GLSI Greenwich LifeSciences Inc

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 announced the activation of clinical sites in Poland.

According to the latest data collected by the European Cancer Information System (click here), a total of 24,599 new cases of breast cancer were diagnosed in Poland in 2022, which is the most common cancer diagnosed in women, representing approximately 25% of all cancers in women. Breast cancer is the second leading cause of death from cancer in women in Poland with 8,723 deaths in 2022.

The Company is collaborating with Dr. Piotr Wysocki, who is leading one of the largest academic and private breast cancer research networks in Poland, where 9 to 11 sites have agreed to participate in FLAMINGO-01. These sites were approved by Polish authorities, which has led to site initiation visits and the treatment of the first patient in Poland in 2024.

Dr. Wysocki is Professor of Medicine and Head of Department of Oncology at Jagiellonian University Hospital in Krakow Poland. He has research interests in the development of novel apheresis-based cancer therapies, clinical application of metronomic chemotherapy, metronomic chemo-endocrine and chemo-targeted therapies for the treatment of breast, prostate, and ovarian cancers.

CEO Snehal Patel commented, "Poland has a reputation for large treatment centers with high enrollment and standard of care. We look forward to working with Dr. Wysocki who is serving as the national principal investigator for Poland in FLAMINGO-01. We have been impressed with the sites that we have visited to date. In addition, we may have an opportunity to offer our study to Ukrainians who may have been displaced and now reside in Poland."

The Polish clinical sites will be listed here with an interactive map and are shown below.

KoninKOMED Oncology Center

Kraków (2)Samodzielny Publiczny Zakład Opieki Zdrowotnej (ZOZ) Szpital Uniwersytecki w KrakowieSzpital Specjalistyczny im. Ludwika Rydygiera w Krakowie

OpoleSamodzielny Publiczny Zakład Opieki Zdrowotnej (SPOZOZ) Opolskie Centrum Onkologii im. prof. Tadeusza Koszarowskiego w Opolu

PoznańUniwersytecki Szpital Kliniczny w Poznaniu

RzeszówCentrum Medyczne MrukMed

SlupskWojewodzki Szpital Specjalistyczny im. Janusza Korczaka w Slupsku Sp. z o.o.

Warszawa (2)Wojskowy Instytut Medyczny,Państwowy Instytut BadawczyNarodowy Instytut Onkologii im. Marii Skłodowskiej-Curie

About FLAMINGO-01 and GLSI-100

FLAMINGO-01 (NCT05232916) is a Phase III clinical trial designed to evaluate the safety and efficacy of GLSI-100 (GP2 + GM-CSF) in HER2 positive breast cancer patients who had residual disease or high-risk pathologic complete response at surgery and who have completed both neoadjuvant and postoperative adjuvant trastuzumab based treatment. The trial is led by Baylor College of Medicine and currently includes US clinical sites from university-based hospitals and cooperative networks with plans to expand into Europe and to open up to 150 sites globally. In the double-blinded arms of the Phase III trial, approximately 500 HLA-A*02 patients will be randomized to GLSI-100 or placebo, and up to 250 patients of other HLA types will be treated with GLSI-100 in a third arm. The trial has been designed to detect a hazard ratio of 0.3 in invasive breast cancer-free survival, where 28 events will be required. An interim analysis for superiority and futility will be conducted when at least half of those events, 14, have occurred. This sample size provides 80% power if the annual rate of events in placebo-treated subjects is 2.4% or greater.

For more information on FLAMINGO-01, please visit the Company's website here and clinicaltrials.gov here. Contact information and an interactive map of the majority of participating clinical sites can be viewed under the "Contacts and Locations" section. Please note that the interactive map is not viewable on mobile screens. Related questions and participation interest can be emailed to: flamingo-01@greenwichlifesciences.com

About Breast Cancer and HER2/neu Positivity

One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 300,000 new breast cancer patients and 4 million breast cancer survivors. HER2 (human epidermal growth factor receptor 2) protein is a cell surface receptor protein that is expressed in a variety of common cancers, including in 75% of breast cancers at low (1+), intermediate (2+), and high (3+ or over-expressor) levels.

About Greenwich LifeSciences, Inc.

Greenwich LifeSciences is a clinical-stage biopharmaceutical company focused on the development of GP2, an immunotherapy to prevent breast cancer recurrences in patients who have previously undergone surgery. GP2 is a 9 amino acid transmembrane peptide of the HER2 protein, a cell surface receptor protein that is expressed in a variety of common cancers, including expression in 75% of breast cancers at low (1+), intermediate (2+), and high (3+ or over-expressor) levels. Greenwich LifeSciences has commenced a Phase III clinical trial, FLAMINGO-01. For more information on Greenwich LifeSciences, please visit the Company's website at www.greenwichlifesciences.com and follow the Company's Twitter at https://twitter.com/GreenwichLS.

Forward-Looking Statement Disclaimer

Statements in this press release contain "forward-looking statements" that are subject to substantial risks and uncertainties. All statements, other than statements of historical fact, contained in this press release are forward-looking statements. Forward-looking statements contained in this press release may be identified by the use of words such as "anticipate," "believe," "contemplate," "could," "estimate," "expect," "intend," "seek," "may," "might," "plan," "potential," "predict," "project," "target," "aim," "should," "will," "would," or the negative of these words or other similar expressions, although not all forward-looking statements contain these words. Forward-looking statements are based on Greenwich LifeSciences Inc.'s current expectations and are subject to inherent uncertainties, risks and assumptions that are difficult to predict, including statements regarding the intended use of net proceeds from the public offering; consequently, actual results may differ materially from those expressed or implied by such forward-looking statements. Further, certain forward-looking statements are based on assumptions as to future events that may not prove to be accurate. These and other risks and uncertainties are described more fully in the section entitled "Risk Factors" in Greenwich LifeSciences' Annual Report on Form 10-K for the year ended December 31, 2023 and other periodic reports filed with the Securities and Exchange Commission. Forward-looking statements contained in this announcement are made as of this date, and Greenwich LifeSciences, Inc. undertakes no duty to update such information except as required under applicable law.

Company ContactSnehal PatelInvestor RelationsOffice: (832) 819-3232Email: info@greenwichlifesciences.com

Investor & Public Relations Contact for Greenwich LifeSciencesDave GentryRedChip Companies Inc.Office: 1-800-RED CHIP (733 2447)Email: dave@redchip.com