Greenwich LifeSciences provides global update on FLAMINGO-01

Greenwich LifeSciences (GLSI), a clinical-stage biopharmaceutical company focused on its Phase III clinical trial, FLAMINGO-01, which is evaluating GLSI-100, an immunotherapy to prevent breast cancer recurrences, provided the following global update on FLAMINGO-01. Flamingo-01 Progress to Date & Future Plans: The Company recently confirmed that the preliminary HLA prevalence, safety, and immune response data in FLAMINGO-01 patients is trending as expected in both HLA-A*02 and non-HLA-A*02 arms. The non-HLA-A*02 arm was expanded to 250 patients in 2024 with approval from both EU and US regulators. With the new preliminary positive immune response data in these patients, further changes are being considered, including the potential to transform the non-HLA-A*02 open label third arm into effectively a second Phase III trial which could lead to multiple pathways for marketing approval of GLSI-100 and a larger market potential. In Q1 2025, the Company achieved its highest screening rate of over 150 patients per quarter or the equivalent of 600 patients per year in 40 US sites and 77 EU sites for a total of 117 active sites. In addition, 30 sites in the EU are planned to be activated in 2025 with the potential for another 10 sites to be approved and added in additional EU countries, bringing the total potential sites to over 150 sites globally. Once these sites are activated, the Company is considering a strategy to continue enrolling in both of the HLA-A*02 and non-HLA-A*02 arms until an interim analysis is conducted and the appropriate size of each arm can be further assessed.