Multi-Disciplinary Care Model for Transition and Re-Transition after Gene Therapy in Sickle Cell Disease

Background: Hematopoietic stem cell transplant (HSCT) based gene therapies (GT) have successfully demonstrated significant reduction in vasocclusive crises (VOCs) associated with sickle cell disease (SCD). The efficacy and safety of these products is well established across multiple clinical trials (Kanter et al. NEJM 2022, Frangoul et al. NEJM 2024). This led to the Food and Drug Administration (FDA) approval of the lentiviral-based gene addition product (lovotibeglogene autotemcel) and CRISPR-Cas9 based gene editing product (exagamglogene autotemcel) for patients with SCD above 12 years of age. As these therapies have a different logistical process compared to a standard allogeneic HSCT, there is a need to develop a collaborative transition of care plan for these patients and families prior to and long after completion of transformative therapies.

Methods: Upper Midwest Sickle Cell Curative Therapies Consortium is a collaborative model including multiple stakeholders between 7 centers across the upper Midwest United States, the regional community-based organization (CBO) and National Marrow Donors Program (NMDP). The structure and workflow for this model was presented previously (Blaylark et al. ASH 2023). With the advent of commercial GTs, we developed a multi-specialty care model in collaboration with community stakeholders to address diverse patient and logistical needs for smoother transition to and from these therapies.

Discussion: The initial transition is a period of potential gaps in medical care and often high anxiety for patients and families. Thus, when patients and families are considering GT, our care model engages a multidisciplinary team. As part of the comprehensive evaluation prior to gene therapy, an initial shared collaborative checklist includes an extensive medical history, assessment of treatment plan, an individualized pain plan and adherence, transfusion planning (simple or exchange) with setting of target hemoglobin and hemoglobin S% targets, and coordination of multi-specialty consults including apheresis, fertility preservation, child life, and social work. Additionally, pain, psychology, and integrative medicine specialists address not only ongoing concerns, but also help develop a plan for future transition back to the primary site of SCD care (“re-transition”) after GT. Patients undergo neuropsychological evaluations to establish baseline functioning and the role of chronic pain and fatigue, as GT can significantly impact long term cognitive functioning, emotional coping with transitions, and overall daily functioning. When appropriate and available, warm handoffs are encouraged between centers within each of these specialties. Our team also reviews available resources for education and ongoing support through the process and after from national and regional CBOs. Similarly, the post-GT transition is also a period of potential medical care gaps and high anticipated anxiety and concern, as patients go through significant unfamiliar adverse effects followed by the potential for persistent freedom from VOCs. In the post-GT transition, ongoing psychology, integrative medicine, and pain team support; peer mentoring; and support groups are critical for a smooth re-transition to post-GT care and further successful re-transition back into the community. Using this interdisciplinary approach across GT clinical trials, we successfully weaned opioids in 83% of patients (5/6) by day 60 post-GT infusion and successful re-transition of these patients, further highlighting the role of interdisciplinary care. Our team's collaborative approach to SCD care with sickle cell specialists, transplant team and other care providers and CBO continues into the long term follow up period, including ongoing supportive services for both patients and their families.

Conclusion: As newer therapies are developed and approved for transformative SCD care, development of a transitional model with early engagement of an interdisciplinary team is critical for empowering sickle cell warriors and for their successful transition back into the community.

Kao:Editas Medicine: Research Funding; Optum: Honoraria. Blaylark:Bluebird Bio: Membership on an entity's Board of Directors or advisory committees; Agios: Membership on an entity's Board of Directors or advisory committees. Boucher:CSL Behring: Research Funding; Takeda Pharmaceuticals: Research Funding. Gupta:Beam Therapeutics: Research Funding; Emerging Therapies Solutions: Speakers Bureau; Jazz Pharmaceuticals: Research Funding; Vertex Pharmaceuticals: Consultancy, Membership on an entity's Board of Directors or advisory committees; bluebird bio, Inc.: Research Funding; Orchard Therapeutics: Research Funding. Fritch Lilla:Chiesi: Speakers Bureau; Agios: Honoraria; Sobi: Honoraria; Octapharma: Consultancy.