Genprex to Focus Its Clinical Efforts on Oncoprex in Combination Therapy with Osimertinib for Non-Small Cell Lung Cancer (NSCLC)

Genprex, Inc. (“Genprex” or the “Company”) (Nasdaq: GNPX), a clinical-stage gene therapy company utilizing a unique, non-viral proprietary platform designed to deliver tumor suppressor genes to cancer cells, today provides a clinical update and focus for its Oncoprex immunogene therapy program for 2020, prioritizing the development of Oncoprex in combination with osimertinib for the treatment of non-small cell lung cancer (NSCLC).

On January 14, 2020, the Company received U.S Food and Drug Administration (FDA) Fast Track Designation for its Oncoprex immunogene therapy in combination with the EGFR tyrosine kinase inhibitor (TKI) osimertinib (AstraZeneca’s Tagrisso, which had worldwide sales in 2018 of $1.86 billion and $2.31 billion in the first nine months of 2019, and it is currently AstraZeneca’s highest grossing product) for the treatment of NSCLC patients with EFGR mutations that progressed after treatment with osimertinib alone. Oncoprex consists of the TUSC2 (Tumor Suppressor Candidate 2) gene, the active agent in Oncoprex, complexed with a lipid nanovesicle.

The Company’s current Phase I/II clinical trial utilizes the combination of the EGFR inhibitor erlotinib (marketed by Genentech in the U.S. and elsewhere by Roche as Tarceva) and Oncoprex against NSCLC. The current Phase I/II trial is active but is not currently enrolling patients, though the Company had planned to resume enrollment in mid-2020. Tumor shrinkage in patients resistant to erlotinib enrolled in this trial showed that Oncoprex can overcome resistance to TKIs and provided support for the Fast Track Designation.

Osimertinib is now considered a new standard of care for NSCLC patients with an EGFR mutation. Given this and receipt of FDA’s Fast Track Designation for use of Oncoprex combined with osimertinib in patients whose tumors progress on osimertinib, the Company has decided to prioritize this drug combination and patient population. Therefore, the Company plans to initiate a Phase I/II clinical trial of Oncoprex combined with osimertinib in mid-2020 at multiple cancer centers across the United States, and it does not intend to reopen enrollment in the current Phase I/II trial using the combination of Oncoprex and erlotinib at this time.