Company: PGEN
Filing Date: 2025-03-19
Form Type: 10-K
Source: 0001356090-25-000007
Chunk: 24

Company: PRECIGEN, INC.
Filing Date: 2025-03-19
Form: 10-K
Item: Item 1
Chunk 24
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 designed our MUC16 CAR using an antigen binding domain that specifically binds the unshed portion of MUC16 and optimized its affinity to preferentially target PRGN-3005 to tumor cells.

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Advanced ovarian cancer is often fatal, with Stage IV survival rates as low as 20 percent, and has limited treatment options. Patients with ovarian cancer represent a large population, with approximately 300,000 patients diagnosed worldwide annually, including 22,000 in the United States alone.

In preclinical in vitro studies, PRGN-3005 UltraCAR-T has shown robust MUC16-specific cytotoxicity of ovarian cancer cell lines, a stem-cell like memory phenotype and significant improvement in their longevity even in the absence of exogenous cytokines as compared to conventional CAR-T cells. PRGN-3005 UltraCAR-T cells have shown significantly superior anti-tumor response in mouse models of ovarian cancer compared to mice treated with a saline solution or conventional MUC16 CAR-T cells lacking mbIL15 expression. These data demonstrated the potential of UltraCAR-T cells to persist long-term in vivo, prevent CAR-T cell exhaustion, and mount a durable anti-tumor response with the ability to continue to respond upon tumor rechallenge.

PRGN-3005 is in a 1/1b clinical trial designed to enroll in two phases, an initial dose escalation phase (Phase 1) followed by a dose expansion phase (Phase 1b). We have completed the Phase 1 dose escalation portion of the PRGN-3005 Phase 1/1b study. The Phase 1 portion of the study is a dual-arm, non-randomized, open-label clinical trial in patients with advanced, recurrent platinum-resistant ovarian, fallopian tube or primary peritoneal cancer. Patients in the Phase 1 dose escalation trial received either intraperitoneal, or IP (Arm 1), or intravenous, or IV (Arm 2), administration of PRGN-3005 without prior lymphodepletion. After receiving FDA clearance, we also incorporated a cohort with lymphodepletion at Dose Level 3 of the IV arm in the Phase 1 study. The primary objectives of the Phase 1 trial included assessment of safety and maximum tolerated dose, or MTD, of PRGN-3005.

 The Phase 1 study enrolled a total of 27 patients (N=12 IP; N=6 IV; and N=9 IV with lymphodepletion). Patients were heavily pretreated with a median of greater than or equal to 8