Phase 3 VIKTORIA-1 HR+/HER2-/PIK3CA WT Trial Results Gedatolisib is an investigational agent and is not approved by any regulatory agency as a treatment for any indication. October 20, 2025 Forward-Looking Statements This presentation contains statements that constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These statements relate to Celcuity's business, operations, and financial condition, and include but are not limited to our current beli ...

Core Insights - Celcuity Inc. announced significant efficacy and safety results from the Phase 3 VIKTORIA-1 clinical trial of gedatolisib for advanced breast cancer, showing a 76% reduction in disease progression risk with the triplet therapy compared to fulvestrant [1][3][6] Efficacy Results - The gedatolisib triplet therapy achieved a median progression-free survival (PFS) of 9.3 months, an improvement of 7.3 months over fulvestrant, with a hazard ratio (HR) of 0.24 [3][6] - The objective response rate (ORR) for the triplet was 31.5%, while the doublet showed an ORR of 28.3% [3][6] - For the gedatolisib doublet, the median PFS was 7.4 months, an improvement of 5.4 months over fulvestrant, with a HR of 0.33 [3][6] Safety Profile - Hyperglycemia occurred in 9.2% of patients on the triplet and 11.5% on the doublet, with treatment discontinuation due to adverse events at 2.3% and 3.1%, respectively [5][7] - The most common grade 3 treatment-related adverse events included neutropenia (52.3% for triplet), stomatitis (19.2% for triplet), and hyperglycemia (2.3% for triplet) [7] Clinical Significance - The results from the VIKTORIA-1 trial represent a potential new standard of care for patients with HR+/HER2- advanced breast cancer who have progressed after CDK4/6 inhibitor treatment [7][9] - Gedatolisib is the first inhibitor targeting the PI3K/AKT/mTOR pathway to show positive Phase 3 results in this patient population [6][9] Future Developments - Celcuity has initiated a rolling New Drug Application (NDA) submission to the FDA, targeting completion in Q4 2025 [9] - The PIK3CA mutant cohort of the VIKTORIA-1 trial is fully enrolled, with topline data expected in late Q1 or Q2 2026 [9]