Fate Therapeutics Announces Clinical Safety and Activity Data of First-ever iPSC-derived CAR T-cell Therapy at 2022 ASH Annual Meeting
FT819 Off-the-Shelf CAR T-cell Product Candidate Derived from Clonal Engineered Master iPSC Line with Novel CD19-specific 1XX CAR Integrated into TRAC Locus
Interim Phase 1 Dose-escalation Data Indicate Favorable Safety Profile with Complete Responses in Heavily Pre-treated Patients with Aggressive Large B-cell Lymphoma
“We are very excited about the early safety and efficacy data emerging from our groundbreaking clinical study of the first-ever iPSC-derived T-cell therapy. Data from the initial dose-escalation cohorts of a single dose of FT819 are indicative of a favorable safety profile and clearly demonstrate activity in heavily pre-treated patients with aggressive large B-cell lymphoma, including in patients that were not eligible for or had previously failed autologous CD19-targeted CAR T-cell therapy,” said
Interim Phase 1 Dose-escalation Efficacy Data
The multi-center Phase 1 clinical trial of FT819 is designed to assess its safety and clinical activity in adult patients with r/r BCL and to determine the recommended Phase 2 dose and schedule. As of the
In Regimen A, of the 8 patients with aggressive large B-cell lymphoma (median of 4.5 prior lines of therapy [range 3-7]) treated with a single dose of FT819 ranging from 90 million cells to 360 million cells (see Table 1):
- 1 of 2 patients naïve to CAR T-cell therapy achieved an objective response (1 CR) at Day 30, which was a complete response in a patient with diffuse large B-cell lymphoma (DLBCL) previously treated with 5 prior lines of therapy; and
- 2 of 6 patients previously treated with CAR T-cell therapy achieved an objective response (1 CR, 1 PR) at Day 30, which included a complete response in a patient with DLBCL previously treated with 7 prior lines of therapy who did not respond to autologous CD19-targeted CAR T-cell therapy.
In Regimen B, 2 patients with aggressive large B-cell lymphoma (each of whom received 3 prior lines of therapy) treated with three fractionated doses at 30 million cells per dose did not respond to therapy at Day 30.
|Table 1: Aggressive Large B-cell Lymphoma 1,2,3|
|FT819 Regimen A: Single Dose (n=8)|
|CAR T-cell Therapy Naïve||Prior CAR T-cell Therapy|
|OR / CR||0 / 0||n/a||1 / 1||2 / 1||0 / 0||0 / 0|
|FT819 Regimen B: Three Fractionated Doses (n=2)|
|CAR T-cell Therapy Naïve||Prior CAR T-cell Therapy|
|Cells / Dose||30M||30M|
|OR / CR||0 / 0||0 / 0|
|OR = objective response; CR = complete response; M = million
1 As of data cutoff date of
2 Includes diffuse large B-cell lymphoma (n=8) and high-grade B-cell lymphoma (n=2)
3 Day 30 protocol-defined response assessment per Lugano 2014 criteria
As of the
Interim Phase 1 Dose-escalation Safety Data
No dose-limiting toxicities, and no Grade 3 or greater FT819-related adverse events (AEs) or serious AEs, were observed. Of the 15 patients treated in Regimens A and B, three patients (20%) experienced Grade 2 cytokine release syndrome (CRS) characterized by fever, hypotension, and hypoxia, which events resolved with single-dose tocilizumab and supportive care. No treatment-emergent AEs (TEAEs) of any grade of immune effector cell-associated neurotoxicity syndrome (ICANS) or graft-versus-host disease (GvHD) were reported by investigators. The FT819 treatment regimen was well tolerated. Grade 3 or greater TEAEs not related to FT819 primarily included hematologic cytopenias associated with conditioning chemotherapy. There were no study discontinuations or deaths due to TEAEs other than one patient with stable disease who died on Day 38 due to sepsis not considered related to FT819 by the study investigator.
FT819 Patient Case Study: Retreatment to Reinduce Response
The ASH presentation featured a patient case study demonstrating the potential to safely administer more than one treatment cycle of FT819 and reinduce an objective response following disease progression. The 73 year-old female with DLBCL had previously been treated with 4 prior lines of therapy, including commercial autologous CD19-targeted CAR T-cell therapy with best response of PR, and was refractory to last prior therapy (investigational cord blood-derived NK cell therapy). The patient received a first treatment cycle with a single dose of FT819 at 90 million cells, achieving a PR at Day 30 with 94% reduction in size of target lesions. Continued follow-up through
Dose escalation is currently ongoing in Regimen A as a single dose of FT819 at 360 million cells and in Regimen B with three fractionated doses at 60 million cells per dose. The Company has also amended the FT819 study protocol to allow for the use of bendamustine at 90 mg/m2 for 2 days as an alternative to Cy / Flu conditioning chemotherapy.
About Fate Therapeutics’ iPSC Product Platform
The Company’s proprietary induced pluripotent stem cell (iPSC) product platform enables mass production of off-the-shelf, engineered, homogeneous cell products that are designed to be administered with multiple doses to deliver more effective pharmacologic activity, including in combination with other cancer treatments. Human iPSCs possess the unique dual properties of unlimited self-renewal and differentiation potential into all cell types of the body. The Company’s first-of-kind approach involves engineering human iPSCs in a one-time genetic modification event and selecting a single engineered iPSC for maintenance as a clonal master iPSC line. Analogous to master cell lines used to manufacture biopharmaceutical drug products such as monoclonal antibodies, clonal master iPSC lines are a renewable source for manufacturing cell therapy products which are well-defined and uniform in composition, can be mass produced at significant scale in a cost-effective manner, and can be delivered off-the-shelf for patient treatment. As a result, the Company’s platform is uniquely designed to overcome numerous limitations associated with the production of cell therapies using patient- or donor-sourced cells, which is logistically complex and expensive and is subject to batch-to-batch and cell-to-cell variability that can affect clinical safety and efficacy. Fate Therapeutics’ iPSC product platform is supported by an intellectual property portfolio of over 350 issued patents and 150 pending patent applications.
FT819 is an investigational, universal, off-the-shelf, T-cell receptor (TCR)-less CD19 chimeric antigen receptor (CAR) T-cell cancer immunotherapy derived from a clonal master induced pluripotent stem cell (iPSC) line, which is engineered with the following features designed to improve the safety and efficacy of CAR19 T-cell therapy: a novel 1XX CAR signaling domain, which has been shown to extend T-cell effector function without eliciting exhaustion; integration of the CAR19 transgene directly into the T-cell receptor alpha constant (TRAC) locus, which has been shown to promote uniform CAR19 expression and enhanced T-cell potency; and complete bi-allelic disruption of TCR expression for the prevention of graft-versus-host disease. FT819 demonstrated antigen-specific cytolytic activity in vitro against CD19-expressing leukemia and lymphoma cell lines comparable to that of primary CAR T cells, and persisted and maintained tumor clearance in the bone marrow in an in vivo disseminated xenograft model of lymphoblastic leukemia. FT819 is being investigated in a multicenter Phase 1 clinical trial for the treatment of relapsed / refractory B-cell malignancies, including B-cell lymphoma, chronic lymphocytic leukemia, and acute lymphoblastic leukemia (NCT04629729).
This release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 including statements regarding the progress of and plans related to the Company's product candidates and clinical studies, the therapeutic and market potential of the Company’s product candidates, and the Company’s clinical development strategy, including for its product candidate FT819. These and any other forward-looking statements in this release are based on management's current expectations of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, the risk that the Company’s product candidates may not demonstrate the requisite safety or efficacy to warrant further development or to achieve regulatory approval, the risk that results observed in prior studies of the Company’s product candidates, including preclinical studies and clinical trials, will not be observed in ongoing or future studies involving these product candidates, the risk of a delay or difficulties in the manufacturing of the Company’s product candidates or in the initiation and conduct of, or enrollment of patients in, any clinical trials, the risk that the Company may cease or delay preclinical or clinical development of any of its product candidates for a variety of reasons (including requirements that may be imposed by regulatory authorities on the initiation or conduct of clinical trials, changes in the therapeutic, regulatory, or competitive landscape for which the Company’s product candidates are being developed, the amount and type of data to be generated or otherwise to support regulatory approval, difficulties or delays in patient enrollment and continuation in the Company’s ongoing and planned clinical trials, difficulties in manufacturing or supplying the Company’s product candidates for clinical testing, and any adverse events or other negative results that may be observed during preclinical or clinical development), the risk that results observed in preclinical studies of FT819 may not be replicated in ongoing or future clinical trials, and the risk that FT819 may not produce therapeutic benefits or may cause other unanticipated adverse effects. For a discussion of other risks and uncertainties, and other important factors, any of which could cause the Company’s actual results to differ from those contained in the forward-looking statements, see the risks and uncertainties detailed in the Company’s periodic filings with the
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