Maria Sklodowska-Curie National Research Institute of Oncology

Media Release Novel triple combination of efti with radiotherapy and anti-PD-1 therapy is well tolerated and has led to encouraging initial efficacy data in EFTISARC-NEO Phase II trialFour of six patients treated have very good, near-complete pathologic responses (primary endpoint of study) that are rarely observed with standard therapiesSoft tissue sarcoma is a hard-to-treat orphan disease with poor prognosis & high unmet medical needAdditional data from EFTISARC-NEO planned for a medical conference in H2 CY2024 SYDNEY, AUSTRALIA, May 02, 2024 (GLOBE NEWSWIRE) -- Immutep Limited (ASX: IMM; NASDAQ: IMMP) ("Immutep” or “the Company”), a clinical-stage biotechnology company developing novel LAG-3 immunotherapies for cancer and autoimmune disease, today announces initial encouraging data from EFTISARC-NEO, a Phase II investigator-initiated trial of eftilagimod alpha (efti) in combination with radiotherapy, a standard-of-care treatment, plus KEYTRUDA® (pembrolizumab) for patients with soft tissue sarcoma (STS). The EFTISARC-NEO study is the first to evaluate efti in a neoadjuvant setting, which takes place before intended surgery, and the first to combine efti with radiotherapy. Importantly, the neoadjuvant setting allows for the impact of this novel combination to be assessed in the tumour microenvironment (TME). The triple combination has revealed no new safety findings and has been well tolerated in the first six patients who have completed the 10 weeks of treatment followed by surgery 2-3 weeks later. Initial efficacy data is very encouraging with 4 of 6 patients (67%) having near-complete responses according to EORTC-STBSDG, which measures responses via tissue pathology after surgery. These deep responses are rarely seen in STS patients with standard therapeutic approaches including radiotherapy. Katarzyna Kozak, M.D., Ph.D., and Paweł Sobczuk, M.D., Ph.D., medical oncologists at the Department of Soft Tissue/Bone Sarcoma and Melanoma at MSCNRIO (Warsaw), and the trial’s principal investigators stated: “The initial pathologic responses from this novel combination are very encouraging and supportive of the potential synergistic effects of this new therapeutic approach. Indeed we have seen a high degree of hyalinization/fibrosis in the surgical samples which we rarely see with standard treatments. We look forward to continuing this study.” Frédéric Triebel, M.D., Ph.D, Immutep’s Chief Scientific Officer, added: “We are pleased to see these early results from EFTISARC-NEO, which has allowed efti for the first time to be clinically evaluated in a non-metastatic cancer setting. The ability to evaluate tumour specimens is helping elucidate the significant anti-cancer immune response efti drives through its direct maturation and activation of antigen-presenting cells as an MHC Class II agonist. If the positive trend of strong pathological responses continues in this rare orphan disease, we will pursue all available avenues to bring this innovative therapy to soft tissue sarcoma patients in need of new, effective therapies in an expeditious manner.” Efti’s targeting and unique activation of dendritic cells, the most potent professional antigen-presenting cells, as a MHC Class II agonist leads to broad adaptive and innate immunity to fight cancer, including proliferation of CD8+ cytotoxic T cells that can be armed with radiotherapy-induced tumour antigens. The combination of efti with radiotherapy and anti-PD-1 therapy has the potential to generate a robust anti-tumour immune response in the immunosuppressed tumour microenvironment of soft tissue sarcoma. The open-label EFTISARC-NEO Phase II study will treat up to 40 patients and is being conducted by the Maria Skłodowska-Curie National Research Institute of Oncology (MSCNRIO) in Warsaw. The trial is primarily funded with an approved grant from the Polish government awarded by the Polish Medical Research Agency program. The study’s primary endpoint is the pathologic response rate (defined as percentage of tumor hyalinization/fibrosis) to the treatment assessed at the time of surgical resection. The lower the number of viable tumor cells and the higher the extent of hyalinization/fibrosis observed in patients’ tumor specimens will determine the therapy’s effectiveness. For more information, visit clinicaltrials.gov (NCT06128863). The trial is ongoing with 14 patients now enrolled and additional clinical data is planned to be presented at a medical conference in H2 CY2024. About Soft Tissue Sarcoma Soft tissue sarcoma (STS), an orphan disease, represents a high unmet medical need with a poor prognosis. The incidence of STS varies in different regions, with approximately 23,400 cases annually and a crude incidence of 4.7 per 100,000 in Europe, according to the RARECARE project. In the United States, the number of new cases is estimated to be 13,400 annually with 5,140 deaths, according to the American Cancer Society. About The Maria Skłodowska-Curie National Research Institute of OncologyThe Maria Skłodowska Curie National Research Institute of Oncology is the leading Polish comprehensive cancer centre, as well as the primary government research institution devoted solely to oncology. Founded in 1932 by Maria Sklodowska-Curie, it is currently divided into 28 specialised clinical departments responsible for the diagnostics and therapy of different tumour types such as: Breast Cancer Clinic, Head and Neck Cancer Clinic, General and Visceral Surgery, Thoracic Surgery, Urology, Gynaecology, Haematology, Soft Tissue/Bone Sarcoma and Melanoma Clinic, Radiation Oncology, Brachytherapy and Diagnostic Radiology, Pathology and Molecular Medicine and Cell Research, Oncology, Gastroenterology, Cancer Epidemiology and Prevention Division and others. About ImmutepImmutep is a clinical-stage biotechnology company developing novel LAG-3 immunotherapy for cancer and autoimmune disease. We are pioneers in the understanding and advancement of therapeutics related to Lymphocyte Activation Gene-3 (LAG-3), and our diversified product portfolio harnesses its unique 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. Australian Investors/Media:Catherine Strong, Morrow Sodali+61 (0)406 759 268; c.strong@morrowsodali.com U.S. Investors/Media:Chris Basta, VP, Investor Relations and Corporate Communications+1 (631) 318 4000; chris.basta@immutep.com

Media Release SYDNEY, AUSTRALIA, July 28, 2023 (GLOBE NEWSWIRE) -- Immutep Limited (ASX: IMM; NASDAQ: IMMP) ("Immutep” or “the Company”), a clinical-stage biotechnology company developing novel LAG-3 immunotherapies for cancer and autoimmune disease, today announces the first patient has been enrolled and safely dosed in EFTISARC-NEO, the Phase II investigator-initiated trial of eftilagimod alpha (efti), a soluble LAG-3 protein and MHC Class II agonist, in combination with radiotherapy and the anti-PD-1 therapy KEYTRUDA® (pembrolizumab) for patients with soft tissue sarcoma. This chemo-free trial is the first to evaluate efti in a neoadjuvant setting. Soft tissue sarcoma (STS), an orphan disease, represents a high unmet medical need with a poor prognosis. The incidence of STS varies in different regions, with approximately 23,400 cases annually and a crude incidence of 4.7 per 100,000 in Europe, according to the RARECARE project. In the United States, the number of new cases is estimated to be 13,400 annually with 5,140 deaths, according to the American Cancer Society. The open-label EFTISARC-NEO Phase II study, which will treat up to 40 patients, is being conducted by the Maria Skłodowska-Curie National Research Institute of Oncology (MSCNRIO) and is primarily funded with an approved grant from the Polish government awarded by the Polish Medical Research Agency program. The trial’s Principal Investigators are Dr. Katarzyna Kozak, M.D., Ph.D., and Paweł Sobczuk, M.D., Ph.D., medical oncologists at the Department of Soft Tissue/Bone Sarcoma and Melanoma at MSCNRIO. Dr. Paweł Sobczuk stated: “Soft tissue sarcoma is a rare, aggressive disease in high need of new therapeutic approaches, and we are pleased to begin treating patients with this novel IO-IO-radiotherapy combination and look forward to evaluating the potential synergistic effects of this chemo-free therapy. In particular, efti's sustained activation of antigen-presenting cells, leading to proliferation of activated CD8+ T cells and elevated interferon-gamma levels, may transform the immunosuppressed tumour microenvironment of soft tissue sarcomas into one that enables immune checkpoint inhibitors like pembrolizumab to exert their anti-cancer effect. Additionally, we see synergies between efti and radiotherapy to arm, activate, and proliferate cytotoxic T cells with radiotherapy-induced cancer antigens to target this difficult-to-treat tumour." Immutep CSO, Frédéric Triebel, M.D., Ph.D, said: “We are pleased to see this trial, led by the expert team at the Maria Skłodowska-Curie National Research Institute, begin to enrol and dose patients. EFTISARC-NEO represents the first time efti will be evaluated in the neoadjuvant, non-metastatic cancer setting where patients will receive efti much earlier on in their cancer journey. Also, the neoadjuvant setting gives us the opportunity to assess in the surgical specimen the changes in the tumour microenvironment induced by efti. New information arising from this innovative trial may further broaden the future clinical development of efti and, in the end, bring even greater benefit to patients.” About Eftilagimod Alpha (Efti)Efti is Immutep’s proprietary soluble LAG-3 clinical stage candidate that is a first-in-class antigen presenting cell (APC) activator that stimulates both innate and adaptive immunity for the treatment of cancer. Efti binds to MHC II molecules on APCs leading to activation/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-ƴ 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 1st line HNSCC and in 1st line NSCLC from the United States Food and Drug Administration (FDA). About The Maria Skłodowska-Curie National Research Institute of OncologyThe Maria Skłodowska Curie National Research Institute of Oncology is the leading Polish comprehensive cancer centre, as well as the primary government research institution devoted solely to oncology. Founded in 1932 by Maria Sklodowska-Curie, it is currently divided into 28 specialised clinical departments responsible for the diagnostics and therapy of different tumour types such as: Breast Cancer Clinic, Head and Neck Cancer Clinic, General and Visceral Surgery, Thoracic Surgery, Urology, Gynaecology, Haematology, Soft Tissue/Bone Sarcoma and Melanoma Clinic, Radiation Oncology, Brachytherapy and Diagnostic Radiology, Pathology and Molecular Medicine and Cell Research, Oncology, Gastroenterology, Cancer Epidemiology and Prevention Division and others. About ImmutepImmutep is a clinical stage biotechnology company developing novel LAG-3 immunotherapy for cancer and autoimmune disease. We are pioneers in the understanding and advancement of therapeutics related to Lymphocyte Activation Gene-3 (LAG-3), and our diversified product portfolio harnesses its unique 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. Australian Investors/Media:Catherine Strong, Citadel-MAGNUS+61 (0)406 759 268; cstrong@citadelmagnus.com U.S. Media:Chris Basta, VP, Investor Relations and Corporate Communications+1 (631) 318 4000; chris.basta@immutep.com

Media Release Second US FDA Fast Track designation granted to eftilagimod alpha (efti) supporting planned late-stage development in 1st line non-small cell lung cancer (1L NSCLC)Compelling Phase II results in 1L NSCLC, including Overall Response Rate (ORR) of 40.4% in all-comer PD-L1 TACTI (Two ACTive Immunotherapies trial)-002 trial combining efti and pembrolizumab, showcased at SITC 2022 press briefingSuccessful meeting with FDA for efti in metastatic breast cancer (MBC) and agreement for integrated Phase II/III trial design with expanded patient population to include triple-negative breast cancerPositive Independent Data Monitoring Committee (IDMC) recommendation for the TACTI-003 Phase IIb trial in 1st line head and neck squamous cell carcinoma (1L HNSCC) to continue as plannedPromising initial clinical data from triple combination therapy in INSIGHT-003 Phase I trial presented at SITC 2022 conferenceSecond agreement signed with Merck KGaA, Darmstadt, Germany and Pfizer for a new, jointly funded Phase I clinical study in patients with urothelial cancerAchieved commercial scale in efti manufacturing and established a GMP-compliant manufacturing process for IMP761Strong cash position of $68.38 million, with cash runway extended to the end of FY24 SYDNEY, AUSTRALIA, Jan. 30, 2023 (GLOBE NEWSWIRE) -- Immutep Limited (ASX: IMM; NASDAQ: IMMP) ("Immutep” or “the Company”), a biotechnology company developing novel LAG-3 related immunotherapy treatments for cancer and autoimmune diseases, provides an update on the ongoing development of its product candidates, efti and IMP761, for the quarter ended 31 December 2022 (Q2 Fiscal Year 2023). EFTI DEVELOPMENT PROGRAM FOR CANCER Planned late-stage trial in 1L NSCLC The United States Food and Drug Administration (US FDA) granted Fast Track designation to efti in combination with pembrolizumab in October 2022 for the treatment of 1L NSCLC, which will be evaluated in the Company’s planned late-stage registrational trial. The designation was granted based on the encouraging Phase II clinical data in 1L NSCLC from the TACTI-002 all-comer trial in terms of PD-L1 status, presented at American Society of Clinical Oncology’s (ASCO) Annual Meeting in June 2022. It is the second Fast Track designation issued by the FDA for efti (the first is for 1L HNSCC) and offers the potential for expedited development and review. TACTI-002 (also designated KEYNOTE-PN798) Phase II clinical trialImmutep reported compelling new clinical data from the TACTI-002 trial evaluating efti in combination with MSD’s (Merck & Co., Inc., Rahway, NJ., USA) anti-PD-1 therapy KEYTRUDA® (pembrolizumab) in 1L NSCLC via a late-breaking abstract oral presentation at the Society of Immunotherapy of Cancer (SITC) Meeting in November 2022. Immutep’s abstract was one of just nine to be showcased at the SITC 2022 press briefing, out of more than 1,500 abstract submissions. The results showed an ORR of 40.4% in the all-comer PD-L1 trial, meeting the primary endpoint of the 1L NSCLC part of the trial. The ORR improved across all PD-L1 status groups by central assessment compared with data reported at ASC0 2022. Additionally, the interim median Duration of Response (DoR) of 21.6 months, compares favourably to historical controls. Promising results were also achieved in the secondary endpoint of interim median Progression Free Survival (PFS) with overall PFS of 6.6 months and 9.3 months in patients with a PD-L1 TPS (Tumour Proportion Score) >1% for which efti in combination with pembrolizumab has Fast Track designation. TACTI-003 – Phase IIb clinical trialIn October 2022, the IDMC for Immutep’s Phase IIb TACTI-003 trial reviewed the initial safety data from the study and recommended the trial continue with no modifications. The IDMC also reviewed initial efficacy data, although this was not the primary focus of the analysis. The recommendation validates Immutep’s decision to evaluate efti in the 1st line HNSCC setting following an encouraging ORR of 29.7% regardless of PD-L1 expression and five complete responses (CR) reported in the 2nd line HNSCC setting in TACTI-002. The Company also presented a Trial in Progress poster on the TACTI-003 study at the SITC 2022 meeting in November 2022. Recruitment is ongoing for the TACTI-003 trial, with more than 50% of the planned 154 patients enrolled till quarter end. Planned Phase II/III trial in Metastatic Breast Cancer Immutep reported the positive outcome of its follow-up Type C meeting with the US FDA regarding its late-stage clinical development plans for efti in conjunction with standard-of-care chemotherapy for the treatment of MBC in December 2022. The Company and the FDA have agreed to an integrated Phase II/III trial design to help inform a Biologics License Application (BLA). Based on the encouraging efficacy, favourable safety and learnings from the randomised AIPAC Phase IIb trial (which administered efti and chemotherapy on different days and ceased chemotherapy at six months), patients will receive efti and paclitaxel on the same day and treatment will continue until disease progression. In addition to HER2–/HR+ metastatic breast cancer, the patient population has also been expanded to include triple-negative breast cancer (TNBC), an aggressive form of breast cancer with limited treatment options. Subject to regulatory and ethics committee feedback, the Phase II portion of the trial is expected to begin in Q3 FY23 with a safety lead in of 6 to 12 patients who will be given a higher 90mg dose of efti (compared to the completed AIPAC trial). This will be followed by 58 patients for the randomised Phase II portion of the trial. Depending on the Phase II results and Immutep’s resources, the Phase III portion will commence. Phase II trial in Soft Tissue SarcomaTrial preparations continued during the quarter for a new investigator-initiated Phase II clinical trial which was announced in September 2022. The trial will be conducted in collaboration with the Maria Skłodowska-Curie National Research Institute in Poland and will evaluate efti in combination with pembrolizumab and radiotherapy, prior to surgery, in up to 40 patients with select soft tissue sarcoma. The trial is expected to commence in H1 of calendar year 2023. INSIGHT-003 – Phase I triple combination with standard-of-care anti-PD-1 therapy and chemotherapyInitial clinical data was reported from the investigator-initiated INSIGHT-003 trial in November at the SITC 2022 conference. The poster provided initial efficacy details on 11 of the 14 patients with metastatic NSCLC adenocarcinomas that had been enrolled as of the 14 October 2022 cut-off date, plus safety data on all 14 patients. The data shows the triple-combination approach is well-tolerated and provides promising early signals of therapeutic activity with an ORR of 72.7% (8/11) and a Disease Control Rate (DCR) of 90.9% (10/11). INSIGHT-005 – New Phase I trial with Merck KGaA, Darmstadt, Germany, and PfizerImmutep signed a Clinical Trial Collaboration and Supply Agreement with Merck KGaA, Darmstadt, Germany and Pfizer in November 2022 for a new Phase I clinical study in patients with urothelial cancer, called INSIGHT-005. It is the second agreement entered into by Immutep with Merck KGaA and Pfizer and builds on the encouraging clinical data reported from the completed INSIGHT-004 study in multiple solid tumour indications from efti and avelumab (BAVENCIO®). Under the Agreement, Immutep and Merck KGaA will jointly fund the study, which is expected to start in mid-calendar year 2023. Efti Manufacturing Scale-Up Immutep successfully scaled-up the manufacturing process for efti with the completion of its first 2,000L manufacturing run by the Company’s manufacturing partner, WuXi Biologics. This large-scale manufacturing capability is a significant achievement. Immutep plans to introduce the material manufactured into ongoing and future Phase II/III clinical trials. IMP761 DEVELOPMENT PROGRAM FOR AUTOIMMUNE DISEASESDuring the quarter, Immutep established a GMP-compliant manufacturing process for IMP761, its proprietary preclinical candidate for autoimmune diseases. The 200L scale manufacturing process was developed by the Company’s manufacturing partner, Northway Biotech and will provide supply of IMP761 for Investigational New Drug (IND)-enabling studies and clinical trials. INTELLECTUAL PROPERTYImmutep was granted four new patents during the quarter. The first two patents were filed as divisional applications and were granted by the Japanese and South Korean Patent Offices. These patents protect Immutep’s intellectual property relating to combination preparations comprising efti and a chemotherapy agent which is oxaliplatin, carboplatin, or topotecan. They follow the grant of the Japanese parent patent and corresponding patents in the United States, Europe, China and Australia, as announced in 2019 through 2021. The Company was granted another patent by the South Korean Patent Office, which relates to a potency assay for release testing of efti. The assay is used in Immutep’s commercial-scale (2,000L) manufacturing process. Immutep was also granted a new patent by the Chinese Patent Office. The patent protects IMP731 in the territory of mainland China. The patent is co-owned with the French Institute of Health and Medical Research (INSERM) and exclusively licensed to GSK, Immutep’s development partner for IMP731. FINANCIAL SUMMARYImmutep’s financial performance over the quarter (Q2 FY23) continues to reflect prudent cash management. The Company’s cash runway was expanded to the end of FY24 (previously early H2 FY24). Cash receipts from customers Q2 FY23 were $8k, compared to $33k in Q1 FY23. The Company received a A$986,286 cash rebate from the Australian Federal Government’s R&D tax incentive program in relation to expenditure incurred on eligible R&D activities conducted in Australia in the 2021 fiscal year. The net cash used in G&A activities in the quarter was $734k compared to $595k in Q1 FY23. Payments to Related Parties, for the quarter includes $402k in payment of Non-Executive Director’s fees and Executive Director’s remuneration. The net cash used in R&D activities in the quarter was $5.87 million, compared to $7.17 million in Q1 FY23. The decrease was mainly due to a reduction in manufacturing activities during the quarter. Total net cash outflows used in operating activities in the quarter were $7.02 million compared to $6.35 million in Q1 FY23. Immutep’s cash and cash equivalent balance at 31 December 2022 was approximately $68.38 million, giving the Company an expected cash reach based on current estimates to the end of FY24. Immutep will continue to manage its strong cash balance carefully as it pursues its overall clinical development strategy. About ImmutepImmutep is a globally active biotechnology company that is a leader in the development of LAG-3 related immunotherapeutic products for the treatment of cancer and autoimmune disease. Immutep is dedicated to leveraging its technology and expertise to bring innovative treatment options to market for patients and to maximize value to shareholders. Immutep is listed on the Australian Securities Exchange (IMM), and on the NASDAQ (IMMP) in the United States. Immutep’s current lead product candidate is eftilagimod alpha (“efti” or “IMP321”), a soluble LAG-3 fusion protein (LAG-3Ig), which is a first-in-class antigen presenting cell (APC) activator being explored in cancer and infectious disease. Immutep is also developing an agonist of LAG-3 (IMP761) for autoimmune disease. Additional LAG-3 products, including antibodies for immune response modulation, are being developed by Immutep’s large pharmaceutical partners. Further information can be found on the Company’s website www.immutep.com or by contacting: Australian Investors/Media:Catherine Strong, Citadel-MAGNUS+61 (0)406 759 268; cstrong@citadelmagnus.com U.S. Media:Tim McCarthy, LifeSci Advisors+1 (212) 915.2564; tim@lifesciadvisors.com