On June 3, 2023 Allogene Therapeutics, Inc. (Nasdaq: ALLO), a clinical-stage biotechnology company pioneering the development of allogeneic CAR T (AlloCAR T) products for cancer, reported long-term follow up data from the Phase 1 ALPHA/ALPHA2 trials of ALLO-501/501A in patients with relapsed/refractory (r/r) large B-cell lymphoma (LBCL) at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting in Chicago, Illinois (Press release, Allogene, JUN 3, 2023, View Source [SID1234632413]). These data will also be presented in a poster session at the European Hematology Association (EHA) (Free EHA Whitepaper) Hybrid Congress on June 9, 2023.

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"We are excited to be the first to demonstrate the potential of allogeneic CD19 CAR T to induce durable complete remissions at a rate similar to approved autologous CD19 CAR T therapies. Our Phase 2 regimen also had a safety profile, including immune recovery, in line with approved options," said Zachary Roberts, M.D., Ph.D., Executive Vice President, Research & Development and Chief Medical Officer. "We believe our AlloCAR T product candidates have the potential to break down widespread access barriers to CAR T, and ultimately establish a new paradigm in cell therapy. These data underlie the excitement we and investigators have for our ongoing potentially pivotal Phase 2 ALPHA2 trial."

The updated analysis of ALPHA/ALPHA2 examined data from 12 CAR T-naïve patients with r/r LBCL who received a single dose of ALLO-501/501A manufactured using the Alloy process following a lymphodepletion regimen (FCA90) comprised of fludarabine (30 mg/m2/day x 3 days) and cyclophosphamide (300 mg/m2/day x 3 days) plus ALLO-647 (30 mg/day x 3 days). The median time from enrollment to the start of therapy was three days and all 12 patients were followed through a minimum of six months (data cutoff April 20, 2023).

Patients Treated with Phase 2 Regimen
(n=12)
Overall Response Rate (ORR), n (%) 8 (67)
Complete Response Rate (CR), n (%) 7 (58)
6 Month Complete Response, n (%) 5 (42)
As of the data cutoff, 7 of 12 (58%) patients achieved a CR and five (42%) maintained a CR through Month 6. Of the five patients who were in CR at 6 months, four (80%) remained in CR. The fifth patient had disease progression at 24 months. The median duration of response was 23.1 months with three patients remaining in remission for over 24 months and the longest remaining in remission for over 31 months.

All r/r CAR T naïve LBCL (N=33) Patients Treated with Phase 2 Regimen (N=12)
All Gr
N (%) Gr 3+
N (%) All Gr
N (%) Gr 3+
N (%)
CRS 8 (24) 0 4 (33) 0
ICANS 0 0 0 0
Neurotoxicity 13 (39) 2 (6) 4 (33) 0
GvHD 0 0 0 0
IRR 16 (49) 3 (9) 8 (67) 0
Infection 19 (58) 5 (15) 8 (67) 1 (8)
Prolonged Gr3+ Cytopenia - 4 (12) - 2 (17)
A safety analysis of 33 CAR T-naïve LBCL patients receiving Alloy process ALLO-501/501A product candidates at any dose and lymphodepletion schedule, including the 12 patients treated with the Phase 2 regimen, was also conducted. Treatment was generally well tolerated with no incidences of Grade 3 or greater cytokine release syndrome, and no cases of immune effector cell-associated neurotoxicity syndrome or graft versus host disease. Cytopenias and infections were manageable and comparable to the experience with autologous CAR T cell therapies in patients with r/r LBCL.

The ALPHA/ALPHA2 Phase 1 trials were designed to assess the safety, tolerability, and preliminary efficacy at increasing dose levels of ALLO-501 and ALLO-501A, allogeneic CAR T cell product candidates that target CD19. In addition to exploring cell doses, these studies evaluated various doses of ALLO-647, Allogene’s proprietary lymphodepleting antibody designed to prevent premature rejection of AlloCAR T cells. Allogene is currently enrolling the potentially pivotal Phase 2 ALPHA2 trial of ALLO-501A in LBCL and expects to complete enrollment in 1H2024.

About ALLO-501 and ALLO-501A
ALLO-501 and ALLO-501A are anti-CD19 AlloCAR T investigational products for the treatment of large B cell lymphoma. ALLO-501A, a next-generation anti-CD19 AlloCAR T, eliminates the rituximab recognition domains in ALLO-501, which could allow for use in a broader patient population, including NHL patients with recent rituximab exposure. This product candidate is currently being studied in an ongoing potentially pivotal Phase 2 trial. In June 2022, the U.S. Food and Drug Administration granted Regenerative Medicine Advanced Therapy (RMAT) designation to ALLO-501A in r/r LBCL.