Company: PGEN
Filing Date: 2025-03-19
Form Type: 10-K
Source: 0001356090-25-000007
Chunk: 30

Company: PRECIGEN, INC.
Filing Date: 2025-03-19
Form: 10-K
Item: Item 1
Chunk 30
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 the downregulation of PD-1 expression on PRGN-3007 resulted in a significantly higher number of polyfunctional CAR-T cells compared to Control ROR1 CAR-T. PRGN-3007 showed robust expansion in presence of ROR1 antigen, lack of autonomous expansion in absence of ROR1, and durable persistence even in absence of exogenous cytokines in vitro. PRGN-3007 was selectively and effectively eliminated by the kill switch activator treatment demonstrating functionality of the kill switch, which is intended to improve the safety profile of PRGN-3007. In preclinical in vivo testing, a single administration of PRGN-3007, only one day after gene transfer, effectively reduced tumor burden and significantly improved overall survival of tumor bearing mice compared to Control ROR1 CAR-T in an aggressive xenograft model of mantle cell lymphoma. Blood analyses demonstrated sustained downregulation of PD-1 expression, rapid expansion, long-term persistence, and a predominant central memory phenotype of PRGN-3007 in tumor bearing mice.

The Phase 1/1b clinical trial is designed as an open-label study designed to evaluate the safety and efficacy of PRGN-3007 in patients with advanced ROR1+ hematological (Arm 1) and solid (Arm 2) tumors. The target patient population for Arm 1 includes relapsed or refractory CLL, relapsed or refractory MCL, relapsed or refractory B-ALL, and relapsed or refractory DLBCL. The target patient population for Arm 2 includes locally advanced unresectable or metastatic histologically confirmed TNBC. The study will enroll in two parts: an initial 3+3 dose escalation in each arm followed by a dose expansion at the maximum tolerated dose. As part of the strategic prioritization of our pipeline announced in August 2024, we have paused enrollment in the Phase 1 clinical trial of PRGN-3007.

Preclinical Programs

We have a robust pipeline of preclinical programs in order to drive long-term value creation. Our pipeline includes product candidates based on UltraCAR-T and "off-the-shelf" AdenoVerse immunotherapy therapeutic platforms. We expect to continue development of a number of potential product candidates in our preclinical pipeline and, consistent with our commitment to actively manage our portfolio programs, we exercise discipline in our portfolio management by systematically evaluating data from our preclinical programs in order to make rapid "go" and "no go" decisions. Through this process, we believe we can more