On June 2, 2025 TuHURA Biosciences, Inc. (NASDAQ:HURA) ("TuHURA"), a Phase 3 immune-oncology company developing novel technologies to overcome resistance to cancer immunotherapy, reported that Moffitt Cancer Center presented a Trial in Progress poster of the Company’s planned Phase 3 accelerated approval trial at the 2025 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting on June 1, 2025, in Chicago, Illinois (Press release, TuHURA Biosciences, JUN 2, 2025, View Source [SID1234653625]).

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The Company’s poster, titled "Multicenter, randomized, double-blinded, placebo-controlled trial of IFx-Hu2.0 (IFx) as adjunctive therapy with pembrolizumab (pembro) in checkpoint inhibitor (CPI)-naïve patients with advanced or metastatic Merkel cell carcinoma (MCC)" details the Company’s Phase 3 accelerated approval trial design of IFx-Hu2.0, its novel innate immune agonist. The Trial in Progress poster was presented by Andrew Brohl, M.D., Medical Oncologist at Moffitt Cancer Center, and highlighted the importance of innate immune system activation in Merkel cell carcinoma patients with primary resistance to checkpoint inhibitors (CPIs).

"Merkel cell carcinoma is a rare and aggressive tumor type. While checkpoint inhibitor therapy has markedly improved the outcome for patients with advanced or metastatic MCC, unfortunately for patients who don’t respond to first line checkpoint inhibitor therapy the survival is poor at less than 30 months.1 Based on the results from our Phase 1 clinical trials, IFx-Hu2.0 intralesional administration has demonstrated it can activate an innate immune response, resulting in the production and activation of tumor specific B cells and T cells, to overcome the primary CPI resistance in both advanced or metastatic MCC or melanoma," stated James Bianco, M.D., President and Chief Executive Officer of TuHURA Biosciences. "We believe we have provided data requested by the FDA that addresses the requirements listed in the partial clinical hold letter to allow us to initiate our Phase 3 accelerated approval trial this month. The FDA was constructive in the trial design, which can potentially satisfy both the requirements for accelerated and regular approval without the requirements for a post approval confirmatory trial. They continue to work with us under the SPA Agreement in preparing the trial’s initiation."

In the Phase 1b trial of IFx-Hu2.0, MCC among patients who progressed on pembrolizumab (anti-PD-1) or avelumab (anti-PDL-1) therapy, weekly administration of IFx-Hu2.0 for up to 3 doses followed by rechallenge with anti-PD(L)-1 therapy, demonstrated an overall response rate of 63% (2CR, 5 PR) with duration of responses ranging from 6 to 33 months with 5 ongoing responses as of last follow-up in June 2024.

The Company’s Phase 3 accelerated approval trial of adjunctive IFx-Hu2.0, to be conducted under a SPA agreement with the U.S. FDA, will evaluate IFx-Hu2.0 (0.1 mg) as an adjunctive therapy administered weekly for three weeks concurrent to pembrolizumab (200 mg) Q3W, compared to the same pembrolizumab regimen plus placebo. The pivotal trial is expected to enroll 118 CPI-naïve patients with advanced or metastatic MCC across approximately 22 to 25 U.S. sites. Trial participants will be randomized on a 1:1 basis and receive CPI therapy for up to two years, or until disease progression or CPI related toxicities. The primary endpoint for the trial is overall response rate (ORR) with a key secondary endpoint of progression free survival (PFS). Other secondary endpoints are safety, duration of response, and overall survival.

The Trial in Progress poster is available on the Scientific Publications page of TuHURA’s website.