Allogene Therapeutics Announces Positive Phase 1 Data Demonstrating the Potential of ALLO-316 in Heavily Pretreated Patients with Advanced Renal Cell Carcinoma at SITC and IKCS

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Phase 1 TRAVERSE Trial Demonstrated a Single Infusion of ALLO-316 Can Yield an Overall Response Rate of 50% and Confirmed Response Rate of 33% in Patients with CD70 Tumor Proportion Score (TPS) of Greater than 50% TRAVERSE Trial Highlights the Ability of CD70 Dagger® Technology to Promote Robust Expansion and Persistence of ALLO-316 with Standard Lymphodepletion, Validating its Potential as the Next Generation Allogeneic Platform ALLO-316 Demonstrated a Manageable Safety Profile; Newly Implemented Diagnostic and Management Algorithm Appears Highly Effective in Abating IEC-HS While Preserving CAR T Efficacy Data from the TRAVERSE Trial Supported the FDA's Recent RMAT Designation for ALLO-316 as a Potential Treatment for Advanced or Metastatic RCC SOUTH SAN FRANCISCO, Calif. , Nov. 07, 2024 (GLOBE NEWSWIRE) -- Allogene Therapeutics, Inc. (Nasdaq: ALLO), a clinical-stage biotechnology company pioneering the development of allogeneic CAR T (AlloCAR T™) products for cancer and autoimmune disease, will concurrently present new data from the Phase 1 TRAVERSE trial in an oral presentation at the 2024 International Kidney Cancer Symposium (IKCS) and a poster session at The Society for Immunotherapy of Cancer's (SITC) Annual Meeting. The trial evaluates ALLO-316, the Company’s first AlloCAR T product candidate for the potential treatment of solid tumors. The ongoing Phase 1 TRAVERSE trial is enrolling patients with advanced or metastatic renal cell carcinoma (RCC) who have progressed following treatment with an immune checkpoint inhibitor and VEGF-targeting therapy. These presentations highlight compelling evidence of CAR T activity and anti-tumor efficacy in 26 patients with RCC tumors known to be CD70 positive who were evaluable for efficacy outcomes. “ALLO-316, the leading “off-the-shelf” CAR T product candidate currently in development for solid tumors, continues to show remarkable potency in the TRAVERSE trial. Data from the Phase 1 study demonstrating significant anti-tumor activity in patients with metastatic disease resistant to multiple therapeutic classes, even with standard lymphodepletion, potentially marks a major advancement in the field,” said Zachary Roberts, M.D., Ph.D., EVP, Research and Development and Chief Medical Officer of Allogene. “The unprecedented cell expansion and persistence driven by CD70 CAR-intrinsic Dagger® technology, along with strong evidence of tumor infiltration by CAR T cells, highlights the distinctive features of ALLO-316. We believe these findings from our Phase 1 trial lay the groundwork for a new generation of allogeneic cell therapies.” As of the October 14, 2024 data cutoff, 39 patients had been enrolled in the ongoing Phase 1 trial, of which 26 were confirmed to have CD70 positive RCC and were evaluable for efficacy outcomes. The median time from enrollment to the start of therapy was five days. Data from dose escalation cohorts and ongoing Phase 1b expansion cohort are included in the presentations. The Phase 1b expansion cohort is evaluating safety and efficacy of ALLO-316 at DL2 (80M CAR T cells) following a standard FC500 (fludarabine (30 mg/m2/day) and cyclophosphamide (500 mg/m2/d) for 3 days) lymphodepletion regimen. The Phase 1b expansion cohort is expected to ultimately include approximately 20 patients. Additional data from the Phase 1b expansion cohort is expected to be announced in mid-2025. Following a single infusion of ALLO-316 in heavily pretreated patients, the trial demonstrated best Overall Response Rate (ORR) of 50% and Confirmed Response Rate of 33% in those patients with CD70 Tumor Proportion Score (TPS) of ≥50% who received DL2. Patients with a TPS of ≥50% comprise the majority of patients with advanced or metastatic RCC. Of those with a TPS ≥50, 76% (16/21) experienced a reduction in tumor burden. Two of six (33%) patients with high TPS who received the Phase 1b expansion regimen showed durable responses ongoing at ≥4 months. Response Rates by CD70 Status and Dose Patients Evaluable for Disease Outcomesa (N=34) CD70 Positive (N=26) CD70 Negative or Unknown (N=8) All(N=26) FCA b(N=8) FCc(N=18) DL2 FC500 (Phase 1b)(N=8) Best overall response,d n/N (%) High TPS (≥50) Low TPS (

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