Company: HURA
Filing Date: 2025-09-18
Form Type: S-1/A
Source: 0001193125-25-207395
Chunk: 103

Company: TuHURA Biosciences, Inc./NV
Filing Date: 2025-09-18
Form: S-1/A
Chunk 103
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.0. In the first stage (exposure escalation), a 3+3 trial design was utilized to assess safety of repeated weekly intratumoral injections using a fixed dose of IFx-2.0 weekly for 1, 2 or 3 weeks (for cohorts 1, 2 or 3 respectively). Following safety evaluation the protocol was amended to include an expansion stage to increase the total study sample size to 20. A total of 23 patients were enrolled. As of June 2024, follow-up data was available on all evaluable patients.

The primary objective of the trial was to determine the safety, tolerability, and optimal dose and schedule of IFx-2.0 when administered intratumoral in up to three lesions injected across three different administration

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schedules. Safety was evaluated for up to 28 days following IFx-2.0 administration. Secondary objectives include tumor shrinkage (injected and non-injected lesions) and correlative immune response analysis (transcriptomic, proteomic, humoral and cellular), pre-and post-IFx-2.0 administration to guide the choice of dose and schedule for the Company’s Phase 3 registration directed trial.

Twenty-three (23) patients were enrolled: Merkel cell carcinoma (13), cSCC (10). Among the thirteen (13) patients with Merkel cell carcinoma, twelve (12) completed treatment and the protocol directed 28 day safety evaluation follow up period; One (1) patient experienced a serious adverse event, or SAE, deemed possibly related to study drug. This patient experienced a Grade 3, or G3, adverse event, which is defined as an adverse event that is a severe or medically significant event that is not immediately life threatening, which in the case of this patient was a G3 autoimmune hepatitis that resolved with steroid treatment, and such patent has been recently treated with checkpoint inhibitors prior to study enrollment. Among the ten (10) patients with cSCC one (1) patient experienced an SAE unrelated to study drug and did not complete treatment nor the 28 day safety evaluation follow up period. All patients had received prior anti-PD(L)1 based treatment with disease progression being the reason for CPI discontinuation in all patients but one. Intra-tumoral (IT) IFx-2.0 was well tolerated at all dose schedules evaluated. As to efficacy, in the 21 patients that completed the study, best overall disease response to trial therapy was