Genprex Collaborators Find NPRL2 Gene Therapy Using Oncoprex® Delivery System is a Potential Treatment for Anti-PD1 Resistant Non-Small Cell Lung Cancer
New publication indicates that NPRL2 gene therapy has marked single-agent activity in anti-PD1 resistant non-small cell lung cancer xenografts
AUSTIN, Texas, Feb. 13, 2025 /PRNewswire/ -- Genprex, Inc. ("Genprex" or the "Company") (NASDAQ:GNPX), a clinical-stage gene therapy company focused on developing life-changing therapies for patients with cancer and diabetes, today announced that its research collaborators at a major cancer research center in Houston, Texas have published a new study in eLife titled, "NPRL2 gene therapy induces effective antitumor immunity in KRAS/STK11 mutant anti-PD1 resistant metastatic non-small cell lung cancer (NSCLC) in a humanized mouse model."
"We are thrilled by the continued advancements of our academic partners on the NPRL2 gene therapy, which supports the therapeutic potential of our non-viral Oncoprex® Delivery System to deliver the NPRL2 tumor suppressor gene therapy," said Ryan Confer, President and Chief Executive Officer at Genprex. "These data indicate the single agent potential of NPRL2 in lung cancer. They also demonstrate that the Oncoprex Delivery System used in Reqorsa® Gene Therapy with the TUSC2 tumor suppressor gene is a platform and can be used with other tumor suppressor genes, such as NPRL2. We are pleased that these positive data also support the therapeutic potential of NPRL2 gene therapy in NSCLC and positions Genprex for the expansion of our clinical development pipeline."
The studies used the Company's non-viral ONCOPREX Delivery System in KRAS/STK11 double mutant anti-PD1 resistant metastatic NSCLC xenografts in humanized mouse models. The ONCOPREX Delivery System is a novel non-viral approach utilizing lipid nanoparticles to deliver tumor suppressor genes that have been deleted during the course of cancer development. The platform allows for the intravenous delivery of various tumor suppressor genes to achieve a therapeutic effect without the risk of toxicity often associated with viral delivery systems.
In the published study, humanized mice were treated with NPRL2 gene therapy, immunotherapy pembrolizumab (Keytruda®), or the combination. A dramatic antitumor effect was mediated by NPRL2 treatment alone, whereas pembrolizumab alone was ineffective, and the combination added little to NPRL2 treatment alone.
A significant antitumor effect was also found in non-humanized NSG mice, although the antitumor effect was greater in humanized mice, suggesting that the effects of NPRL2 gene therapy are achieved through the immune system. This is consistent with a more detailed analysis showing that NPRL2 gene therapy induces antitumor activity against KRAS/STK11 mutant anti-PD1 resistant tumors through dendritic cell mediated antigen presentation and cytotoxic immune cell activation. KRAS/STK11 mutant tumors are particularly resistant to treatment, and demonstrating efficacy in this setting suggests that a wide variety of lung cancers could potentially be targeted. This potentially would include the approximately 30% of NSCLCs that have KRAS mutations.
About Reqorsa® Gene Therapy
REQORSA (quaratusugene ozeplasmid) consists of a plasmid containing the TUSC2 gene encapsulated in non-viral lipid-based nanoparticles in a lipoplex form (the Company's Oncoprex® Delivery System), which has a positive charge. REQORSA is injected intravenously and specifically targets cancer cells. REQORSA is designed to deliver the functioning TUSC2 gene to negatively charged cancer cells while minimizing uptake by normal tissue. Laboratory studies conducted at MD Anderson show that the uptake of TUSC2 in tumor cells in vitro after REQORSA treatment was 10 to 33 times the uptake in normal cells.
About Genprex, Inc.
Genprex, Inc. is a clinical-stage gene therapy company focused on developing life-changing therapies for patients with cancer and diabetes. Genprex's technologies are designed to administer disease-fighting genes to provide new therapies for large patient populations with cancer and diabetes who currently have limited treatment options. Genprex works with world-class institutions and collaborators to develop drug candidates to further its pipeline of gene therapies in order to provide novel treatment approaches. Genprex's oncology program utilizes its systemic, non-viral Oncoprex® Delivery System which encapsulates the gene-expressing plasmids using lipid-based nanoparticles in a lipoplex form. The resultant product is administered intravenously, where it is taken up by tumor cells that then express tumor suppressor proteins that were deficient in the tumor. The Company's lead product candidate, Reqorsa® Gene Therapy (quaratusugene ozeplasmid), is being evaluated in two clinical trials as a treatment for NSCLC and SCLC. Each of Genprex's lung cancer clinical programs has received a Fast Track Designation from the FDA for the treatment of that patient population, and Genprex's SCLC program has received an FDA Orphan Drug Designation. Genprex's diabetes gene therapy approach is comprised of a novel infusion process that uses an AAV vector to deliver Pdx1 and MafA genes directly to the pancreas. In models of Type 1 diabetes, GPX-002 transforms alpha cells in the pancreas into functional beta-like cells, which can produce insulin but may be distinct enough from beta cells to evade the body's immune system. In a similar approach for Type 2 diabetes, where autoimmunity is not at play, GPX-002 is believed to rejuvenate and replenish exhausted beta cells.
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Cautionary Language Concerning Forward-Looking Statements
Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are made on the basis of the current beliefs, expectations and assumptions of management, are not guarantees of performance and are subject to significant risks and uncertainty. These forward-looking statements should, therefore, be considered in light of various important factors, including those set forth in Genprex's reports that it files from time to time with the Securities and Exchange Commission and which you should review, including those statements under "Item 1A – Risk Factors" in Genprex's Annual Report on Form 10-K for the year ended December 31, 2023.
Because forward-looking statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding: Genprex's ability to advance the clinical development, manufacturing and commercialization of its product candidates in accordance with projected timelines and specifications; the timing and success of Genprex's clinical trials and regulatory approvals, the effect of Genprex's product candidates, alone and in combination with other therapies, on cancer and diabetes; the effects of any strategic research and development prioritization initiatives, and any other strategic alternatives or other efforts that Genprex takes or may take in the future that are aimed at optimizing and re-focusing Genprex's diabetes, oncology and/or other clinical development programs including prioritization of resources, and the extent to which Genprex is able to implement such efforts and initiatives successfully to achieve the desired and intended results thereof; Genprex's future growth and financial status, including Genprex's ability to maintain compliance with the continued listing requirements of The Nasdaq Capital Market and to continue as a going concern and to obtain capital to meet its long-term liquidity needs on acceptable terms, or at all; Genprex's commercial and strategic partnerships, including those with its third party vendors, suppliers and manufacturers and their ability to successfully perform and scale up the manufacture of its product candidates; and Genprex's intellectual property and licenses.
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