbSS, improved plantar flexion isometric maximal voluntary contraction torques were observed. Both groups saw significant improvement in their total Bruininks-Oseretsky Test of Motor Proficiency score. Discussion Daily high-dose vitamin D supplementation for African American children with and without HbSS improved HRQL and physical performance.

β-thalassemia is a disorder caused by altered hemoglobin protein synthesis and affects individuals worldwide. Severe forms of the disease, left untreated, can result in death before the age of 3 years (1). The standard of care consists of chronic and costly palliative treatment by blood transfusion combined with iron chelation. This dual approach suppresses anemia and reduces iron-related toxicities in patients. Allogeneic bone marrow transplant is an option, but limited by the availability of a highly compatible HSC donor. While gene therapy is been explored in several trials, its use is highly limited to developed regions with centers of excellence and well-established healthcare systems (2). Hence, there remains a tremendous unmet medical need to develop alternative treatment strategies for β-thalassemia (3). Occurrence of aberrant splicing is one of the processes that affects β-globin synthesis in β-thalassemia. The (C>G) IVS-2-745 is a splicing mutation within intron 2 of the β-globin gene. It leads to an aberrantly spliced mRNA that incorporates an intron fragment. This results in an in-frame premature termination codon that inhibits β-globin production. Here, we propose the use of uniform 2'-O-methoxyethyl (2'-MOE) splice switching oligos (SSOs) to reverse this aberrant splicing in the pre-mRNA. With these lead SSOs we show aberrant to wild type splice switching. This switching leads to an increase of adult hemoglobin (HbA) up to 80% in erythroid cells from patients with the IVS-2-745 mutation. Furthermore, we demonstrate a restoration of the balance between β-like- and α-globin chains, and up to an 87% reduction in toxic α-heme aggregates. While examining the potential benefit of 2'-MOE-SSOs in a mixed sickle-thalassemic phenotypic setting, we found reduced HbS synthesis and sickle cell formation due to HbA induction. In summary, 2'-MOE-SSOs are a promising therapy for forms of β-thalassemia caused by mutations leading to aberrant splicing.

Sickle cell disease (SCD) is a devastating, multisystemic disorder that affects millions of people worldwide. The earliest clinical manifestations of SCD can affect infants as young as 6 months of age, and pediatric patients are at risk for acute and life-threatening complications. Early intervention with treatments that target the underlying pathophysiological mechanism of SCD, sickle hemoglobin (HbS) polymerization, are expected to slow disease progression and circumvent disease-associated morbidity and mortality.The HOPE-KIDS 1 trial (NCT02850406) is an ongoing four-part, phase 2a, open-label, single- and multiple-dose study to evaluate the pharmacokinetics, efficacy, and safety of voxelotor-a first-in-class HbS polymerization inhibitor-in patients aged 6 months to 17 years with SCD. Initial findings from a cohort of 45 patients aged 4 to 11 years who received voxelotor treatment for up to 48 weeks are reported.Hemoglobin (Hb) response, defined as a1.0 g/dl increase from baseline, was achieved at week 24 by 47% (n = 16/34) of patients with Hb measurements at baseline and week 24. At week 24, 35% (n = 12/34) and 21% (n = 7/34) of patients had a1.5 g/dl increase and a2.0 g/dl increase from baseline in Hb concentration, respectively. Concurrent improvements in hemolytic markers were observed. Voxelotor was well tolerated in this young cohort, with no newly emerging safety signals.Based on its mechanism as an HbS polymerization inhibitor, voxelotor improves Hb levels and markers of hemolysis and has the potential to mitigate SCD-related complications; these results support its use in patients aged ≥4 years.

Background Adolescent and young adult (AYA) women with sickle cell disease (SCD) have increased pregnancy-related health risks and are prescribed potentially teratogenic medications, yet little is known about pediatric SCD provider contraceptive practices. We aimed to assess pediatric hematology providers’ beliefs, practices, motivators, and barriers for providing contraceptive care to female AYA with SCD. Methods Guided by the Health Belief Model (HBM), we developed a 25-question, web-based survey to assess providers’ practices. Survey links were distributed nation-wide to pediatric SCD and/or general hematology providers through their publicly available emails and by request to directors of U.S. accredited Pediatric Hematology-Oncology fellowship programs for distribution to their SCD providers. Data analysis included descriptive statistics, chi-square analysis, logistic regression. Results Of 177 respondents, 160 surveys meeting inclusion criteria were analyzed. Most providers reported counseling (77.5%) and referring female AYA patients for contraception (90.8%), but fewer reported prescribing contraception (41.8%). Counseling practices significantly differed in trainees versus established providers (54% vs. 85%, p

Youth with sickle cell disease (SCD) and their caregivers are susceptible to stress and depression, perhaps exacerbated by pandemic-associated health and economic concerns. Most of the 50 youth-caregiver dyads enrolled in the multisite trial, Hydroxyurea Adherence for Personal Best in Sickle Cell Treatment (HABIT), took an online survey of self-reported mental health symptoms and food insecurity during the 2020 COVID-19 pandemic. Compared to largely pre-pandemic results, prevalence of mental health symptoms in dyad members appeared to have shifted: fewer youth and more caregivers were affected during the pandemic; many of both groups lacked optimism. Pandemic/post-pandemic screening of youth with SCD for mental health symptoms and food insecurity appears warranted.

Background: SCD is an inherited blood disorder characterized by hemolytic anemia, endothelial damage and acutely painful VOCs that cause chronic and potentially life-threatening complications. P-selectin is an adhesion protein that plays a key role in the multicellular interactions leading to a VOC. The Phase II SUSTAIN study showed that crizanlizumab (SelG1), a humanized monoclonal anti-P-selectin antibody, reduced the annualized rate of VOCs leading to a healthcare visit by 45.3% vs placebo (P=0.01) in SCD patients (pts) [Ataga K et al. N Engl J Med 2017]. Aims: To evaluate the pharmacokinetics (PK) and pharmacodynamics (PD; ex vivo P-selectin inhibition) of crizanlizumab (SEG101), as well as safety and efficacy in SCD pts with a history of VOCs. Methods: SOLACE-adults is a Phase II, multicenter, open-label PK-PD study that enrolled SCD pts aged 16-70 years who had experienced ≥1 VOC in the 12 months prior to study start (NCT03264989). Pts received crizanlizumab by intravenous infusion over 30 minutes at 5.0 mg/kg or 7.5 mg/kg on: Week 1, Day 1 (Wk1D1); Wk3D1; and then on D1 of every 4-wk cycle. PK and PD assessments were performed in all pts pre- and post-dose on days 1, 2, 4, 8, and 15 of the first dose (Wk1D1) and then on days 1, 2, 4, 8, 15, 22 and 29 of the fifth dose (Wk15D1). Adverse events (AEs) were evaluated based on MedDRA v22.1 and AE severity based on CTCAE v5.0. Pts were continuously monitored for VOCs, with the relevant medical and treatment information collected in case of occurrence. Results: A total of 57 pts were enrolled: 45 received crizanlizumab 5.0 mg/kg (female, n=25 [56%]; mean [SD] age, 32 [13] years) for a median of 65 (range, 6-90) wks and 12 received 7.5 mg/kg (female, n=6 [50%]; mean [SD] age, 27 [12] years) for a median of 43 (range, 9-49) wks. In the 5.0 and 7.5 mg/kg arms, respectively, 6 (13%) and 2 (17%) pts discontinued treatment, primarily because of patient decision (n=4; 9%) in the 5.0 mg/kg arm and because of death and AE (both n=1; 8%) in the 7.5 mg/kg arm. The most common AEs were headache (5.0 mg/kg, n=11 [24%]; 7.5 mg/kg, n=3 [25%]) and pyrexia (5.0 mg/kg, n=9 [20%]; 7.5 mg/kg, n=2 [17%]). Grade ≥3 AEs occurred in 18 (40%) pts in the 5.0 mg/kg arm and in 2 pts (17%) in the 7.5 mg/kg arm. Serious AEs were reported in 11 pts (24%) in the 5.0 mg/kg arm and in 1 pt (8%) in the 7.5 mg/kg arm; none were deemed drug-related. One pt in each of the 5.0 (2%) and 7.5 mg/kg (8%) arms discontinued treatment because of AEs. Infections, infusion-related reactions (IRR), bleeding events, and immunogenicity were AEs of special interest. Infections were reported in 20 (44%) and 3 (25%) pts in the 5.0 and 7.5 mg/kg arms, respectively; none were considered drug-related. Signs and symptoms indicative of IRRs were reported in 15 (33%) and 2 (17%) pts in the 5.0 and 7.5 mg/kg arms, respectively; none were grade 3/4 severity or led to treatment withdrawal. Bleeding events were rare, and none were deemed serious. No pts developed immunogenicity. For both doses, serum crizanlizumab concentrations increased to nearly maximum levels (Cmax) at the end of the 30-minute infusion, remaining steady for 6 hours post-infusion (Figure). For each dose, Cmax at wks 1 and 15 were similar (Table), indicating a lack of accumulation. The increase in exposure to crizanlizumab in the 5.0 and 7.5 mg/kg arms was almost dose-proportional. Ex vivo inhibition of P-selectin binding to its receptor was complete throughout the dosing interval for both crizanlizumab doses (Figure). Pre-dose PK and PD were consistent and stable throughout the study. The median (range) annualized rate of VOCs leading to a healthcare visit in the 5.0 mg/kg arm was 4.0 (1.0-25.0) at baseline and 2.8 (0.0-21.7) on treatment (median [range] absolute change from baseline, -0.97 [-14.4 to 17.7]). In the 7.5 mg/kg arm, the corresponding rates were 2.0 (1.0-9.0) and 1.8 (0.0-7.0) [median (range) absolute change from baseline, -0.80 (-3.7 to 1.0)]. Seven pts (16%) in the 5.0 mg/kg arm and 4 pts (33%) in the 7.5 mg/kg arm were VOC-free during the treatment period. Conclusions: No new safety signals were identified in this SCD population treated with crizanlizumab, with no apparent differences between the 5.0 and 7.5 mg/kg doses in the frequency and severity of AEs. For both doses, serum crizanlizumab concentrations rose to a near maximum level shortly after infusion. Consistent with results from the SUSTAIN trial, crizanlizumab reduced from baseline the annualized rate of VOCs leading to a healthcare visit. Disclosures Smith-Whitley: Global Blood Therapeutics: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees; Prime: Other: Education material; Celgene: Membership on an entity's Board of Directors or advisory committees. Brown:Global Blood Therapeutics: Membership on an entity's Board of Directors or advisory committees, Research Funding; Imara, Inc: Consultancy, Research Funding; Novartis: Consultancy, Research Funding; Forma Therapeutics: Research Funding. Shah:Alexion: Speakers Bureau; Novartis: Consultancy, Research Funding, Speakers Bureau; Global Blood Therapeutics: Consultancy, Research Funding, Speakers Bureau; CSL Behring: Consultancy; Bluebird Bio: Consultancy. Tanaka:Novartis Institute for Biomedical Research: Current Employment, Current equity holder in publicly-traded company. Sanchez-Olle:NOVARTIS PHARMA AG: Current Employment. Albers:Novartis Pharma AG: Current Employment, Current equity holder in publicly-traded company. Kanter:Guidepoint Global: Honoraria; GLG: Honoraria; Jeffries: Honoraria; Cowen: Honoraria; Wells Fargo: Honoraria; NHLBI Sickle Cell Advisory Board: Membership on an entity's Board of Directors or advisory committees; SCDAA Medical and Research Advisory Board: Membership on an entity's Board of Directors or advisory committees; AGIOS: Membership on an entity's Board of Directors or advisory committees; BEAM: Membership on an entity's Board of Directors or advisory committees; Novartis: Consultancy; bluebird bio, inc: Consultancy, Honoraria; Sanofi: Consultancy; Medscape: Honoraria.

Background For patients with sickle cell disease (SCD), shared learning, understanding, and decision-making with their healthcare providers (HCPs) is critical for achieving treatment goals. Using a validated collaborative learning model (Sapir 2017), we evaluated patient and HCP perceptions of shared decision-making (SDM) related to SCD treatment. Methods In June 2020, 113 patients/caregivers of patients with SCD and 30 HCPs participated in 3 live, virtual collaborative learning sessions developed with the Sickle Cell Disease Association of America (Table 1). Before and after the sessions, patients and their HCPs completed tethered surveys to assess alignments and discordances in preferences, experiences, and concerns around SCD treatment and SDM. Results Patients and HCPs held discordant beliefs about the degree of patients' progress toward treatment goals. While HCPs estimated that only 29% of their patients are on track to meet their goals, 85% of patients reported that they felt somewhat (39%) or fully (46%) on track. The magnitude of this discrepancy suggests that patients may not be aware of treatment milestones they are not reaching. Participants differed in their perceptions of how often HCPs engage patients in SDM (Figure 1). Relative to patients' estimates, HCPs were more likely to report that they usually or always: ask about the patient's goals for treatment (41% vs 61%), work with the patient to create a treatment plan (47% vs 55%), explain their own goals for the patient's treatment (47% vs 55%), and explain the pros/cons of each treatment choice (47% vs 55%). The biggest missed opportunity for SDM involved how often HCPs ask patients about stigma related to opioids for pain management (28% vs 35%). The reported lack of communication around stigma may contribute to providers' underestimation of how often their patients encounter stigma. HCPs estimated that 47% of their patients have faced barriers to adequate pain management in the ER due to opioid stigma and/or poor knowledge of pain crises among ER staff. By comparison, 74% of patients reported ever feeling that ER doctors, nurses, or staff questioned their need for pain medication during a pain crisis (20% once; 54% more than once). When asked why patients are not more involved in SDM (Figure 2), HCPs were more likely to select patient factors: feeling too overwhelmed to make treatment decisions (52% HCPs, 14% patients), low health literacy (49% HCPs, 12% patients), and lack of confidence in validity of opinions/concerns (44% HCPs, 10% patients). In contrast, patients were more likely to report that they are completely involved in treatment decisions (40% patients, 4% HCPs) and that they trust their care team to make decisions on their behalf (37% patients, 30% HCPs). Regarding adjusting SCD therapy, HCPs overestimated how many patients were concerned about learning a new routine/schedule (23% HCPs, 7% patients), but underestimated concerns about being able to pay for it (4% HCPs, 9% patients). HCPs correctly estimated concerns about knowing whether treatment will work (33% HCPs, 34% patients), fear of side effects (29% HCPs, 25% patients), and knowing how to manage a pain episode (9% HCPs, 9% patients). Overall, HCPs underestimated how many patients would not worry about switching treatment (1% HCPs, 9% patients). Following the collaborative learning sessions, patients made commitments to talk to their care team about their treatment goals (52%), consider treatment options more closely (50%), take a more active role in decision-making (46%), and notify their care team with concerns (41%). HCPs set goals to increase the types of educational materials they provide (57%), attempt to ease the transition to the adult care setting (50%), engage their patients more frequently in SDM (47%), and train colleagues on how to conduct additional learning sessions (34%). The full data set with 2 additional learning sessions (Aug 2020) will be presented. Conclusions Patients with SCD and their care teams differed in their experiences and beliefs related to SDM. Collaborative education can reveal opportunities for greater understanding and facilitate improved patient-provider communication, leading to greater engagement in SDM around SCD treatment. Study Sponsor Statement The study reported in this abstract was funded by an independent educational grant from bluebird bio. The grantor had no role in the study design, execution, analysis, or reporting. Disclosures Smith-Whitley: Prime: Other: Education material; Novartis: Membership on an entity's Board of Directors or advisory committees; Global Blood Therapeutics: Membership on an entity's Board of Directors or advisory committees; Celgene: Membership on an entity's Board of Directors or advisory committees.

Suboptimal vitamin A status (serum retinol

Uptake of prenatal genetic testing (PGT) is low among those with sickle cell disease (SCD). This study evaluated the association of knowledge and attitudes towards prenatal genetic counseling (PGC), awareness of posttesting intervention options and omission bias with attitudes towards PGT. In addition, we explored changes among knowledge, attitudes, and awareness of options following exposure to an educational, clinical vignette among parents of children with SCD. Parents (n=44) completed a questionnaire and an educational, clinical vignette presenting a detailed account of a pregnant woman with sickle cell trait seeking PGT and PGC was read to each participant. t Tests, Spearman correlations, multivariable regressions, and moderation/mediation analyses were used. More positive attitudes towards PGC (P=0.01), lesser tendency of omission bias (P

Background: Pulmonary complications of sickle cell disease (SCD) are diverse and encompass acute and chronic disease. The understanding of the natural history of pulmonary complications of SCD is limited, no specific therapies exist, and these complications are a primary cause of morbidity and mortality. Methods: We gathered a multidisciplinary group of pediatric and adult hematologists, pulmonologists, and emergency medicine physicians with expertise in SCD-related lung disease along with an SCD patient advocate for an American Thoracic Society–sponsored workshop to review the literature and identify key unanswered clinical and research questions. Participants were divided into four subcommittees on the basis of expertise: 1) acute chest syndrome, 2) lower airways disease and pulmonary function, 3) sleep-disordered breathing and hypoxia, and 4) pulmonary vascular complications of SCD. Before the workshop, a comprehensive literature review of each subtopic was conducted. Clinically important questions were developed after literature review and were finalized by group discussion and consensus. Results: Current knowledge is based on small, predominantly observational studies, few multicenter longitudinal studies, and even fewer high-quality interventional trials specifically targeting the pulmonary complications of SCD. Each subcommittee identified the three or four most important unanswered questions in their topic area for researchers to direct the next steps of clinical investigation. Conclusions: Important and clinically relevant questions regarding sickle cell lung disease remain unanswered. High-quality, multicenter, longitudinal studies and randomized clinical trials designed and implemented by teams of multidisciplinary clinician-investigators are needed to improve the care of individuals with SCD.

There is an immediate need to address long-standing questions about the reproductive health of girls and women with sickle cell disease (SCD). There are many SCD-related reproductive risks and uncertainties across girls' and women's reproductive life span, with particularly outstanding concerns about menstruation, contraception, fertility and pregnancy. Extant literature addressing women's reproductive health topics is mostly descriptive; there are few high-quality interventional studies. In 2020, the Centers for Disease Control and Prevention and the Foundation for Women and Girls with Blood Disorders convened an expert panel to assess the knowledge gaps in women's reproductive health in SCD. The panel identified significant limitations to clinical care due to the need for research. The panel also identified prominent barriers to research and care. In this report, we frame these issues, providing a roadmap for investigators, funding agencies, and policy makers to advance care for girls and women with SCD.

Background Sickle cell anemia (SCA) is a genetic blood disorder that puts children at a risk of serious medical complications, early morbidity and mortality, and high health care utilization. Until recently, hydroxyurea was the only disease-modifying treatment for this life-threatening disease and has remained the only option for children younger than 5 years. Evidence-based guidelines recommend using a shared decision-making (SDM) approach for offering hydroxyurea to children with SCA (HbSS or HbS/β0 thalassemia) aged as early as 9 months. However, the uptake remains suboptimal, likely because caregivers lack information about hydroxyurea and have concerns about its safety and potential long-term side effects. Moreover, clinicians do not routinely receive training or tools, especially those that provide medical evidence and consider caregivers’ preferences and values, to facilitate a shared discussion with caregivers. Objective The aim of this study is to understand how best to help parents of young children with sickle cell disease and their clinicians have a shared discussion about hydroxyurea (one that considers medical evidence and parent values and preferences). Methods We designed our study to compare the effectiveness of two methods for disseminating hydroxyurea guidelines to facilitate SDM: a clinician pocket guide (ie, usual care) and a clinician hydroxyurea SDM toolkit (H-SDM toolkit). Our primary outcomes are caregiver reports of decisional uncertainty and knowledge of hydroxyurea. The study also assesses the number of children (aged 0-5 years) who were offered and prescribed hydroxyurea and the resultant health outcomes. Results The Ethics Committee of the Cincinnati Children’s Hospital Medical Center approved this study in November 2017. As of February 2021, we have enrolled 120 caregiver participants. Conclusions The long-term objective of this study is to improve the quality of care for children with SCA. Using multicomponent dissemination methods developed in partnership with key stakeholders and designed to address barriers to high-quality care, caregivers of patients with SCA can make informed and shared decisions about their health. Trial Registration ClinicalTrials.gov NCT03442114; https://clinicaltrials.gov/ct2/show/NCT03442114 International Registered Report Identifier (IRRID) DERR1-10.2196/27650

Introduction Females with sickle cell disease now have a life expectancy that extends well into and beyond their reproductive years. Pregnancy and childbirth are accompanied by high morbidity and mortality in this population, rendering contraception a critical part of their health care. Methods We approached adult female patients of the Hospital of the University of Pennsylvania hematology clinic who were of reproductive age (ages 18–45) and carried a diagnosis of sickle cell disease. We evaluated contraceptive method uptake and method characteristic preferences, as well as other reproductive history, and compared contraceptive uptake rates to that from female respondent data from the National Survey of Family Growth (2017–2019). Results Of 95 eligible patients, we completed surveys with 48 participants (response rate of 51%). Over half (n = 27, 56%) of participants were not currently using any form of contraception—double the rate of the general United States population (25%). The most common contraceptives currently used were the depot medroxyprogesterone (DMPA) injection (n = 6, 13%) and the progestin intrauterine device (IUD) (n = 6, 13%). DMPA uptake was significantly higher, and permanent contraceptive and oral contraceptive pill uptake significantly lower, among these participants with sickle cell disease compared to the general United States population. Participants’ preferred contraceptive characteristics included effectiveness (n = 39, 81%), control over when to use the contraceptive (n = 39, 81%), and lack of side effects (n = 38, 79%). Conclusions Contraceptive uptake was significantly lower and method mix different among females with sickle cell disease compared to the general United States population. Further research is needed on contraceptive safety, non-contraceptive benefits, and contraceptive decision-making for females with sickle cell disease. Implications This study sheds light on the contraceptive choices and preferences of females with sickle cell disease, who are at disproportionate risk for pregnancy complications. In order to maximize the reproductive health of females with sickle cell disease, we must consider how their disease interacts with contraception and better understand how they approach contraceptive decision-making.

BACKGROUND Sickle cell anemia (SCA) is a genetic blood disorder that puts children at a risk of serious medical complications, early morbidity and mortality, and high health care utilization. Until recently, hydroxyurea was the only disease-modifying treatment for this life-threatening disease and has remained the only option for children younger than 5 years. Evidence-based guidelines recommend using a shared decision-making (SDM) approach for offering hydroxyurea to children with SCA (HbSS or HbS/β0 thalassemia) aged as early as 9 months. However, the uptake remains suboptimal, likely because caregivers lack information about hydroxyurea and have concerns about its safety and potential long-term side effects. Moreover, clinicians do not routinely receive training or tools, especially those that provide medical evidence and consider caregivers’ preferences and values, to facilitate a shared discussion with caregivers. OBJECTIVE The aim of this study is to understand how best to help parents of young children with sickle cell disease and their clinicians have a shared discussion about hydroxyurea (one that considers medical evidence and parent values and preferences). METHODS We designed our study to compare the effectiveness of two methods for disseminating hydroxyurea guidelines to facilitate SDM: a clinician pocket guide (ie, usual care) and a clinician hydroxyurea SDM toolkit (H-SDM toolkit). Our primary outcomes are caregiver reports of decisional uncertainty and knowledge of hydroxyurea. The study also assesses the number of children (aged 0-5 years) who were offered and prescribed hydroxyurea and the resultant health outcomes. RESULTS The Ethics Committee of the Cincinnati Children’s Hospital Medical Center approved this study in November 2017. As of February 2021, we have enrolled 120 caregiver participants. CONCLUSIONS The long-term objective of this study is to improve the quality of care for children with SCA. Using multicomponent dissemination methods developed in partnership with key stakeholders and designed to address barriers to high-quality care, caregivers of patients with SCA can make informed and shared decisions about their health. CLINICALTRIAL ClinicalTrials.gov NCT03442114; https://clinicaltrials.gov/ct2/show/NCT03442114 INTERNATIONAL REGISTERED REPORT DERR1-10.2196/27650

Introduction: Youth with sickle cell disease (SCD) and their families are susceptible to stress and depression associated with chronic illness and social factors disproportionately affecting under-resourced U.S. communities. The COVID-19 pandemic has adversely impacted psychosocial and economic well-being, especially in some of these same communities. Our concurrent HABIT multi-site randomized trial aims to improve hydroxyurea adherence in youth with SCD ages 10-18 years through an intervention led by community health workers(NCT03462511). Subjects enrolled as youth-primary caretaker dyads; adults were mostly parents. We hypothesized that some HABIT subjects had depressive symptoms at baseline, and many had additional stressors during the pandemic. Methods: Two self-reported assessment tools were used, with options of English or Spanish: 1) PROMIS® pediatric (8a, v1.0) or adult (4a, v1.0) depression measures, completed at HABIT enrollment, nearly all between May 2018 - March 2020 ("baseline"); 2) A pandemic-related open-access survey originated by Johns Hopkins University on established core adult mental health assessed risks and behaviors.[1] Questions were closely adapted for use by youth. The pandemic survey assessed recent mental health symptoms and substance or domestic abuse. Two validated food insecurity screening questions were added.[2] Of 92 HABIT subjects, 84 were offered survey participation between May - July, 2020. Participants completed both assessment tools via electronic linkage to REDCap data capture. Analyses used chi square or Fisher exact test. Results: In all, 75% (63 of 84) responded to the pandemic survey; 31 were youth-parent dyads and one unpaired parent. Baseline demographics were: Youth (N=31): mean age 12.9±1.9 years, 48.4% female, 80.6% grade 6-12, 45.3% hospitalized within the prior 12 months; Caretakers (N=32): mean age 44.0±9.6 years, 87.5% Black, 18.8% Latinx, 37.50% married or living with a partner, 59.4% with at least some college education. At baseline, youth mean PROMIS® Depression T-Score was 49.9±10.1 (normal Conclusions: In this sample of subjects from the HABIT Trial, at baseline a higher proportion of youth had depressive symptoms compare to their primary caretakers. During the initial pandemic peak in the Northeast, disrupted work arrangements and especially school cancellation were widespread. Fewer youth but similar proportions of caretakers reported feeling depressed and/or anxious. Both groups commonly reported loneliness or not feeling hopeful for the future. History of mental health conditions, current substance use/abuse or verbal abuse were uncommon. Concordant with concerns for under-resourced communities, a sizeable minority of families reported food insecurity. Under the limitations of using 2 different assessment tools, in this modest sample the majority of youth with SCD but not caretakers were mildly-moderately depressed at baseline and that, during the pandemic, the 2 groups reported similar proportions of mental health symptoms. These findings suggest that screening for mental health symptoms, social disruption and food insecurity may be warranted in this high-risk group overall and during the pandemic. References: 1) COVID-19 and mental health measurement working group, Johns Hopkins Bloomberg School of Public Health, March 18, 2020 2) Barnidge E., et al., Screening for Food Insecurity in Pediatric Clinical Settings. J. Community Health 42(1):51-57, 2017 The HABIT Trial is supported by 5R01NR017206-04 (Green, Smaldone). The authors have no conflicts to disclose. Disclosures Smith-Whitley: Novartis: Membership on an entity's Board of Directors or advisory committees; Global Blood Therapeutics: Membership on an entity's Board of Directors or advisory committees; Prime: Other: Education material; Celgene: Membership on an entity's Board of Directors or advisory committees. Aygun:bluebird bio: Membership on an entity's Board of Directors or advisory committees, Research Funding; National Institute of Nursing Research: Research Funding; Patient-Centered Outsomes Research Institute: Research Funding; National Heart, Lung, and Blood Institute: Research Funding.

Ongoing clinical trials for treatment of beta-globinopathies by gene therapy involve the transfer of the beta-globin gene, which requires integration of three to four copies per genome in most target cells. This high proviral load may increase genome toxicity, potentially limiting the safety of this therapy and relegating its use to total body myeloablation. We hypothesized that introducing an additional hypersensitive site from the locus control region, the complete sequence of the second intron of the beta-globin gene, and the ankyrin insulator may enhance beta-globin expression. We identified a construct, ALS20, that synthesized significantly higher adult hemoglobin levels than those of other constructs currently used in clinical trials. These findings were confirmed in erythroblastic cell lines and in primary cells isolated from sickle cell disease patients. Bone marrow transplantation studies in beta-thalassemia mice revealed that ALS20 was curative at less than one copy per genome. Injection of human CD34(+) cells transduced with ALS20 led to safe, long-term, and high polyclonal engraftment in xenograft experiments. Successful treatment of beta-globinopathies with ALS20 could potentially be achieved at less than two copies per genome, minimizing the risk of cytotoxic events and lowering the intensity of myeloablation.

In African-American children aged 5 to 17 years with and without type SS sickle cell disease (SCD-SS), dominant hand maximal handgrip strength, peak power, and plantar flexion isometric maximal voluntary contraction (MVC) torque were compared with adjustments for body size and composition. Children with SCD-SS (n=21; age, 11±1 y) compared with healthy control children (n=23; 10±1 y) did not differ by age, sex, or maturation stage, but had significantly lower Z scores for height, weight, body mass index, arm circumference, upper arm muscle area, and lean mass-for-height. Children with SCD-SS had significantly lower unadjusted handgrip strength (16±2 vs. 23±2 kg, P

Background and objective Recurrent hospital admissions for patients with sickle cell disease (SCD) are costly and contribute to a low quality of life for patients. We implemented a clinical pathway to safely discharge SCD patients with fever who are evaluated in the emergency department (ED) of a large tertiary care center. Methods An interdisciplinary team of ED and hematology physicians, nurses, and an improvement advisor developed a clinical pathway that identified febrile SCD patients at low risk of serious bacterial infection based on historical, clinical, and laboratory criteria who could be discharged from the ED. Phone follow-up was planned through the use of an automated electronic notification that was sent to an established hematology follow-up pool at the time of ED discharge. We conducted two "fake front end" trials in the ED to receive feedback on our process before full implementation. A postpathway implementation quality improvement team monitored discharge rates, phone follow-up rates and adverse events. Results In the first 9 weeks postpathway implementation, 100 SCD patients were evaluated for fever; 84 (24%) met low-risk criteria and were discharged home. This reduction in admission rate has been maintained throughout the 3 years postimplementation. Successful phone follow-up was achieved in all discharged patients within 24 hours and no adverse events were identified. Conclusions Low-risk febrile patients with SCD can be safely discharged from the ED. An automated notification system within the electronic medical record system can facilitate patient follow-up after ED discharge. Future quality improvement efforts aimed to further reduce admissions in this population should target patients with modifiable risk factors for serious bacterial infection.

Background: Hydroxyurea (HU) is the primary medication used to prevent the significant medical and neurologic morbidities of pediatric sickle cell disease (SCD; HbSS or HbSB0 thalassemia). Despite the benefits of HU, it remains under-utilized likely due to lack of clinician knowledge/training and negative caregiver perceptions. Thus, we developed the Engage-HU randomized controlled trial (NCT03442114) as a novel approach to address HU utilization barriers. Engage-HU is designed to assess how clinicians can engage caregivers in a shared discussion that considers their values, preferences, and scientific evidence about HU. The COVID-19 pandemic has resulted in significant changes to healthcare delivery for children with SCD, as they are at increased risk of severe illness from COVID-19 infection. Given their risk status, it was recommended that patients with SCD complete telehealth visits when possible. Some families also chose to delay care because they feared their child would get infected at hospitals/healthcare clinics that care for COVID-19 positive patients. Since the lives of all families enrolled in the Engage-HU trial have been affected to some extent, we incorporated measures to capture the impact of the COVID-19 pandemic and the usability of telemedicine implementation and services. Methods: Engage-HU is a randomized control trial comparing two dissemination methods for clinicians to facilitate shared decision-making with caregivers of young children with SCD. Study outcomes include caregiver confidence in decision-making and perceptions of experiencing shared decision-making as well as HU uptake and child health outcomes. Eligible children are 0 to 5 years, candidates for HU, and their caregiver has not decided about HU in the past 3 months. The trial is being conducted at 9 sites in the United States and uses a unidirectional crossover design. The primary endpoints are caregiver decisional uncertainty and caregiver perception of shared decision-making measured using validated tools. Data will be analyzed using the intent-to-treat principle, and all participants will remain in the arm to which they were randomized. A multiple group comparison analysis will be performed to assess significant response variable differences by group randomization. The Engage-HU study aims to recruit 174 caregivers who are considering initiating HU. The trial is being conducted at 9 sites in the United States. Data collection is ongoing, and 160 caregiver-participants have been enrolled to date. Since May 2020, caregiver-participants have completed the COVID-19 Exposure and Family Impact Scales (CEFIS), which contain 2 subscales (exposure to potentially traumatic aspects of the pandemic, impact on families), and the COVID-19 telemedicine use survey during a study visit. Results: Currently, 8 of the 9 sites have collected data from 48 caregivers (93.8% mothers), most of whom (93.8%) identify as African American/Black (see Figure 1). Correlations indicated that older caregivers experienced greater exposure (Mean = 7.0, SD = 4.1, range = 1-19) to potentially traumatic aspects of the pandemic (r = .31, p = .04). Distress related to COVID-19 varied widely across the sample, for both caregivers (Mean = 5.9, SD = 2.9, range = 1-10) and children (Mean = 4.1, SD = 3.4, range = 1-10). Scores on the telemedicine usability survey were generally high, indicating that caregivers are happy with the quality of care delivered via telehealth. However, caregivers (r = .30, p = .09) and children (r = .32, p = .07) experiencing more pandemic-related distress reported less satisfaction with telehealth. Conclusion: Although Engage-HU has resumed research operations, recruitment has not reached pre-pandemic targets, as fewer eligible patients are scheduled for routine care visits at SCD clinics. Our preliminary analyses suggest a significant continued impact of the pandemic on families and general satisfaction with the quality of healthcare delivered via telemedicine. These findings indicate that targeted screenings to identify and intervene for those who demonstrate more COVID-19 pandemic-related distress are needed. Figure 1 Figure 1. Disclosures Quinn: Forma Therapeutics: Consultancy; Aruvant: Research Funding; Novo Nordisk: Consultancy; Emmaus Medical: Research Funding. Yates: Agios Pharmaceuticals: Current Employment. Badawy: Sanofi Genzyme: Consultancy; Vertex Pharmaceuticals Inc: Consultancy; Bluebird Bio Inc: Consultancy. Thompson: bluebird bio, Inc.: Consultancy, Research Funding; Baxalta: Research Funding; Biomarin: Research Funding; Celgene/BMS: Consultancy, Research Funding; CRISPR Therapeutics: Research Funding; Vertex: Research Funding; Editas: Research Funding; Graphite Bio: Research Funding; Novartis: Research Funding; Agios: Consultancy; Beam: Consultancy; Global Blood Therapeutics: Current equity holder in publicly-traded company. Smith-Whitley: Global Blood Therapeutics: Current Employment. King: National Cancer Institute: Research Funding; National Heart, Lung, and Blood Institute: Research Funding; Health Resources and Services Administration: Research Funding; Global Blood Therapeutics: Research Funding. Meier: CVS Caremark: Consultancy; Forma Therapeutic: Membership on an entity's Board of Directors or advisory committees; NovoNordisk: Membership on an entity's Board of Directors or advisory committees; Novartis,: Other: Data Safety Monitoring Board membership; NHLBI: Other: Data Safety Monitoring Board membership; Global Blood Therapeutics: Other: Steering Committee membership, grant funding; CDC,: Other: grant funding; Indiana Department of Health: Other: grant funding . Tubman: Global Blood Therapeutics: Consultancy, Research Funding; Novartis Pharmaceuticals: Honoraria, Research Funding; Forma Pharmaceuticals: Consultancy; Perkin Elmer: Honoraria. Crosby: Forma Therapeutics: Honoraria; PCORI: Research Funding; HRSA: Research Funding; Global Blood Therapeutics Panel: Honoraria; Children's Hospital of Philadelphia: Honoraria; Professional Resource Exchange: Patents & Royalties: $30-$60 every other year; SCDAA: Honoraria; NHLBI: Other: Payment for review of LRP Proposals, Research Funding. OffLabel Disclosure: Hydroxyurea has been FDA approved for the treatment of sickle cell disease for patients ages 2 years and above but NHLBI and ASH Guidelines recommend it be offered to children as young as age 9 months.

Background: Sickle cell disease (SCD) is caused by polymerization of sickle hemoglobin (HbS), resulting in red blood cell (RBC) sickling, RBC destruction, vaso-occlusion and end-organ damage. GBT021601 is an oral, small molecule, next-generation HbS polymerization inhibitor. Similar to voxelotor, the first generation HbS polymerization inhibitor, GBT021601 increases hemoglobin-oxygen (Hb-O2) affinity and stabilizes hemoglobin (Hb) in the oxy-hemoglobin (oxyHb) state, thereby inhibiting polymerization of HbS in RBCs. The fraction of Hb bound to drug - (Hb occupancy) approximates the oxyHb molecules per RBC. Compared to voxelotor, GBT021601 has the potential to achieve higher Hb occupancies. GBT021601 achieves greater exposures per dose and is more potent as measured by improvements in hematological parameters in an in vivo SCD mouse model (Dufu, Kobina 2020). We hypothesized that GBT021601 would achieve a substantial reduction in RBC hemolysis and increase in hemoglobin while maintaining a favorable safety profile. We therefore explored safety, tolerability, pharmacokinetics (PK) and pharmacodynamics (PD) in healthy volunteer participants (HVs) and adults living with SCD. Methods: Two studies are in progress: 1) the first in human (FIH), randomized, double-blind, placebo-controlled, parallel group phase 1 study for HVs ages 18-55 years; and 2) a single arm, intrapatient single dose and multiple ascending dose study in homozygous HbSS SCD patients ages 18-60 years with baseline Hb levels ≥5.5 g/dL and ≤10.5 g/dL and without vaso-occlusive crisis or transfusion within 30 days of screening. The HV study tests single ascending doses (SAD) with a 6:2 randomization ratio. Doses administered to HV cohorts ranged from 50 mg to 2200 mg. The SCD patient study tests a single dose (100 mg) followed by multiple ascending doses of the study drug in the same patients to reach a % Hb occupancy of >20-30% over 7 weeks. The primary endpoints for both studies are safety and tolerability. Secondary endpoints include PK and PD. For the patient study, additional secondary endpoints are confirmation of the relationship between time matched GBT021601 concentrations and the change from baseline of clinical measures of anemia and hemolysis. Hb occupancy is calculated as a percentage of the molar ratio of drug concentrations in RBCs to the estimated Hb concentrations (using MCHC) in RBCs. Results: As of July 22, 2021, 63 HVs and 6 adults with SCD were enrolled. Thirty-nine HVs completed the study; one discontinued due to moving to a new geographical area and 23 were in follow-up. GBT021601 was generally well-tolerated, most adverse events (AE) were Grade 1 and 2, there were no deaths, and there was one serious adverse event in a HV that was not related to the study drug. There were no AEs indicative of tissue hypoxia. GBT021601 showed linear PK, high partitioning into RBCs, and a dose dependent increase in percent hemoglobin occupancy in HVs (Figure 1). From single doses of 50 to 1400 mg, the mean preliminary % Hb occupancy ranged from 0.88 to 25%, respectively, exceeding the Hb occupancies reported for HV receiving single doses of voxelotor over a similar range (Putz, 2017). Six adults with SCD have received a single 100 mg dose of GBT021601 and the dose has been well tolerated. Multiple-dose data in adults will be presented. Conclusions: Single doses of GBT021601 are well tolerated in HV and adults with SCD. Given its drug exposure, GBT021601 has the capacity to achieve a targeted Hb occupancy and attain the desired hematological effect at low doses, therefore reducing pill burden and improving clinical outcomes for individuals living with SCD. Forthcoming multiple-dose data will help to evaluate GBT021601's potential as a best-in-class, oral, disease-modifying therapy for SCD. Funding: This study was supported by Global Blood Therapeutics. Figure 1 Figure 1. Disclosures Brown: Pfizer: Research Funding; Imara: Consultancy, Research Funding; Novartis: Consultancy, Research Funding; Forma Therapeutics: Research Funding; Novo Nordisk: Consultancy; Global Blood Therapeutics: Consultancy, Research Funding. Redfern: Eisai: Other: Advisory Board; Linear Clinical Research: Current Employment; Pfizer: Other: Advisory Board; Novartis: Other: Advisory Board; Astra Zeneca: Other: Advisory Board; Roche: Other: Advisory Board. Lisbon: Global Blood Therapeutics: Current Employment. Washington: Global Blood Therapeutics: Consultancy. Agodoa: Global Blood Therapeutics: Current Employment, Current equity holder in publicly-traded company. Smith-Whitley: Global Blood Therapeutics: Current Employment.

Introduction: Pregnancies of women with sickle cell disease (SCD) have increased risk of morbidity and mortality, with potential additional complications due to uncertain teratogenicity of hydroxyurea and the newer medications. Unintended pregnancy is common among adolescents and young adults (AYA). We aimed to assess the beliefs, practices and barriers of U.S. pediatric hematology providers related to contraception for female AYA with SCD, as little is known about this topic. Methods: We developed a 25-question, web-based survey guided by the Health Belief Model to assess pediatric SCD providers' contraceptive perspectives and practices. Most questions were adapted from published surveys assessing provider views and practices on contraception for general AYA care or patients with other chronic health conditions. The survey was distributed from December 2020-April 2021 to licensed U.S. prescribers who provided care to female SCD AYAs ages 12-21 years within the prior two years. The anonymous survey was distributed by two methods: (1) a list of 526 pediatric SCD and/or general hematology providers from the HRSA SCD Treatment Demonstration Program Regional Collaborative, cross-referenced for reminder emails to 126 providers using a list from the HRSA Regional Genetics Collaborative (https://www.hrsa.gov); (2) directors from all 74 U.S. ACGME-accredited Pediatric Hematology-Oncology fellowship programs, asking then to forward the survey to their SCD providers. Surveys with >50% completion were analyzed using descriptive statistics and chi square analyses. Results: Of 177 respondents, 160 surveys met inclusion criteria and were analyzed: 73 (45.6%) contacted by emails and 87 (54.4%) contacted via the fellowship directors (Table 1). Respondents recruited via fellowship program directors were more frequently NP/PAs (total of 30 (18.7%)), of younger age (total 103 (64.4%) and had fewer years in practice compared to those contacted directly. The majority of providers reported counseling (76.9%) and/or referring patients for contraception (90.9%), but not prescribing (41.8%). Practices regarding contraception differed by provider characteristics (Table 2). Trainees vs. established providers less frequently reported counseling about contraception (54.1% vs. 84.6%, p30% respondents) were insufficiencies in time, patient/parent willingness, formal training, knowledge/ability and/or professional guidelines. Concerns about side effects was a barrier to prescribing (34.2%), while lack of access to providers with contraceptive expertise was the most common barrier to patient referral (34.9%). Multivariate analyses are ongoing. Conclusions: To our knowledge, this is the first national report of pediatric hematology providers' beliefs and practices regarding contraception for female AYA with SCD. While providers generally felt responsible for offering counseling and referral but not prescribing, practices varied based on certain provider characteristics, beliefs and perceived barriers. Clinical guidelines, improved provider education and training, and patient/parent decision Figure 1 Figure 1. Disclosures Smith-Whitley: Global Blood Therapeutics: Current Employment. Strouse: Takeda: Consultancy.

In utero hematopoietic cell transplantation (IUHCT) has curative potential for sickle cell disease (SCD) but carries a risk of fetal demise.We assessed the conditions under which parents of children with SCD and young adults with SCD would consider IUHCT in a future pregnancy, given a 5% fixed risk of fetal demise. Participants were randomized to consider a hypothetical cure rate (20%, 40%, or 70%). Subsequently, cure rate was either increased or decreased depending on the previous answer to reveal the lowest acceptable rate. Participants also completed the Pediatric Research Participation Questionnaire (PRPQ) and an omission scale.Overall, 74 of 79 (94%) participants were willing to consider IUHCT, and 52 (66%) participants accepted IUHCT at a cure rate of 40%, the estimated rate of therapeutic mixed chimerism. Participants with higher scores on the PRPQ perceived benefits scale were more likely to participate at lower cure rates (OR 1.08, p=0.007) and participants with a greater degree of omission bias were less likely to participate at lower cure rates (OR 0.83, p=0.04). Demographics and SCD severity were not significantly associated with acceptability of IUHCT.This study suggests that the majority of parentsand young adults would consider IUHCT under expected therapeutic conditions.

Background: Sickle cell disease (SCD) is a genetic disorder that causes significant medical and neurologic morbidity in children. Hydroxyurea (HU) is the primary medication used to prevent these complications. National Heart, Lung, and Blood Institute (NHLBI) guidelines recommend offering HU to children as young as 9 months of age with SCD (HbSS or HbSB0 thalassemia) using a shared decision-making approach. Although HU has proven efficacious it remains underutilized and caregivers report that they are not always actively involved in the decision to initiate this therapy. Reasons for limited HU uptake likely include lack of clinician knowledge and training and negative caregiver perceptions. Thus, we developed the Engage-HU trial as a novel approach to address HU utilization barriers. A critical consideration for this trial was that SCD primarily affects individuals of African and Hispanic/Latino descent. In these minority populations, intervention trials are sometimes terminated early because of recruitment difficulties related to mistrust of research, caregiver burden, and transportation issues. As such, the Engage-HU trial design included best-practice strategies for recruiting people of color in research. This study describes these strategies, the initial recruitment plan, preliminary recruitment outcomes and strategies, and our procedural adaptations. Study Design and Methods: Engage-HU is a randomized control trial (NCT03442114) to assess how clinicians can engage caregivers in a shared discussion that considers their values and preferences and includes evidence that supports HU. Engage-HU compares two dissemination methods for clinicians to facilitate shared decision-making with caregivers of young children with SCD: 1) the American Society of Hematology Pocket Guide, and 2) the HU Shared-Decision Making (H-SDM) Toolkit. The study aims to recruit 174 caregivers and evaluate the effectiveness of the dissemination methods on patient-centered outcomes (caregiver confidence in decision-making and perceptions of experiencing shared decision-making) as well as HU uptake and child health outcomes. Eligible children are aged 0 to 5 years, candidates for HU, and their caregiver has not made a decision about HU in the past 3 months. The trial is being conducted at 9 sites in the United States and uses a stepped-wedge design. Data will be analyzed based on the intent-to-treat principle. All participants will remain in the arm of the study to which they were randomized, regardless of whether or not they receive the assigned dissemination method. The primary endpoints are caregiver decisional uncertainty and caregiver perception of shared decision-making measured using validated tools. Data will be analyzed using a linear mixed effects regression model with a robust variance estimator and maximum likelihood estimation with observations clustered within site. The Engage-HU trial includes adaptations to increase recruitment such as tailored messaging, a relational recruitment approach, streamlined data collection, and a Stakeholder Advisory Committee. However, even with these adaptations, the first 6-months of the trial yielded lower than anticipated recruitment. Rather than terminate the trial or accept low enrollment, the research team implemented a series of recruitment strategies to address barriers including helping to improve research coordinator knowledge of the study purpose and adjusting no-show and follow-up procedures (e.g., calls to families after missed appointments and reminder calls before appointments). Site clinicians and clinic staff were provided with additional training so they could give more context about Engage-HU to caregivers and the study principal investigator led monthly "all coordinator" calls to provide support by sharing updates and experiences about successful recruitment. Implementation of these strategies resulted in triple the number of enrollments over the next 7-months compared to the previous 6-months (Table 1). Our goal in sharing this information is to provide lessons learned that can be implemented in future trials with the systematically underserved SCD population. It is also anticipated that methods described here may also inform clinical approaches to better engage caregivers of young children around critical clinical conversations, such as initiating medications like HU. Disclosures King: Magenta Therapeutics: Membership on an entity's Board of Directors or advisory committees; Bioline: Consultancy; RiverVest: Consultancy; Novimmune: Research Funding; Celgene: Consultancy; Tioma Therapuetics: Consultancy; Amphivena Therapeutics: Research Funding; WUGEN: Current equity holder in private company; Cell Works: Consultancy; Incyte: Consultancy. Smith-Whitley:Prime: Other: Education material; Celgene: Membership on an entity's Board of Directors or advisory committees; Global Blood Therapeutics: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees. Neumayr:Emmaus: Consultancy; Bayer: Consultancy; CTD Holdings: Consultancy; Pfizer: Consultancy; ApoPharma: Consultancy, Membership on an entity's Board of Directors or advisory committees; Micelle: Other: Site principal investigator; GBT: Other: Site principal investigator; PCORI: Other: site principal investigator; Novartis: Other: co-investigator; Bluebird Bio: Other: co-investigator; Sangamo Therapeutics: Other; Silarus: Other; Celgene: Other; La Jolla Pharmaceuticals: Other; Forma: Other; Imara: Other; National Heart, Lung, and Blood Institute: Other; Health Resources and Services Administration: Other; Centers for Disease Control and Prevention: Other; Seattle Children's Research: Other. Yates:Novartis: Research Funding. Thompson:Novartis: Consultancy, Honoraria, Research Funding; CRISPR/Vertex: Research Funding; BMS: Consultancy, Research Funding; Baxalta: Research Funding; Biomarin: Research Funding; bluebird bio, Inc.: Consultancy, Research Funding.

Pregnancy in women with sickle cell disease (SCD) is associated with increased maternal and fetal morbidity and mortality. Outcomes vary widely owing to methodological limitations of clinical studies, but overall, hypertensive disorders of pregnancy, venothromboembolism, poor fetal growth, and maternal and perinatal mortality are increased globally. Few therapeutic interventions have been explored other than prophylactic and selective transfusion therapy. Unfortunately, existing data are limited, and it remains unclear whether prophylactic use of chronic transfusions will improve pregnancy outcomes. Management of pregnant women with SCD is best accomplished with a multidisciplinary team that includes a sickle cell expert and an obstetrician familiar with high-risk pregnancies. Women with SCD should have individualized care plans that outline management of acute pain and guidelines for transfusion therapy. Neonates require close monitoring for neonatal abstinence syndrome and hemolytic disease of the newborn. Ideally all young women with SCD will have a "reproductive life plan" developed as a component of preconception counseling and health promotion. Research leading to improved pregnancy management focused on diminishing adverse maternal and neonatal outcomes is overdue. International collaborations should be considered to improve subject recruitment and foster timely completion of clinical trials. Additional therapeutic interventions outside of transfusion therapy should be explored.

Background Hydroxyurea (HU) is recommended as standard practice for youth with sickle cell disease (SCD). Yet, despite its efficacy, HU adherence in adolescents and young adults is often poor. Poor medication adherence increases disease burden, healthcare cost and widens health disparities. Adolescence is a critical time to improve adherence through improved chronic disease self-management. This study aims to test the efficacy of an intervention delivered to youth/parent dyads by community health workers (CHWs), augmented by tailored text messages on HU adherence (primary outcome). Secondary outcomes are intervention sustainability, youth health-related quality of life, self-management responsibility concordance, acute hospital use and self-reported disease symptoms. Methods Hydroxyurea Adherence for Personal Best in Sickle Cell Disease, “HABIT,” is a 12 month multi-center randomized controlled trial. One hundred four youth, 10 to 18 years of age prescribed HU who meet eligibility criteria, enrolled with their parent as dyads, will be randomized 1:1 to either the HABIT intervention or to usual clinical care plus education handouts. All subjects will complete clinic visits at months 0, 2, 4, 6 (efficacy component), 9 and 12 (sustainability component) for assessment of HbF biomarker, other hematologic parameters, and to complete questionnaires. In addition, dyads assigned to the HABIT intervention will work with CHWs to identify a daily habit (e.g., brushing teeth) on which to build a HU adherence habit. Tailored daily text message reminders to support the habit will be developed by the dyad in collaboration with the CHWs and sent to parent and youth. At the 6 month visit, the intervention will end and the sustainability portion of the trial will begin. All data analyses will be based on intention to treat with all randomized subjects included in the analyses. Discussion Prior retrospective studies demonstrate that a majority of adolescents are poorly adherent to HU. If efficacious, the HABIT intervention has the potential to improve the lives of youth with SCD. Trial registration Clinicaltrials.gov NCT03462511. Registered March 6, 2018, last updated July 26, 2019.

Sickle cell disease (SCD) is an inherited blood disorder most common among African American and Hispanic American persons. The disease can cause substantial, long-term, and costly health problems, including infections, stroke, and kidney failure, many of which can reduce life expectancy. Disparities in receiving health care among African Americans and other racial/ethnic minority groups in the United States are well known and directly related to poor outcomes associated with SCD. As an orphan disease—one that affects

Background Sickle cell disease (SCD) is an autosomal recessive hemoglobinopathy associated with morbidity and mortality. We sought to understand family planning intentions of parents of young children with SCD including the awareness of three reproductive options (adoption, in vitro fertilization with egg/sperm donation [IVFD], in vitro fertilization [IVF] with preimplantation genetic testing [IVF/PGT]) to decrease the risk of having a child with SCD. Procedure Qualitative, semistructured, one-on-one interviews with 18 female parents of young children with SCD at an urban, tertiary care pediatric hospital. Results Half of the parents knew their hemoglobinopathy status or their partner's status before pregnancy. Eight parents chose to have no further children because of fear of SCD in another child. Awareness of reproductive options prior to study enrollment was limited. After brief introduction, 7 parents would consider adoption, 2 IVFD, and 10 IVF/PGT. Desire for a biological child, fear of parental jealousy, ethical or religious considerations, and cost affected the acceptability of these options. Participants universally wanted information about reproductive options available to others prior to pregnancy. Conclusions There is limited awareness and variable acceptability of alternative reproductive options available to decrease the risk of a future child having SCD. Participants universally endorsed the need for education regarding hemoglobinopathy status, SCD, and reproductive options prior to pregnancy because for many participants having a child with SCD affected their reproductive intentions. Educational interventions to ensure informed reproductive decision making should be sensitive to desires for a biological child, and ethical and financial considerations.