[Report: tisagenlecleucel for the treatment of relapsed or refractory B-cell acute lymphoblastic leukemia]

Bisaillon R, Mombo NN, Beha S, Brouard ME, Arbour S, Béland M
Record ID 32018000985
French
Original Title: Avis: tisagenlecleucel pour le traitement de la leucémie lymphoblastique aiguë récidivante ou réfractaire
Authors' objectives: For the first formal requests to Institut national d’excellence en santé et en services sociaux (INESSS) to evaluate cell therapies, such as those of the CAR-T type, it was agreed with the Ministère de la Santé et des Services sociaux (MSSS) that a consultative arrangement with the different ministerial teams concerned would be put in place to rule both on the advisability of the evaluation and the relevance of widening its scope, specifically, by giving special attention to the organizational issues relating to implementation. Since this approach was more in line with a conventional health technology assessment, INESSS gave the Direction des services de santé et de l’évaluation des technologies (DSSET) the task of evaluating this therapy using a tailored process that meets the same levels of quality and rigour that are characteristic of INESSS’ work and that encourages the combining of different types of knowledge and perspectives, including those provided by clinicians, patients and the general public.
Authors' results and conclusions: RESULTS: (EFFICACY) The tumour response to treatment as measured by the overall response rate (JULIET: 52%; A2101J: 50%, based on a per-protocol analysis), is considered substantial in patients with an advanced stage of the disease. The response rate appeared to be lower in the intent-to-treat analysis (JULIET: 34%; A2101J: figure not reported). Nonetheless, the response was rapid (occurring as early as 3 months after treatment) and long-lasting (median not achieved; median follow-up 13.9 months in JULIET and 28.6 months in A2101J). The results of study A2101J showed that the response to treatment can be long-lasting (median: 22.2 months) without subsequent treatments. The overall survival data are, however, immature, with rates estimated at 62% at 6 months and 49% at 1 year in the JULIET study, and the extent of the response to treatment is difficult to determine because there is no direct comparison. In the JULIET study, close to one-half of the patients who received tisagenlecleucel died, most following disease progression. It should be noted that this treatment could not be administered to 30% of the patients enrolled in the JULIET study, mainly because of disease progression, death due to DLBCL or production failures. The data on tisagenlecleucel are from uncontrolled trials with a weak level of evidence. However, the experts consider their designs acceptable, given the absence of a standard, effective third-line treatment. (SAFETY) In the JULIET study, all the patients who were treated with tisagenlecleucel experienced adverse events, most of which were grade 3 or higher. Cytokine release syndrome is a potentially serious adverse event frequently associated with CAR-T therapy. The proportion of patients who experienced this syndrome (approximately 20%) was similar in the JULIET and A2101J studies. The severe form of this syndrome requires admission to an intensive care unit and the administration of tocilizumab, which has yet to be approved by Health Canada for this indication. The patients (11.7%) who experienced severe neurological events (grade 3 and higher) were also closely monitored in the intensive care unit. Another potential complication is prolonged B-cell aplasia, which can lead to infections and requires symptomatic management with monthly immunoglobulin injections. No deaths related to tisagenlecleucel therapy have been reported in the studies. (QUALITY OF LIFE) The data from the JULIET study indicate that an improvement in quality of life is achieved 3 months after tisagenlecleucel is administered. However, the significance of these results is limited by the small number of patients questioned and the short duration of follow-up. (THERAPEUTIC VALUE) The naïve indirect comparison of the JULIET and A2101J studies with the two extension studies of the CORAL trial and the SCHOLAR-1 study seems to show higher overall response rates and a more durable response with tisagenlecleucel than with the third-line chemotherapies. However, this comparison has several limitations, which affects the significance of the conclusions. The risk-benefit ratio for tisagenlecleucel nonetheless seems favourable in the short term. It will need to be reassessed in light of new, more robust data. (ECONOMIC DATA) Given the absence of comparative clinical data with salvage chemotherapies, the results of the pharmacoeconomic analysis are highly uncertain. Nevertheless, the pharmacoeconomic model, which INESSS considers acceptable, was used to construct exploratory scenarios, including probabilistic analyses. Therefore, if the promise of the therapy’s long-term value is confirmed, the incremental cost-utility ratio would be close to $180,000/QALY gained. When all the sources of uncertainty identified by INESSS are taken into account, the results of the probabilistic analysis show that there is a 7% probability that the ratio would be less than $200,000/QALY gained. For the record, the probability would be 92% for a ratio of less than $300,000/QALY gained. If, however, the promise of value is not confirmed, the incremental cost-utility ratio could be more than $3 million/QALY gained. Tisagenlecleucel is a costly technology intended for a population estimated at more than 60 patients a year. The total additional costs to the public health and social services system would be $88.7 million for the first 3 years after tisagenlecleucel is listed. When all the sources of uncertainty identified by INESSS are taken into consideration, the results of the probabilistic analysis show that there is an 80% probability that the costs would range from $76 million to $101 million. (DATA OBTAINED FROM PATIENTS, PATIENT ASSOCIATIONS AND MEMBERS OF THE GENERAL PUBLIC) The patients who had received CAR-T-type therapy reported having chosen this option because they had exhausted all the other available treatment options. Some of the patients consulted indicated that being in remission outweighed the adverse effects that they experienced. The representatives of patient associations consulted said, in fact, that, given the last-resort context, the uncertainties associated with the long-term efficacy and safety of this therapy should not be a major concern. For their part, the patients consulted who did not try this therapy and their families indicated that they would be willing to try it and to put up with the potential adverse effects, even if the benefits were short-lived and the disease relapsed or became refractory. The members of the general public consulted said that they were concerned about many aspects of the therapy, mainly because of the limited data on it, despite the fact that the results are promising. They added that they were also concerned about the production process taking place outside the country (the cross-border transport of the cells, the loss of control over the process, and the ownership of the cells). They also expressed their opinion about the potential impact of the therapy on the healthcare system and on society, be it the potential hospital overcrowding, the economic consequences or access to the therapy. Some of them even raised the issue of public expenditures associated with CAR-T therapy, which could be used to fund the manufacturer’s clinical studies for an investigational treatment. Nonetheless, the members of the general public stressed the importance of maintaining Quebec hospitals’ expertise and competitiveness in the area of cell therapy. (ETHICAL CONSIEDERATIONS) Different ethical and social issues surrounding tisagenlecleucel were identified, including the current situation in which the manufacturer has a monopoly, the potential serious long-term adverse effects, and the constraints in patients’ access to the therapy. Given the last-resort context and the high degree of vulnerability of patients and their families, special attention should be given to free and informed decision-making.
Authors' recomendations: Despite the uncertainty regarding tisagenlecleucel’s therapeutic value, and given the great promise it holds in the treatment of patients with r/r DLBCL, INESSS considers that covering it could be a fair and reasonable option to the extent that the following goals are met: a considerable mitigation of the economic burden, the introduction of a temporary status for such coverage until more robust data are available (3-year time horizon). the continued development of evidence concerning tisagenlecleucel’s therapeutic value and safety. (INDICATION RECOGNIZED FOR COVERAGE) The indication for coverage proposed for tisagenlecleucel (Kymriah) is as follows: for the treatment of adult patients with relapsed or refractory large B-cell lymphoma after two or more lines of systemic therapy including diffuse large B-cell lymphoma (DLBCL) not otherwise specified, high grade B-cell lymphoma and DLBCL arising from follicular lymphoma. In addition, patients must meet all of the following criteria: disease positive for the CD19 marker; ECOG performance status 0 or 1; life expectancy of at least 12 weeks; no previous anti-CD19 therapy. (IMPLEMENTATION CONSIDERATIONS) 3. The impact of introducing tisagenlecleucel on hospital management, specifically, in intensive care units, is a major concern. Any offer of service should be carefully planned to ensure that the necessary resources are acquired so as not to compromise access to routine care and services at the hospitals concerned. 4.Sustained data-gathering by the manufacturer in real-world healthcare settings could help optimize the implementation and management of the use of this therapy by providing additional information applicable to the Quebec context. At a minimum, the collected data should include: the time to the administration of the therapy; the duration of the clinical response; the 1- and 3-year overall survival rates; the number and types of subsequent treatments (e.g., chemotherapy and transplantation); the incidence of serious complications.
Authors' methods: The literature data and the data provided by the manufacturer were reviewed to document the efficacy, safety and efficiency of tisagenlecleucel. Data on the patient and general public perspectives were gathered by means of two consultative panels. The data from Lymphoma Canada surveys were studied as well. The ethical aspects were examined by way of a narrative review. In addition, a cost-utility analysis and a budget impact analysis are presented, as are contextual data from the consultations with health professionals in the field.
Details
Project Status: Completed
Year Published: 2019
English language abstract: An English language summary is available
Publication Type: Full HTA
Country: Canada
Province: Quebec
MeSH Terms
  • Precursor Cell Lymphoblastic Leukemia-Lymphoma
  • Leukemia, Lymphoid
  • Immunotherapy, Adoptive
  • Receptors, Antigen, T-Cell
  • Antineoplastic Agents
  • Antineoplastic Agents, Immunological
Keywords
  • Acute lymphoblastic leukemia
  • Lymphatic leukaemia
Contact
Organisation Name: Institut national d'excellence en sante et en services sociaux
Contact Address: L'Institut national d'excellence en sante et en services sociaux (INESSS) , 2021, avenue Union, bureau 10.083, Montreal, Quebec, Canada, H3A 2S9;Tel: 1+514-873-2563, Fax: 1+514-873-1369
Contact Name: demande@inesss.qc.ca
Contact Email: demande@inesss.qc.ca
Copyright: Gouvernement du Québec
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