Core Insights - Immutep Limited is set to present new data from the AIPAC-003 trial at the 2025 San Antonio Breast Cancer Symposium, highlighting its late-stage immunotherapy targeting cancer and autoimmune diseases [1] Study Overview - The Phase II AIPAC-003 trial involved 66 female participants with HR+ and HER2-negative/HER2-low metastatic breast cancer resistant to endocrine therapy or metastatic triple-negative breast cancer not eligible for PD-(L)1 therapy [2] - Participants were randomized to receive either 30 mg or 90 mg of eftilagimod alfa in combination with paclitaxel to determine the optimal biological dose [2] Efficacy Results - The study reported strong objective response rates (ORR) of 41.9% for the 30 mg dose and 48.5% for the 90 mg dose, with disease control rates (DCR) of 87.1% and 78.8%, respectively [3] - Time to onset of response was similar at 2.0 months for the 30 mg dose and 1.9 months for the 90 mg dose [3] Pharmacodynamic Response - Both dosing levels showed significant increases in immune activation biomarkers, including absolute-lymphocyte count and interferon-gamma, aligning with the mechanism of action of eftilagimod alfa [4] Clinical Implications - The study's findings support the selection of 30 mg as the optimal biological dose, which is crucial for meeting FDA's Project Optimus requirements and advancing Immutep's oncology pipeline [6] - The ongoing Phase III TACTI-004 trial will evaluate eftilagimod alfa in combination with KEYTRUDA and chemotherapy for advanced or metastatic non-small cell lung cancer [6] Presentation Details - The presentation at SABCS 2025 will be led by Dr. Nuhad Ibrahim and will focus on the optimal biological dose of eftilagimod alfa in metastatic breast cancer patients [7][8]