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]