# EDGAR Filing Document

**Accession Number:** 0001506184
**File Stem:** 0001193125-25-211928
**Filing Date:** 2025-9
**Character Count:** 9272
**Document Hash:** f9aea050788be9214b67cfe97c1fa897
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-211928.hdr.sgml**: 20250923

**ACCESSION NUMBER**: 0001193125-25-211928

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20250922

**FILED AS OF DATE**: 20250923

**DATE AS OF CHANGE**: 20250922

**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:** 251331553

**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 September 22, 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 Research Collaboration with the George Washington University Cancer Center to Evaluate Neoadjuvant Efti](d76406dex991.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: September 22, 2025

---

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

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g76406snap5.jpg)

**Immutep Announces Research Collaboration with the George** 

**Washington University Cancer Center to Evaluate Neoadjuvant Efti** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• *GW Cancer Center to initiate Phase II trial evaluating neoadjuvant   efti as monotherapy and in combination with chemotherapy prior to surgery in HR+/HER2-neg breast cancer patients* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• *Second investigator-initiated trial to evaluate efti in earlier stage disease where its unique activation of a broad anti-cancer immune response may drive optimal benefit and high pathologic response rates* 

**SYDNEY, AUSTRALIA – September 22, 2025 –** <u>Immutep Limited</u> (ASX: IMM; NASDAQ: IMMP) ("Immutep" or "the Company"), a late-stage immunotherapy company targeting cancer and autoimmune diseases, today announces the initiation of an investigator-initiated Phase II trial evaluating neoadjuvant eftilagimod alfa (efti) administered subcutaneously as monotherapy and then in combination with standard-of-care chemotherapy prior to surgery in patients with early-stage HR+/HER2-negative breast cancer.

The study will treat up to 50 evaluable patients in a two-stage design and will be primarily funded by grants and The George Washington (GW) University Cancer Center. Immutep will provide efti at no cost, technical support, and limited funding that falls within its existing budget. The trial will be led by Principal Investigator, Pavani Chalasani, MD, MPH, Division Director of Hematology and Medical Oncology at the GW Cancer Center and a leader of the GW Cancer Center Breast Cancer clinical research team.

**Dr. Chalasani stated**, "Given my clinical experience with efti in the AIPAC-003 study coupled with promising data from additional trials evaluating efti in metastatic breast cancer settings, we look forward to evaluating this unique immunotherapy at earlier stage disease in patients with HR+/HER2 -ve breast cancer. As a novel neoadjuvant immunotherapy option, efti's powerful and safe activation of a broad anti-cancer immune response in combination with chemotherapy may lead to high rates of pathologic complete responses, the primary endpoint of this study. Additionally, we are hopeful that efti's immune activation in these patients with early stage cancer who have stronger immune systems may lead to improved disease free survival."

Efti's targeting and unique activation of powerful antigen-presenting cells via MHC Class II leads to a broad anti-cancer immune response. This includes the activation and proliferation of cytotoxic CD8+ T cells that can be armed *in vivo* with chemotherapy-induced tumour antigens, as well as numerous other immune cells and cytokines enhancing the immune system's ability to fight cancer. This novel immunotherapy has yielded encouraging clinical results in metastatic disease and earlier stage disease in its initial trial as a neoadjuvant treatment in soft tissue sarcoma.

**Immutep CEO, Marc Voigt added**, "We are thankful for the interest and investment by academia in the United States and elsewhere to evaluate the promise of efti at earlier-stage disease. This trial helps us cost-efficiently expand our clinical pipeline for neoadjuvant efti in areas of high unmet need. Our belief is this novel immune system activator can play a meaningful role in metastatic settings and in the ongoing expansion of immunotherapy into neoadjuvant settings to fight cancer."

![LOGO](g76406snap6.jpg)

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The goal of this multi-center study led by the GW Cancer Center is to determine pathological complete response (pCR) after neoadjuvant efti treatment and neoadjuvant chemotherapy (NAC). This is a single-arm interventional trial in patients with early-stage HR+/HER2 -ve breast cancer (Stage I-III) who are eligible for NAC. Enrolled patients will be treated with efti monotherapy for three weeks and then start NAC in combination with efti. For more information, visit clinicaltrials.gov (<u>NCT07102940</u>).

**About Eftilagimod Alfa (efti)** 

Efti is Immutep's proprietary soluble LAG-3 protein and MHC Class II agonist that stimulates both innate and adaptive immunity for the treatment of cancer. As a first-in-class antigen presenting cell (APC) activator, efti binds to MHC (major histocompatibility complex) Class II molecules on APC leading to activation and proliferation of CD8+ cytotoxic T cells, CD4+ helper T cells, dendritic cells, NK cells, and monocytes. It also upregulates the expression of key biological molecules like IFN-g and CXCL10 that further boost the immune system's ability to fight cancer.

Efti is under evaluation for a variety of solid tumours including non-small cell lung cancer (NSCLC), head and neck squamous cell carcinoma (HNSCC), and metastatic breast cancer. Its favourable safety profile enables various combinations, including with anti-PD-[L]1 immunotherapy 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 <u>www.immutep.com</u>.

**Australian Investors/Media:** 

Eleanor Pearson, Sodali & Co.

+61 2 9066 4071; <u>eleanor.pearson@sodali.com</u>

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

Chris Basta, VP, Investor Relations and Corporate Communications

+1 (631) 318 4000; <u>chris.basta@immutep.com</u>

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

![LOGO](g76406snap6.jpg)