Should we adopt an automated de-centralized model of chimeric antigen receptor- T cells manufacturing for low-and middle-income countries? A real world perspective

Safety, efficacy and total cost of point-of-care manufactured anti-CD19 CAR-T cell therapy in India: VELCART trial

Decentralized or point-of-care (POC) manufacture of CAR-T cells is a potential strategy to improve accessibility and reduce cost and logistic challenges. A total of 10 relapsed/refractory patients (B cell acute lymphoblastic leukemia [B-ALL] N = 6, diffuse large B cell lymphoma [DLBCL] N = 4) were enrolled in this POC phase 1 study. Chimeric antigen receptor (CAR)-T cells were manufactured using the fully automated CliniMACS Prodigy system. The CAR-T cell products had a median 15-fold expansion with a median transduction rate of 38%. The immunophenotypic characterization indicates a significant increase in central memory and effector T cells. All the patients were infused with fresh CAR-T cells. Complete remission rates were 100% for B-ALL and 50% for DLBCL. At a median follow-up of 15 months, 8 of 10 patients remain without disease progression. Adverse events reported were cytokine release syndrome grade 2 or higher in 2 of 10 patients. None of the patients developed immune effector cell-associated neurotoxicity syndrome. Late hematological toxicity of grade 2 or higher was noted only in one patient. Evaluation of health care resource utilization demonstrates that the median cost was US$12,724, while the manufacturing cost was US$35,107. Our data highlight the safety, efficacy, low cost, and potential to enhance the accessibility of CAR-T cell therapy in low- and middle-income countries through a fully automated and closed manufacturing platform.

Costs, challenges and opportunities of decentralised chimeric antigen receptor T-cell production: a literature review and clinical experts' interviews

The objectives were to summarise the evidence and clinical experts' views comparing the use of decentralised produced chimeric antigen receptor (CAR) T-cell therapies versus commercially available products, regarding drug costs, time to finalised product and other reported advantages, disadvantages, challenges and facilitators. A literature review according to the PRISMA guidelines was conducted in Medline, Embase and Trip databases. Publications were included if they reported information on cost estimates, time to finalised products and other outcomes of interest of a decentralised CAR T-cell production strategy. A structured interview guide was developed and used for qualitative expert interviews. Five experts were purposively selected, and interviews were either conducted face-to-face or online, and recorded for the purpose of transcription. Transcripts were analysed and categories and codes extracted. Reporting is based on the COREQ checklist for reporting qualitative research. Costs of decentralised produced CAR T-cells appear to be lower by a factor two to 14, compared with commercial products. But there is high uncertainty about this estimate, because it is unclear whether cost components included are comparable and due to the heterogeneity of the studies. The most commonly reported advantages were proximity to patients and decreased product risks and costs, whereas the continuing dependency on centrally manufactured reagents and specific characteristics of 'fresh' CAR T-cells are reported as disadvantages. Compliance with regulatory requirements is mentioned as the biggest challenge. The availability of closed-system production devices is reported as one main facilitator, as are clear commitment, secured financing and knowledge transfer from already experienced centres. Apparent cost differences open a field for healthcare decision-makers to discuss and justify investment costs for implementation of a complementing decentralised production programme and to realise other associated benefits of such a strategy, such as flexibility, patient proximity and expanding patient access.

Survey-based assessment of hematopoietic stem cell graft manipulation (minimal) by cell therapy labs supporting hematopoietic stem cell transplants in India

BACKGROUND AIMS

Hematopoietic stem cell transplants (HSCTs) are increasingly being offered to patients in India for various conditions. The Indian Stem Cell Transplant Registry shows that a total of 2533 transplants were done in India in 2019.

METHODS

An epidemiological descriptive cross-sectional survey (55 questions) of centers providing HSCT in India was planned to analyze variations in policies and practices regarding HSCT graft manipulation (i.e., plasma reduction, red blood cell [RBC] depletion and cryopreservation). A total of 63 of 102 centers responded to the survey (response rate, 61.7%), mostly from the northern part of India (27 of 63 [42.8%]).

RESULTS

The majority of responding centers reported performing >50 HSCTs annually (n = 24 [38%]), and 92% (58 of 63) performed stem cell collections from a pediatric donor/patient (age <18 years). A total of 56 of 63 responding centers indicated that they did product manipulations involving cryopreservation (n = 45), plasma reduction (n = 42) and RBC depletion (n = 28). Cryopreservation was primarily done by blood centers (27 of 45 [60%]), with dimethyl sulfoxide (DMSO) being the primary constituent, used most commonly at a concentration of 5-10% (28 of 45 centers). Dump freezing was most commonly used (27 of 45) with a -80°C deep freezer. A 7-aminoactinomycin D based viability assessment was also most commonly used (30 of 45). Thawing of the product was done mainly at the bedside (30 of 45) using a wet-type thawer (36 of 45), and washing of DMSO was done by a few centers (seven of 45). Plasma reduction and RBC depletion were primarily done for ABO incompatibility at blood centers.

CONCLUSIONS

This survey demonstrates the lack of standardization and uniformity in the minimal manipulation of hematopoietic stem cell grafts in centers supporting HSCT in India. This work also highlights the need for more studies and country-specific recommendations to establish best practices.

Promises and challenges of a decentralized CAR T-cell manufacturing model

Autologous chimeric antigen receptor-modified T-cell (CAR T) products have demonstrated un-precedent efficacy in treating many relapsed/refractory B-cell and plasma cell malignancies, leading to multiple commercial products now in routine clinical use. These positive responses to CAR T therapy have spurred biotech and big pharma companies to evaluate innovative production methods to increase patient access while maintaining adequate quality control and profitability. Autologous cellular therapies are, by definition, manufactured as single patient batches, and demand has soared for manufacturing facilities compliant with current Good Manufacturing Practice (cGMP) regulations. The use of a centralized production model is straining finite resources even in developed countries in North America and the European Union, and patient access is not feasible for most of the developing world. The idea of having a more uniform availability of these cell therapy products promoted the concept of point-of-care (POC) manufacturing or decentralized in-house production. While this strategy can potentially decrease the cost of manufacturing, the challenge comes in maintaining the same quality as currently available centrally manufactured products due to the lack of standardized manufacturing techniques amongst institutions. However, academic medical institutions and biotech companies alike have forged ahead innovating and adopting new technologies to launch clinical trials of CAR T products produced exclusively in-house. Here we discuss POC production of CAR T products.