Core Insights - Actinium Pharmaceuticals, Inc. announced the acceptance of preclinical data for its ATNM-400 program in non-small cell lung cancer (NSCLC) for presentation at the AACR-NCI-EORTC conference in October 2025, highlighting its innovative approach in targeted radiotherapies [1][5] Summary by Sections ATNM-400 in NSCLC - NSCLC accounts for about 85% of lung cancer cases and is the leading cause of cancer mortality globally [2] - EGFR tyrosine kinase inhibitors (TKIs) like osimertinib have improved outcomes for patients, but resistance develops in nearly all patients within 2 to 3 years, leading to disease progression [2] Preclinical Data - Preclinical data indicates that ATNM-400 shows strong anti-tumor activity in EGFR-mutant NSCLC models and can overcome resistance to osimertinib, demonstrating potential as a combination therapy [3][8] - The data suggests ATNM-400 could address a significant unmet need in oncology for patients with relapsed or refractory EGFR-mutant NSCLC [3] Clinical Trial Insights - A Phase 2 trial reported a median progression-free survival (PFS) of 32.3 months for patients receiving osimertinib plus consolidative radiotherapy, a notable improvement over the 20.0-month PFS with osimertinib alone [4] Multi-Indication Potential - Initially developed for prostate cancer, ATNM-400 targets a distinct receptor involved in tumor progression and treatment resistance, maintaining efficacy in PSMA-low or PSMA-resistant cases [6][10] - In preclinical models, ATNM-400 has shown synergy with enzalutamide, leading to significant tumor control and improved overall survival [6][10] Mechanism of Action - ATNM-400 utilizes Actinium-225 to induce irreparable double-strand DNA breaks, which is expected to overcome conventional resistance pathways and provide durable tumor control [7][10] Market Context - Prostate cancer is the most commonly diagnosed cancer in men, with approximately 1.5 million new cases globally and over 313,000 expected in the U.S. in 2025 [11] - Lung cancer, particularly NSCLC, is projected to have over 200,000 new cases in the U.S. in 2025, emphasizing the significant market potential for ATNM-400 [11] Company Overview - Actinium Pharmaceuticals is focused on developing targeted radiotherapies to improve patient outcomes, with ATNM-400 being a key candidate for both prostate cancer and NSCLC [12]

Core Insights - Actinium Pharmaceuticals, Inc. announced compelling preclinical data for ATNM-400, a first-in-class antibody radioconjugate targeting a non-PSMA antigen associated with prostate cancer progression, demonstrating potent therapeutic activity independent of PSMA expression levels [1][4][5] Group 1: Product Overview - ATNM-400 utilizes Actinium-225 (Ac-225) as a potent alpha-emitter, showing superior efficacy compared to existing therapies like enzalutamide and 177Lu-PSMA-617 [1][4] - The product is designed to maintain efficacy in PSMA-low or PSMA-resistant prostate cancer, addressing a significant unmet clinical need [5][8] - Preclinical models indicate that ATNM-400 can overcome resistance to enzalutamide and enhance overall survival when used in combination with ARPI therapies [4][6] Group 2: Market Context - Prostate cancer is the most diagnosed cancer in men, with approximately 1.5 million new cases globally and over 313,000 expected in the U.S. in 2025 [7] - Up to 20% of prostate cancer cases progress to metastatic castration-resistant prostate cancer (mCRPC), a stage with limited treatment options [7] - The ARPI class, including enzalutamide, generated over $10 billion in sales in 2024, highlighting the significant market potential for new therapies like ATNM-400 [7] Group 3: Future Developments - Actinium plans to present ATNM-400 at the 32nd Annual Prostate Cancer Foundation Scientific Retreat on October 23-25, 2025 [2] - The company aims to evaluate ATNM-400 in other solid tumor indications beyond prostate cancer, indicating a broader application of the technology [7][8]