# EDGAR Filing Document

**Accession Number:** 0001506184
**File Stem:** 0001193125-25-236083
**Filing Date:** 2025-10
**Character Count:** 10699
**Document Hash:** 49edd06bf72ee2163e7a102af1db3b3d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-236083.hdr.sgml**: 20251009

**ACCESSION NUMBER**: 0001193125-25-236083

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20251009

**FILED AS OF DATE**: 20251009

**DATE AS OF CHANGE**: 20251009

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IMMUTEP Ltd
- **CENTRAL INDEX KEY:** 0001506184
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** C3
- **FISCAL YEAR END:** 0630

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35428
- **FILM NUMBER:** 251385919

**BUSINESS ADDRESS:**
- **STREET 1:** LEVEL 32, SUITE 32.07 AUSTRALIA SQUARE
- **STREET 2:** 264 GEORGE STREET
- **CITY:** SYDNEY,
- **STATE:** C3
- **ZIP:** NSW 2000
- **BUSINESS PHONE:** 612 8315 7003

**MAIL ADDRESS:**
- **STREET 1:** LEVEL 32, SUITE 32.07 AUSTRALIA SQUARE
- **STREET 2:** 264 GEORGE STREET
- **CITY:** SYDNEY,
- **STATE:** C3
- **ZIP:** NSW 2000

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Prima BioMed Ltd
- **DATE OF NAME CHANGE:** 20101119

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM 6-K** 

**REPORT OF FOREIGN PRIVATE ISSUER** 

**PURSUANT TO RULE 13a-16 OR 15d-16** 

**UNDER THE SECURITIES EXCHANGE ACT OF 1934** 

**Date as October 09, 2025** 

**Commission File Number 001-35428** 

## IMMUTEP LIMITED
**(Exact Name as Specified in its Charter)** 

**N/A** 

**(Translation of Registrant's Name)** 

**Level 32, Australia Square** 

**264 George Street, Sydney** 

**NSW 2000, Australia** 

**(Address of principal executive office)** 

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes ☐ No ☒

If "Yes" is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): Not applicable.

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**EXHIBIT INDEX** 

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| | |
|:---|:---|
| **Exhibit** | **Description of Exhibit** |
| 99.1 | [Immutep Announces Update for TACTI-004 (KEYNOTE-F91) Phase III Trial in First Line Non-Small Cell Lung Cancer](d62582dex991.htm) |

---

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**SIGNATURES** 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: October 09, 2025

---

| | |
|:---|:---|
| IMMUTEP LIMITED | IMMUTEP LIMITED |
| By: | /s/ Marc Voigt |
| Name: | Marc Voigt |
| Title: | Chief Executive Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g62582snap5.jpg)

**Immutep Announces Update for TACTI-004 (KEYNOTE-F91)** 

**Phase III Trial in First Line Non-Small Cell Lung Cancer** 

• *Global Phase III trial has enrolled and randomised over 170 patients, reaching an important milestone as this is above the amount needed to conduct the futility analysis* 

• *Over 100 clinical sites across 24 countries now activated and open for recruitment* 

• *Futility analysis remains on track for completion in the first quarter of CY2026* 

**SYDNEY, AUSTRALIA – October 09, 2025 –** Immutep Limited (ASX: IMM; NASDAQ: IMMP) ("Immutep" or "the Company"), a late-stage immunotherapy company targeting cancer and autoimmune diseases, today announces a patient enrolment update for the TACTI-004 (KEYNOTE-F91) Phase III trial evaluating eftilagimod alfa (efti) in combination with MSD's (Merck & Co., Inc., Rahway, NJ, USA) anti-PD-1 therapy KEYTRUDA<sup>®</sup> (pembrolizumab) and chemotherapy as first line treatment for advanced or metastatic non-small cell lung cancer (1L NSCLC).

This registrational Phase III trial has enrolled and randomised over 170 patients, reaching an important milestone as this is above the amount necessary to conduct the futility analysis. Additionally, the number of activated clinical trial sites continues to expand at a strong pace and there are now over 100 active clinical sites across 24 countries globally.

The futility analysis will be assessed by an independent data monitoring committee (IDMC) based on the data of a predefined number of patients with sufficient follow-up (minimum 12 weeks) and predefined criteria for efficacy. The trial remains on track for the IDMC to conduct the futility analysis in the first quarter of CY2026.

**Immutep Chief Executive Officer, Marc Voigt, said,** "We are very pleased with the pace of enrolment in our pivotal Phase III trial that we believe has the potential to change the treatment landscape in non-small cell lung cancer, one of the largest indications in oncology with over two million diagnoses annually worldwide. The trial remains on track for key milestones ahead including futility analysis in early 2026."

**Immutep CMO, Stephan Winckels, M.D., Ph.D., added**, "Our engagement with the principal investigators and physicians in the lung cancer community at medical conferences throughout the year, including WCLC 2025 last month, has consistently resulted in constructive feedback. Notably, their favourable assessments of the trial design and of efti as an innovative immunotherapy—capable of safely increasing response rates and improving efficacy in non-small cell lung cancer patients regardless of PD-L1 expression—provide a strong basis for ongoing positive enrolment trends."

The TACTI-004 trial follows positive efficacy and safety results from two previous studies, TACTI-002 and INSIGHT-003, which tested efti with KEYTRUDA in 1L NSCLC. With in total over 165 patients enrolled, both trials demonstrate that efti enhances anti-PD-1 therapy regardless of PD-L1 expression levels. The novel combination of these two immunotherapies has led to high response rates and strong progression-free survival (PFS). Both trials show these responses and PFS translate into significantly improved overall survival, addressing a high unmet need for these patients.

![LOGO](g62582snap6.jpg)

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Lung cancer is the leading cause of death among all cancer types and the incidence is set to increase to approximately 3 million cases worldwide by 2030.<sup>1</sup> NSCLC is the most common type of lung cancer representing ~80-85% of all diagnoses.<sup>2</sup> The condition is often diagnosed at a late stage, and less than 30% of patients are alive five years after diagnosis.<sup>3,4</sup> There remains a high unmet need for additional treatment options for people living with NSCLC.

KEYTRUDA<sup>®</sup> is a registered trademark of Merck Sharp & Dohme LLC, a subsidiary of Merck & Co., Inc., Rahway, NJ, USA.

**About TACTI-004** 

TACTI-004 (**T**wo **ACT**ive **I**mmunotherapies) is a randomised, double-blind, controlled Phase III study evaluating eftilagimod alfa (efti), a first-in-class MHC Class II agonist, in combination with MSD's (Merck & Co., Inc., Rahway, NJ, USA) anti-PD-1 therapy KEYTRUDA<sup>®</sup> (pembrolizumab) and chemotherapy as first line therapy for patients with advanced or metastatic non-small cell lung cancer with no EGFR, ALK or ROS1 genomic tumour aberrations. The global trial will enrol approximately 756 patients regardless of PD-L1 expression and with non-squamous or squamous tumours at over 150 clinical sites in over 25 countries. Patients will be randomised 1:1 to receive either efti in combination with pembrolizumab and chemotherapy in the treatment arm or pembrolizumab in combination with chemotherapy and placebo in the control arm. The study's dual primary endpoints are progression-free survival and overall survival.

**About Eftilagimod Alfa (Efti)** 

Efti is a novel immunotherapy that directly activates antigen-presenting cells or APCs (e.g. dendritic cells, monocytes) via the MHC Class II pathway to fight cancer. As an MHC Class II agonist, its activation of APCs engages the adaptive and innate immune system to initiate a broad anti-cancer immune response. This includes priming and activating cytotoxic T cells as well as generating important co-stimulatory signals & cytokines that further boost the immune system's ability to combat cancer.

Efti is under evaluation for a variety of solid tumours including non-small cell lung cancer (NSCLC) in a pivotal Phase III trial called TACTI-004 (KEYNOTE-F91), as well as head and neck squamous cell carcinoma (HNSCC), soft tissue sarcoma, and breast cancer. Its favourable safety profile enables various combinations like with anti-PD-[L]1 immunotherapy, radiotherapy, and/or chemotherapy. Efti has received Fast Track designation in first line HNSCC and in first line NSCLC from the United States Food and Drug Administration (FDA).

**About Immutep** 

Immutep is a late-stage biotechnology company developing novel immunotherapies for cancer and autoimmune disease*.* The Company is a pioneer in the understanding and advancement of therapeutics related to Lymphocyte Activation Gene-3 (LAG-3), and its diversified product portfolio harnesses LAG-3's ability to stimulate or suppress the immune response. Immutep is dedicated to leveraging its expertise to bring innovative treatment options to patients in need and to maximise value for shareholders. For more information, please visit www.immutep.com.

![LOGO](g62582snap6.jpg)

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*1. International Agency for Research on Cancer – World Health Organization. Rates of trachea, bronchus and lung cancer.* 

*2. Zappa C & Mousa Non-small cell lung cancer: current treatment and future advances, Transl Lung Cancer Res. 2016 Jun; 5(3): 288–300.* 

*3. Polanco D et al. Prognostic value of symptoms at lung cancer diagnosis: a three-year observational study. J Thorac Dis 2021;13:1485–1494.* 

*4. National Cancer Institute Surveillance, Epidemiology, and End Results (SEER) - https://seer.cancer.gov/statfacts/html/lungb.html* 

**Australian Investors/Media:** 

Eleanor Pearson, Sodali & Co.

+61 2 9066 4071; eleanor.pearson@sodali.com

**U.S. Investors/Media:** 

Chris Basta, VP, Investor Relations and Corporate Communications

+1 (631) 318 4000; chris.basta@immutep.com

This announcement was authorised for release by the CEO of Immutep Limited.

![LOGO](g62582snap6.jpg)