Chief Medical Officer Provides Overview of Recent Positive Clinical Patient Outcomes

Video Highlights Recent Oncology Clinical Development Program Updates

AUSTIN, Texas — (Aug. 15, 2024) — 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 released a new video featuring the Company's Chief Medical Officer, Mark Berger, MD, discussing positive clinical study updates from its Acclaim-1 and Acclaim-3 Phase 1/2 clinical trials in lung cancer and recent updates to the Company's oncology clinical development program.

Click here to watch the video.

The Acclaim-1 clinical trial is evaluating the combination of the Company's lead drug candidate, Reqorsa Gene Therapy, and AstraZeneca's Tagrisso to treat patients with late-stage NSCLC who have activating EGFR mutations and disease progression after treatment with Tagrisso.

The Acclaim-3 clinical trial is evaluating the combination of REQORSA and Genentech's Tecentriq as a maintenance therapy to treat patients with extensive stage small cell lung cancer (ES-SCLC) who did not develop tumor progression after receiving Tecentriq and chemotherapy as initial standard treatment.

Dr. Berger remarked on the two positive patient outcomes in Acclaim-1:

"Both of these patients' outcomes are fairly remarkable in terms of their prolonged Progression Free Survival (PFS) among patients in the study who were progressing on their previous treatment when they came into the study. It's very compelling, particularly, that one of those patients has maintained this benefit for more than two years. And over time, the patients' side effects with the combination of REQORSA and Tagrisso have diminished rather than increased over time."

Dr. Berger's commentary on the positive patient outcome in Acclaim-3:

"In the Acclaim-3 study, the first patient treated in the Phase 1 dose escalation portion of the trial has had a positive response since enrollment and starting maintenance therapy. The patient has a partial remission (PR) from the start of maintenance therapy until after the second course, which is when the first CT scan is done. This is the first dose group in this study, and there is a second higher dose group to come. The patient's response is remarkable, and it is very unusual to have a PR during maintenance therapy. We believe these results bode very well for the study."

On recent updates to the Company's oncology clinical development program, Dr. Berger stated:

"To build on these positive patient results, we are making changes to our clinical development program both in the Acclaim-1 and Acclaim-2 studies. In the Acclaim-1 study, we are removing one of the cohorts in Phase 2a, which will allow us to advance more quickly. The Acclaim-2 study is being closed to further enrollment. It has been slow to enroll patients, mainly because there are hundreds of other very similar studies that evaluate new treatments after patients have progressed on Keytruda. We certainly intend to continue to treat patients in this study until they have disease progression. We also believe closing to further enrollment is the right thing to do so that we can focus our limited resources on the fastest way to being able to enroll patients and get clinical data.

We're very excited by these positive patient responses, and we look forward to advancing REQORSA through the clinic. We believe that streamlining our efforts to do so is the best way to use our resources and to move our program forward."

To watch the video, please visit Genprex's website at .