Company: HURA
Filing Date: 2025-05-06
Form Type: S-4/A
Source: 0001193125-25-113920
Chunk: 422

Company: TuHURA Biosciences, Inc./NV
Filing Date: 2025-05-06
Form: S-4/A
Chunk 422
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 to the FDA, if achieved without a detrimental effect on overall survival, or OS, could be adequate to support conversion to regular approval satisfying the requirement for a confirmatory trial. Notwithstanding the foregoing, the results of clinical trials are inherently uncertain, and the results of TuHURA’s planned Phase 3 clinical trial may fail to satisfy the ORR, PFS, and/or OS endpoints, and none of TuHURA’s prior clinical trials with respect to IFx-2.0 were powered to determine statistical significance over a control.

As set forth in a January 2024 partial clinical trial hold letter from the FDA regarding the chemistry, manufacturing, and controls (CMC) requirements for our planned Phase 3 trial for IFx-2.0 to be conducted under the Special Protocol Assessment agreement, the FDA is requiring that, prior to initiating the trial, we must qualify potency assay and the mixing process for IFx-2.0. We have reached agreement with FDA on the requirements for lifting the partial clinical hold and believe we will meet the requirements and consequently expect to receive a complete response letter, or CRL, lifting the partial clinical hold in the second quarter of 2025. We may be in position to initiate the Phase 3 study in the second quarter of 2025 if the results of the mixing studies and potency assay qualifications are acceptable to the FDA, but there is no assurance that we will be able to satisfy the requirements set forth in the partial clinical trial hold letter on a timely basis or at all. We anticipate that enrollment for the Phase 3 would take approximately 12 months, with top-line data potentially**

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**being available 6 to 7 months following the last patient enrolled. If successful, this Phase 3 trial would form the basis of a Biologics License Application, or BLA. A Special Protocol Assessment agreement is a binding written agreement between the U.S. Food and Drug Administration (FDA) and a trial sponsor that indicates the study’s design and analysis are adequate to support an application submission. A Special Protocol Assessment agreement does not increase the likelihood of marketing approval for the product and may not lead to a faster or less costly development, review, or approval process.

We are also developing our IFx-3.0 product candidate, an mRNA innate immune agonist candidate for intravenous or autologous whole cell administration for blood-related cancers, to expand the utility of our IFx technology to tumor types not accessible by intra-tumoral injection.