Greenwich LifeSciences to Participate in Upcoming Jefferies, Wainwright, ASCO and BIO International Conferences

Greenwich LifeSciences, Inc. (Nasdaq: GLSI) (the “Company”), a clinical-stage biopharmaceutical company focused on the development of GLSI-100, an immunotherapy to prevent breast cancer recurrences in patients who have previously undergone surgery, today announced that Snehal Patel, CEO of Greenwich LifeSciences, will participate in the following upcoming investor, partnering, and scientific conferences:

H.C. Wainwright Global Investment Conference – May 23-26, 2022

The Company will be participating in the H.C. Wainwright Global Investment Conference in Miami, Florida with an in-person presentation and will be available to participate in one-on-one meetings with qualified members of the investor community who are registered to attend the conference. The conference will feature leading industry keynote speakers and presenting companies, investor one-on-one meetings, and networking opportunities with attendees. For more information, please visit the conference website at: https://hcwevents.com/globalconference/

American Society of Clinical Oncology (ASCO) Annual Meeting – June 3-7, 2022

The Company will present 2 posters and 3 abstracts at the ASCO Annual Meeting in Chicago, IL and will meet with clinical sites and networks participating in the upcoming FLAMINGO-01 phase III clinical trial. Founded in 1964, ASCO is the world's leading professional organization for physicians and oncology professionals caring for people with cancer. ASCO offers premier scientific events for oncology professionals, patient advocates, industry representatives, and major media outlets worldwide. The ASCO Annual Meeting program features poster presentations, poster discussion sessions, clinical science symposia, and dynamic education sessions about recent advancements in cancer research, treatment, and patient care. For more information, please visit the conference website at: https://conferences.asco.org/am/attend.

Jefferies Healthcare Conference – June 8-10, 2022

The Company will be participating in the Jefferies Healthcare Conference in New York, NY with an in-person presentation and will be available to participate in one-on-one meetings with qualified members of the investor community who are registered to attend the conference. This conference gathers leading executives, institutional investors, private equity investors, and venture capitalists to address investment opportunities and to discuss the current trends driving healthcare globally. Jefferies is one of the largest healthcare investment banking teams in the world with over 135 professionals worldwide based in New York, San Francisco, London and Hong Kong covering over 1010 companies.

BIO International Convention – June 13-16, 2022

The Company will be participating in the BIO International Convention in San Diego, CA with an in-person presentation and one-on-one partnering meetings. The convention attracts 15,000+ biotechnology and pharma leaders for one week of intensive networking including scheduled one-on-one meetings with senior business development executives seeking potential financial and strategic partners. For more information please visit: https://www.bio.org/events/bio-international-convention

The Company also previously participated in the following events:

Susan G. Komen’s More Than Pink Luncheon – March 10, 2022

The Company was an event sponsor and invited members of the upcoming FLAMINGO-01 clinical trial team to participate in this Houston, Texas event. The second annual More Than Pink™ Luncheon celebrated the vision of Komen’s founders with the hope and increasing promise of a cure. Susan G. Komen is the world’s leading nonprofit breast cancer organization, working to save lives and end breast cancer forever. Komen has an unmatched, comprehensive 360-degree approach to fighting this disease across all fronts and supporting millions of people in the U.S. and in countries worldwide. Visit www.komen.org.

BIO-Europe Spring – March 28-31, 2022

The Company participated in the BIO-Europe Spring partnering event which includes international business development, therapeutic areas, startup innovations, digital health, and scheduled one-on-one meetings with regional and global pharma companies. For more information, please visit the conference website at: https://informaconnect.com/bioeurope-spring/

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/neu 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 will be led by Baylor College of Medicine and will include US and international clinical sites from university-based hospitals and cooperative networks. 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 100 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. The trial is currently registered on clinicaltrials.gov and can be seen here. For future updates about FLAMINGO-01 please visit the Company’s clinical trial tab at https://greenwichlifesciences.com/clinical-trials/.

About Breast Cancer and HER2/neu Positivity

One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 282,000 new breast cancer patients and 3.8 million breast cancer survivors in 2021. HER2/neu (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/neu 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. In a completed randomized, single-blinded, placebo-controlled, multi-center Phase IIb clinical trial led by MD Anderson Cancer Center, no recurrences were observed in patients treated with GLSI-100 in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patients were treated, followed, and remained disease free over the first 6 months, which is the time required to reach peak immunity and thus maximum efficacy and protection (p = 0.0338). For the 146 patients who have been treated with GLSI-100 to date over 4 clinical trials, treatment was well tolerated and no serious adverse events were observed related to the immunotherapy. Greenwich LifeSciences is planning to commence a Phase III clinical trial using a similar treatment regime as the Phase IIb clinical trial. 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.

About GP2 Immunotherapy Immune Response

As previously reported, GP2 immunotherapy generated GP2-specific immune responses, leading to no metastatic breast cancer recurrence in the HER2/neu 3+ population in the Phase IIb clinical trial, thus supporting GP2’s mechanism of action. Statistically significant peak immunity was reached after 6 months of GP2 treatment, as measured in both the Dimer Binding Assay and the DTH skin test. HER2/neu 3+ population immune response was similar to the HER2/neu 1-2+ population immune response, suggesting the potential to treat the HER2/neu 1-2+ population (including triple negative breast cancer) with GP2 immunotherapy in combination with trastuzumab (Herceptin) based products and other clinically active agents. The broad based immune response suggests the potential for GP2 to treat other HER2/neu 1-3+ expressing cancers. For more information on GP2 immune response and clinical data, please visit the Company’s clinical trial tab at https://greenwichlifesciences.com/clinical-trials/.

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, 2021 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.

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GLSI to Participate in Upcoming Jefferies, Wainwright, ASCO and BIO International Conferences