Greenwich LifeSciences Announces European Approval for Use of Commercially Manufactured GP2 in FLAMINGO-01

About this update from Greenwich Lifesciences, Inc.

STAFFORD, Texas, July 09, 2026 (GLOBE NEWSWIRE) -- Greenwich LifeSciences, Inc. (Nasdaq: GLSI) (the "Company"), 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, today provided the following update on the use of commercially manufactured GP2 in FLAMINGO-01 in Europe. All European and US Sites to Treat Patients with Commercially Manufactured GP2 The Company previously announced that the first three commercial lots of GP2 active ingredient were manufactured in 2023 in an approved commercial facility, which could be used to prepare approximately 200,000 doses of GP2. In 2024, the first commercial lot filling GP2 into vials for commercial sale or for clinical use was manufactured in a commercial facility. In addition, drug stability programs were initiated for all four lots. Data on these commercial lots was submitted to the FDA, and after review, the first commercial lot of GP2 vials was approved for use in FLAMINGO-01 in the US in early 2026. All approximately 40-50 US sites have been supplied with commercially manufactured GP2 vials and have begun treating patients with these vials. We were able to efficiently distribute the GP2 vials and communicate with the US pharmacists working with our warehouse partners and through our clinical team, which we internalized in Q4 2025. The European Medicines Agency (EMA) has completed their review and will also allow use of the same commercially manufactured GP2 lot in FLAMINGO-01 in Europe. Thus, all clinical sites in the US and Europe, which have increased from 160 sites to approximately 170-180 sites, are expected to be using the same lot with shipments to European pharmacies already under way. We are now seeking approval to use this lot in the UK and Canada in separate and independent regulatory processes. About FLAMINGO-01 Open Label Phase III Data More than 1,300 patients have been screened with a current screen rate of approximately 800 patients per year. The 250 patient non-HLA-A*02 arm is now fully enrolled, where all patients received GLSI-100, which is 5 times more treated patients and recurrence rate data than the approximately 50 patients treated in the Phase IIb trial. The Primary Immunization Series (PIS), which includes the first 6 GLSI-100 injections over the first 6 month...

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