GLSI Greenwich LifeSciences Inc.

38.85
-1.14  -3%
Previous Close 39.99
Open 39.77
52 Week Low 3.262
52 Week High 158.07
Market Cap $501,001,869
Shares 12,895,801
Float 4,048,201
Enterprise Value $478,592,314
Volume 33,458
Av. Daily Volume 121,777
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Drug Pipeline

Drug Stage Notes
GP2
Breast cancer
Phase 2b
Phase 2b
Phase 3 trial to be initiated in 2021.

Latest News

  1. Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, today announced that it is set to join the Russell 2000® and Russell 3000® Indexes at the conclusion of the Russell indexes annual reconstitution, effective after the US markets open on June 28, 2021.

    CEO Snehal Patel commented, "The addition of our company to the Russell 2000® Index is an important opportunity to increase our institutional ownership and reflects the progress we have made this past year. We welcome the enhanced visibility as we continue to develop our GP2 immunotherapy to prevent metastatic…

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, today announced that it is set to join the Russell 2000® and Russell 3000® Indexes at the conclusion of the Russell indexes annual reconstitution, effective after the US markets open on June 28, 2021.

    CEO Snehal Patel commented, "The addition of our company to the Russell 2000® Index is an important opportunity to increase our institutional ownership and reflects the progress we have made this past year. We welcome the enhanced visibility as we continue to develop our GP2 immunotherapy to prevent metastatic breast cancer. We look forward to sharing our future progress, including our planned Phase III clinical trial, with our expanding shareholder base."

    Russell indexes are widely used by investment managers and institutional investors for index funds and as benchmarks for active investment strategies. Approximately $10.6 trillion in assets are benchmarked against Russell's US indexes.

    FTSE Russell primarily uses objective, market-capitalization rankings, and style attributes to determine membership for its Russell indexes. Membership in the small-cap Russell 2000® Index, which remains in place for one year, is based on membership in the broad-market Russell 3000® Index. For more information on the Russell 2000® Index and the Russell indexes reconstitution, visit the FTSE Russell website at: https://www.ftserussell.com/resources/russell-reconstitution.

    About FTSE Russell

    FTSE Russell is a global index leader that provides innovative benchmarking, analytics and data solutions for investors worldwide. FTSE Russell calculates thousands of indexes that measure and benchmark markets and asset classes in more than 70 countries, covering 98% of the investable market globally. FTSE Russell index expertise and products are used extensively by institutional and retail investors globally. Approximately $17.9 trillion is currently benchmarked to FTSE Russell indexes. For over 30 years, leading asset owners, asset managers, ETF providers and investment banks have chosen FTSE Russell indexes to benchmark their investment performance and create ETFs, structured products and index-based derivatives. FTSE Russell is wholly owned by London Stock Exchange Group.

    About Breast Cancer and HER2/neu Positivity

    One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 266,000 new breast cancer patients and 3.1 million breast cancer survivors in 2018. 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. In a randomized, single-blinded, placebo-controlled, multi-center (16 sites led by MD Anderson Cancer Center) Phase IIb clinical trial, no recurrences were observed in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338). Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to GP2 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 titled "Risk Factors" in the final prospectus related to the public offering filed with the SEC. 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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    • Poster published at the 2021 American Society of Clinical Oncology (ASCO) Annual Meeting shows the final 5 year safety data from the Phase IIb breast cancer clinical trial.
    • Final safety conclusions are that GP2 immunotherapy is well tolerated and that no serious adverse events related to GP2 immunotherapy were reported over the full 5 year follow-up period.
    • Final 5 Year Data Set of GP2 Phase IIb Trial is Now Complete: Figure 1 of the poster shows a time series of the GP2 immunotherapy injections, adverse events (AE), immune response, and 100% disease-free survival (0% recurrence rate) in HER2 positive breast cancer patients over median 5 years. This time series highlights that the 10 GP2 immunotherapy injections over the first 2.5 years…
    • Poster published at the 2021 American Society of Clinical Oncology (ASCO) Annual Meeting shows the final 5 year safety data from the Phase IIb breast cancer clinical trial.
    • Final safety conclusions are that GP2 immunotherapy is well tolerated and that no serious adverse events related to GP2 immunotherapy were reported over the full 5 year follow-up period.
    • Final 5 Year Data Set of GP2 Phase IIb Trial is Now Complete: Figure 1 of the poster shows a time series of the GP2 immunotherapy injections, adverse events (AE), immune response, and 100% disease-free survival (0% recurrence rate) in HER2 positive breast cancer patients over median 5 years. This time series highlights that the 10 GP2 immunotherapy injections over the first 2.5 years (as depicted by the 10 arrows) created a potent immune response that peaked at 6 months. The immune response includes injection site and systemic reactions (types of adverse events) that also peaked at 6 months. These adverse events are a positive sign that the immune system responded to GP2 immunotherapy and prevented metastatic breast cancer recurrence. Adverse events were temporally associated with GP2 injections and declined after GP2 injections ended.

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, presented an abstract and poster of the final 5 year GP2 Phase IIb clinical trial safety data at the 2021 ASCO Annual Meeting.

    This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20210607005374/en/

    Figure 1 of Poster Presentation 542 from 2021 ASCO Annual Meeting Showing GP2 Immunotherapy 5 Year Time Series of Dosing, Safety, Immune Response, and Disease Free Survival from Phase IIb Clinical Trial (Graphic: Business Wire)

    Figure 1 of Poster Presentation 542 from 2021 ASCO Annual Meeting Showing GP2 Immunotherapy 5 Year Time Series of Dosing, Safety, Immune Response, and Disease Free Survival from Phase IIb Clinical Trial (Graphic: Business Wire)

    The abstract can be viewed at the bottom of this press release, and the full poster, Figures 1-2, Tables 1-2, and an audio track of the poster by VP of Clinical & Regulatory Affairs Jaye Thompson can be accessed and downloaded at: https://greenwichlifesciences.com/clinical-trials/.

    It has been previously reported that the completion of the GP2 immunotherapy (GP2+GM-CSF) Primary Immunization Series (PIS) reduced recurrence rates to 0% over a 5 year follow-up period in HER2 3+ patients who had received a standard course of trastuzumab after surgery. The abstract and poster present the final safety data over the 5 year follow-up period, assessing the safety of GP2 immunotherapy and its relationship to previously presented peak immunity and recurrence rate data.

    Summary of the Final 5 Year Safety Data:

    • GP2 immunotherapy is well-tolerated and no safety signal for GP2 was identified. Additionally, no serious adverse events related to GP2 immunotherapy were reported over the full 5 year treatment and follow-up periods.
    • The majority of patients experienced mild or moderate injection site reactions, which accounted for approximately 70% of reported adverse events.
    • The incidence of adverse events was similar across HER2 3+ and HER2 1-2+ breast cancer patients, consistent with the previously reported findings that the immune response was similar across both patient populations, suggesting that GP2 immunotherapy could be a potential treatment in HER2 1-2+ patients or in other HER2 expressing cancers.

    Snehal Patel, CEO of Greenwich LifeSciences, commented, "The final 5 year analysis of the safety data in the Phase IIb trial is now complete and represents an important milestone for the Company. With the recurrence rate or disease free survival (SABCS 2020), immune response (AACR 2021), and now safety data (ASCO 2021), the final design of the planned Phase III trial can be completed. This final combined data set encourages us to utilize the same treatment strategy in the planned Phase III trial to conservatively reproduce these promising results that showed that GP2 immunotherapy may prevent metastatic breast cancer recurrence. In addition, this final data set can now be presented to investors and strategic parties interested in partnering with the Company to co-develop and license GP2."

    Excerpts from the ASCO Poster 542:

    Title: Final five year median follow-up safety data from a prospective, randomized, placebo-controlled, single-blinded, multicenter, phase IIb study evaluating the use of HER2/neu peptide GP2 + GM-CSF vs. GM-CSF alone after adjuvant trastuzumab in HER2 positive women with operable breast cancer

    Safety data was analyzed to assess injection site reactions and systemic adverse events (AEs) of each treatment arm. Most patients completed the planned PIS: 81 (91.0%) GP2+GM-CSF and 86 (94.5%) GM-CSF only. In addition, 77 GP2+GM-CSF and 80 GM-CSF only patients received all 4 booster injections. The most common injection site reactions were erythema, induration and pruritis, and they occurred with similar frequency in the two treatment arms. Injection site reactions were reported by almost all patients over the course of vaccinations. Occurring in a smaller percentage of patients, the most common systemic adverse events were fatigue, headache, and myalgia/arthralgia, again with similar incidence by treatment arm. The majority of all events reported were of grade 1, mild severity. Five GP2+GM-CSF patients reported 6 events considered definitely, possibly or probably related to study medication, which were grade 3 or 4: induration (2), urticaria, rash, pruritis, and arthralgia. Urticaria, allergic reaction and hypersensitivity reaction were considered possibly related events of grade 3 or 4 in GM-CSF only patients. No serious adverse events considered related to study medication were reported over the full 5 year treatment and follow-up periods.

    Figure 2 of the poster shows the maximal severity grade for any adverse event, systemic and injection site reaction, for each patient. There was no difference between the two treatment arms. The majority of events were of grade 1, mild severity. Two patients reported grade 4 adverse events deemed unrelated to GP2 immunotherapy. One GP2+GM-CSF patient experienced grade 4 hypoglycemia and recovered. A GM-CSF only patient was diagnosed with renal cell carcinoma, a second primary diagnosis, which was classified as grade 4.

    Tables 1 & 2 of the poster show the incidence of adverse events by HER2 status. The first occurrence of frequently reported adverse events are tabulated in Table 1. The most common adverse event was injection site reaction. Almost every patient, in both the GP2+GM-CSF and GM-CSF only arms, reported injection site reactions. The most frequent injection site reactions were erythema, pruritus and induration, as presented in Table 2. The incidence of adverse events were similar across HER2 3+ and HER2 1-2+ patients, which is consistent with the previously reported findings that immune response was similar across HER2 3+ and HER2 1-2+ patients.

    ASCO Abstract 542:

    Title: Final five-year median follow-up safety data from a prospective, randomized, placebo-controlled, single-blinded, multicenter, phase IIb study evaluating the use of HER2/neu peptide GP2 + GM-CSF vs. GM-CSF alone after adjuvant trastuzumab in HER2 positive women with operable breast cancer.

    Snehal Patel, David McWilliams, Christine T Fischette, Jaye Thompson, Mira Patel, and F Joseph Daugherty.

    Greenwich LifeSciences, Stafford, TX

    Background: The final analysis of the GP2 prospective, randomized, placebo-controlled, single-blinded, multicenter Phase IIb trial investigating GP2+GM-CSF administered in the adjuvant setting to node-positive and high-risk node-negative breast cancer patients with tumors expressing any degree of HER2 (immuno-histochemistry [IHC] 1-3+) (NCT00524277) is now complete with 5 year follow-up. The trial enrolled HLA-A02 patients randomized to receive GP2+GM-CSF versus GM-CSF alone. It was previously reported that completion of the GP2+GM-CSF Primary Immunization Series (PIS) reduced recurrence rates to 0% over a 5 year follow-up period in HER2 3+ patients, who received a standard course of trastuzumab after surgery.

    Methods: Each enrolled and consented patient was randomly scheduled to receive a total of 6 GP2+GM-CSF (500 mcg GP2: 125 mcg GM-CSF) or GM-CSF only intradermal injections every 3-4 weeks as part of the PIS for the first 6 months and 4 GP2+GM-CSF or GM-CSF only booster intradermal injections every 6 months thereafter. Boosters were introduced during the trial, thus some patients did not receive all 4 boosters. Injection sight reactions were measured.

    Results: Safety data was analyzed to assess local and systemic toxicity of each treatment arm. Most subjects completed the planned PIS, 81 (91.0%) GP2+GM-CSF and 86 (94.5%) GM-CSF only. In addition, 77 GP2+GM-CSF and 80 GM-CSF only subjects received all 4 booster injections. The most common local toxicities were erythema, induration and pruritis and they occurred with similar frequency in the two treatment arms. Local reactions were reported by almost all subjects over the course of vaccinations. Occurring in a smaller percentage of subjects, the most common systemic toxicities were fatigue, headache, and myalgia/arthralgia, again with similar incidence by treatment group. The majority of all events reported were of Grade 1 mild severity (GP2+GM-CSF 92.5%, GM-CSF only 90.6%). Only 5 events in 4 subjects were considered Grade 3: induration and maculopapular rash/pruritis, in two GP2+GM-CSF subjects and chest pain and hypersensitivity reaction in two GM-CSF only subjects. The incidence of local reactions minimally increased with subsequent vaccinations; however, the types of events remain unchanged. No serious adverse events were reported over the full 5 year treatment and follow-up periods.

    Conclusions: The study confirms the finding from the Phase I trial evaluating GP2+GM-CSF that the vaccine is safe and well-tolerated. The majority of patients experienced only mild local and systemic toxicities. Importantly, toxicities in the GP2+GM-CSF group were comparable to those seen in the GM-CSF only group, suggesting the toxicities are attributable to GM-CSF.

    About the 2021 ASCO Annual Meeting

    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.

    About Breast Cancer and HER2/neu Positivity

    One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 266,000 new breast cancer patients and 3.1 million breast cancer survivors in 2018. 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. In a randomized, single-blinded, placebo-controlled, multi-center (16 sites led by MD Anderson Cancer Center) Phase IIb clinical trial, no recurrences were observed in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338). Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to GP2 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.

    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 titled "Risk Factors" in the final prospectus related to the public offering filed with the SEC. 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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    • Previously led partnering transactions and strategic analyses for multiple companies, including Roche, Pfizer, and Novartis
    • Dr. Fischette will focus on out-licensing the Company's lead drug candidate for recurring breast cancer, GP2, and building a clinical pipeline to complement GP2
    • Dr. Fischette has 25+ years of experience in research, clinical development, commercialization, and business development at Big Pharma, leveraging her Ph.D. in Biology and Physiology

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, today announced the appointment of…

    • Previously led partnering transactions and strategic analyses for multiple companies, including Roche, Pfizer, and Novartis
    • Dr. Fischette will focus on out-licensing the Company's lead drug candidate for recurring breast cancer, GP2, and building a clinical pipeline to complement GP2
    • Dr. Fischette has 25+ years of experience in research, clinical development, commercialization, and business development at Big Pharma, leveraging her Ph.D. in Biology and Physiology

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, today announced the appointment of Christine Fischette, Ph.D., to Vice President of Business Development.

    Dr. Fischette commented, "I am very excited to lead the effort in building an expanded pipeline for the Company. The release of our final 5 year safety data from our Phase IIb trial at the upcoming ASCO conference, combined with our previously released clinical outcome and immune response data at SABCS 2020 and AACR 2021, will give us a complete data package to present to Big Pharma for the out-licensing of GP2. The GP2 Phase IIb clinical data showed no breast cancer recurrences in HER2+ patients over 5 years and a peak immune response after 6 months of treatment. If the final safety data is positive, which we expect it to be, we will have a compelling product profile which compares favorably to commercialized breast cancer drugs as well as those currently under development. Breast cancer survivors seek safe and effective drugs to prevent metastatic breast cancer recurrence. GP2 may represent a paradigm shift in the way we treat recurring breast cancer. I look forward to developing a partnership with Big Pharma to help us maximize the potential of GP2."

    CEO Snehal Patel added, "We are thrilled that Dr. Fischette is joining the Company. While she was invaluable in advising the Company in the past through our engagement with Torreya Partners, her expanded role and responsibilities inside the Company will not only include exploring strategic partnerships with Big Pharma for GP2, but will also include adding additional products to our clinical pipeline. Both of these activities are high priorities for the Company. We also look forward to Dr. Fischette's contributions to our management team as we seek to expand the GP2 market from HER 2+ breast cancer to triple negative breast cancer and other HER2 expressing cancers, where the market potential of GP2 may exceed $5 billion."

    Dr. Fischette has over 30 years of experience in strategic and operational roles within research, drug development, commercialization, business development, and general management in the BioPharma industry. She has advised companies on growth strategies, business development, licensing, and drug development. She has also consulted for investment banks, biotech companies, academic institutions, non-profits, and she was a faculty member for BIO's Business Development Fundamentals Course offered annually by BIO. Previously, Dr. Fischette worked at Torreya Partners, Novartis, Pfizer, and Roche. She served as Head of Negotiation and Board Director for several therapeutic business units at Novartis. At Pfizer, she orchestrated the entire drug development/marketing process of a therapeutic from formulation selection to successful commercialization with net sales eventually reaching $350 million. She has authored over 50 publications in peer-reviewed publications, including Science while at Rockefeller University and other institutions. Dr. Fischette received a B.A. in Biology Education from Rutgers University and a Ph.D. in Physiology from Rutgers Biomedical Health Sciences, formerly known as the University of Medicine and Dentistry of New Jersey.

    About Breast Cancer and HER2/neu Positivity

    One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 266,000 new breast cancer patients and 3.1 million breast cancer survivors in 2018. 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. In a randomized, single-blinded, placebo-controlled, multi-center (16 sites led by MD Anderson Cancer Center) Phase IIb clinical trial, no recurrences were observed in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338). Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to GP2 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/#Phase-IIb-AACR.

    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 titled "Risk Factors" in the final prospectus related to the public offering filed with the SEC. 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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    • The GP2 Phase III clinical trial design was presented in a poster during the 2021 American Association for Cancer Research (AACR) Annual Meeting, introduced by the Global Principal Investigator, Professor Mothaffar F. Rimawi of Baylor College of Medicine.
    • The Company plans to complete manufacturing of GP2 by the end of the 3rd quarter 2021 and plans to commence the Phase III clinical trial thereafter.
    • A third open-label arm has been added to the Phase III trial to test GP2 in HLA types other than HLA-A02 and to assess immune response and clinical outcome. This third arm will function similar to a Phase II trial, thus creating potential for early immune response data analysis and proof of concept that GP2 can treat other HLA types, which…
    • The GP2 Phase III clinical trial design was presented in a poster during the 2021 American Association for Cancer Research (AACR) Annual Meeting, introduced by the Global Principal Investigator, Professor Mothaffar F. Rimawi of Baylor College of Medicine.
    • The Company plans to complete manufacturing of GP2 by the end of the 3rd quarter 2021 and plans to commence the Phase III clinical trial thereafter.
    • A third open-label arm has been added to the Phase III trial to test GP2 in HLA types other than HLA-A02 and to assess immune response and clinical outcome. This third arm will function similar to a Phase II trial, thus creating potential for early immune response data analysis and proof of concept that GP2 can treat other HLA types, which would expand GP2's market by HLA type from 50% up to 80% or more.
    • In some clinical sites for the Phase III trial, up to 8 immune response tests will be taken over time to assess immune response beyond the 2.5 years tracked in the Phase IIb trial, thus providing additional high quality immune response data to help identify responders and correlations to clinical outcome.
    • The Phase III trial design will include an event-driven interim analysis for superiority or futility. This analysis will be conducted when approximately half of the expected breast cancer recurrences have occurred, which may allow for submission of a Biologics Licensing Application (BLA) to the FDA for conditional marketing approval of GP2 approximately halfway through the trial.

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, today announced the publication of a second poster for the GP2 Phase III clinical trial design for recurring breast cancer at the 2021 AACR Annual Meeting. The Global Principal Investigator of the GP2 Phase III clinical trial, Dr. Mothaffar F. Rimawi of the Dan L Duncan Comprehensive Cancer Center at Baylor College of Medicine, is the lead author of the poster and has recorded an audio track providing an overview.

    This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20210414005362/en/

    Poster Presentation CT256 from 2021 AACR Annual Meeting Showing GP2 Phase III Clinical Trial Design for Recurring Breast Cancer (Graphic: Business Wire)

    Poster Presentation CT256 from 2021 AACR Annual Meeting Showing GP2 Phase III Clinical Trial Design for Recurring Breast Cancer (Graphic: Business Wire)

    The AACR published the Phase III trial design abstract on April 9, 2021 and the poster on April 10, 2021. The abstract can be viewed at the bottom of this press release and the full poster with audio can be accessed or downloaded on the Company website at https://greenwichlifesciences.com/clinical-trials/#Phase-III.

    Snehal Patel, CEO of Greenwich LifeSciences, commented, "At present, the Phase III trial is designed to treat up to 500 patients. The data read out for the interim analysis will be event driven and could be completed approximately halfway through the planned 5 year follow-up. The recently reported robust immune response data, which peaked after 6 months in the Phase IIb trial, will help to finalize the Phase III trial design, including the immune response monitoring strategy. We will also assess immune response in an open-label third arm across multiple HLA types to potentially expand the market for GP2. This immune response data could be reported before the interim analysis."

    Updated Phase III Clinical Trial Design: The Company and the Baylor College of Medicine presented the updated design of the planned Phase III clinical trial to breast cancer key opinion leaders. The Phase III clinical trial is a prospective, randomized, double-blinded, multi-center trial. The primary efficacy endpoints for the three arms of the Phase III trial are invasive Disease Free Survival (iDFS). The objective is to conservatively reproduce the Phase IIb trial results which demonstrated 100% iDFS with 5 years of follow-up in the HER2/neu 3+ population.

    In addition to the trial design updates in the bullet points above, patients meeting all entry criteria will be randomized to receive either GP2 + GM-CSF or placebo. The Phase III trial design includes the use of saline in the placebo arm, instead of GM-CSF, which was used in the placebo arm of the Phase IIb trial. GM-CSF is not the standard of care and may cause immune responses in placebo patients.

    Dr. Jaye Thompson, VP of Clinical and Regulatory Affairs, added, "It is critical that the study population and design in the protocol are carefully crafted so that the resulting data provides convincing evidence of safety and efficacy for the BLA submission. We have already engaged a statistician to design the interim analysis and have begun recruiting clinicians and clinical sites for participation in the Phase III trial."

    AACR Abstract CT256

    Title: A prospective, randomized, multicenter, double-blinded, placebo-controlled phase III trial of the HER2/neu peptide GP2 + GM-CSF versus bacteriostatic saline/WFI placebo as adjuvant therapy after any trastuzumab-based therapy in HER2-positive women with operable breast cancer

    Snehal S Patel1, David B McWilliams1, Christine T Fischette1, Jaye Thompson1, F Joseph Daugherty1, C Kent Osborne2 and Mothaffar F Rimawi2.

    1Greenwich LifeSciences, Stafford, TX; 2Baylor College of Medicine, Houston, TX

    Background: GP2 is a biologic nine amino acid peptide of the HER2/neu protein delivered in combination with an FDA-approved immunoadjuvant Granulocyte-Macrophage Colony Stimulating Factor (GM-CSF, Sargramostim, Leukine) that stimulates an immune response targeting HER2/neu expressing cancers. In a prospective, randomized, single-blinded, placebo-controlled, multicenter Phase IIb clinical trial completed in 2018, no recurrences were observed in the HER2/neu positive adjuvant setting after median 5 years of follow-up, if the HLA 2+ patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338) in a pre-specified subgroup analysis. Furthermore, the GP2 immunotherapy elicited a potent immune response measured by local skin tests and immunological assays. Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to the GP2 immunotherapy. This Phase III trial aims to reproduce the Phase IIb study and will explore the use of GP2 + GM-CSF as adjuvant therapy to prevent the recurrence of breast cancer in HER2/neu positive and HLA 2+ patients, post-surgery and following the first year treatment with any trastuzumab-based therapy.

    Trial Design: This Phase III trial is a prospective, randomized, double-blinded, multi-center study. After 1 year of trastuzumab-based therapy or an approved biosimilar, treatment with GP2 + GM-CSF or placebo (Bacteriostatic Saline/WFI) will be administered intradermally for the 6 primary immunization series over the first 6 months and 5 subsequent boosters over the next 2.5 years for a total of 11 injections over 3 years of treatment. The participant duration of the trial will be 3 years treatment plus 2 years follow-up for a total of 5 years following the first year treatment with trastuzumab-based therapy or approved biosimilar. An interim analysis is planned and patients will be stratified based on prior and current treatments, among other factors.

    Eligibility Criteria: The majority of breast cancer patients will be HER2/neu positive and HLA 2+, disease-free, conventionally treated node-positive, post breast tumor removal surgery and following the first year treatment with trastuzumab-based therapy.

    Trial Objectives:

    1. To determine if GP2 therapy reduces recurrence in HER2/neu positive breast cancer patients.
    2. To monitor the in vitro and in vivo immunologic responses to GP2 therapy and correlate these responses with the clinical outcomes.
    3. To monitor for any unexpected adverse events and toxicities related to GP2 therapy.

    Accrual: The target enrollment is up to approximately 500 patients.

    Funding: This trial is supported by Greenwich LifeSciences.

    About the AACR Annual Meeting 2021

    The AACR is the first and largest cancer research organization dedicated to accelerating the conquest of cancer and has more than 48,000 members residing in 127 countries and territories. The AACR Annual Meeting program covers the latest discoveries across the spectrum of cancer research — from population science and prevention; to cancer biology, translational, and clinical studies; to survivorship and advocacy — and highlights the work of the best minds in research and medicine from institutions all over the world.

    About Breast Cancer and HER2/neu Positivity

    One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 266,000 new breast cancer patients and 3.1 million breast cancer survivors in 2018. 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. In a randomized, single-blinded, placebo-controlled, multi-center (16 sites led by MD Anderson Cancer Center) Phase IIb clinical trial, no recurrences were observed in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338). Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to GP2 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/#Phase-IIb-AACR.

    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 titled "Risk Factors" in the final prospectus related to the public offering filed with the SEC. 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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    • Poster published on April 10th at the 2021 American Association for Cancer Research (AACR) Annual Meeting shows the GP2 final 5 year immune response data from the Phase IIb clinical trial, concluding that GP2 immunotherapy generated GP2-specific immune responses leading to promising clinical benefit, thus supporting GP2's mechanism of action.
    • The corresponding abstract can be viewed at the bottom of this press release and the full poster, Figures 1-3, and an audio track of the poster can be accessed or downloaded from the Clinical Trial tab of the Company website: https://greenwichlifesciences.com/clinical-trials/#Phase-IIb-AACR. The audio track, given by Dr. Jaye Thompson, Vice President of Clinical and Regulatory Affairs, can be directly…
    • Poster published on April 10th at the 2021 American Association for Cancer Research (AACR) Annual Meeting shows the GP2 final 5 year immune response data from the Phase IIb clinical trial, concluding that GP2 immunotherapy generated GP2-specific immune responses leading to promising clinical benefit, thus supporting GP2's mechanism of action.
    • Immune responses to GP2 were measured over time using a CD8 T cell dimer binding assay (Dimer Binding Assay) and delayed-type-hypersensitivity (DTH) skin tests. The Dimer Binding Assay detects the percentage of GP2 specific killer T cells that can kill recurring cancer cells. The DTH skin test measures the diameter of the skin immune response to GP2 in millimeters 48-72 hours after injection of GP2 without GM-CSF.
    • Figure 1 of the poster shows that GP2 immunity peaked at 6 months in HER2 3+ patients after they completed their first 6 immunizations, as measured by the Dimer Binding Assay. The data also shows that for the 2.5 years that the immune response was measured, the immunity was sustained and remained above baseline, resulting in 100% disease free survival (0% recurrence rate) over 5 years. In the placebo arm, the immune response was not as robust, resulting in 89% disease free survival (11% recurrence rate).
    • Figure 2 of the poster shows the same Dimer Binding Assay data for HER2 3+ patients as in Figure 1, where the GP2 treated patients showed statistically significant dimer readings versus baseline at 3, 6, and 12-13 months.
    • Figure 3 of the poster shows that after completion of the 6th immunization after 6 months, GP2 treated patients showed a robust immune response using the DTH skin test, while the placebo did not (p = 0.009). Within GP2-treated patients, the change from baseline after 6 months was a median of 4.8 mm (mean of 11.6 mm), which was a statistically significant increase over baseline (p < 0.0001). This DTH data supports the Dimer Binding Assay data that shows a peak immune response after 6 months.

    Greenwich LifeSciences, Inc. (NASDAQ:GLSI) (the "Company"), 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, presented a poster of the final 5 year GP2 Phase IIb clinical trial immune response data on April 10th at the 2021 AACR Annual Meeting. Immune response is the primary mechanism of action for GP2 and is critical to developing dosing and booster treatment strategies that are designed to achieve and sustain peak immunity, as well as to prevent metastatic breast cancer recurrences.

    This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20210412005340/en/

    Figures 1-3 of Poster Presentation CT183 from 2021 AACR Annual Meeting Showing GP2 5 Year Immune Response Data (Graphic: Business Wire)

    Figures 1-3 of Poster Presentation CT183 from 2021 AACR Annual Meeting Showing GP2 5 Year Immune Response Data (Graphic: Business Wire)

    It has been previously reported that the completion of the GP2+GM-CSF Primary Immunization Series (PIS) reduced recurrence rates to 0% over a 5 year follow-up period in HER2 3+ patients who had received a standard course of trastuzumab after surgery. The abstract and poster present the final immune response results over the 5 year follow-up period, assessing peak immunity compared to baseline and between patients treated with GP2+GM-CSF versus GM-CSF alone, including by HER2 status.

    Summary of the Final 5 Year Immune Response Data as Previously Presented:

    • Potent immune response data supports the previously reported clinical outcome of 0% metastatic breast cancer recurrences over 5 years of follow up, if a patient completes the Primary Immunization Series over the first 6 months of GP2 treatment.
    • 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 3+ population immune response was similar to the HER2 1-2+ population immune response, suggesting the potential to treat the HER2 1-2+ population (including triple negative breast cancer) with GP2 immunotherapy in combination with trastuzumab (Herceptin) based products and other clinically active agents.
    • Broad based immune response suggests that GP2 immunotherapy and Herceptin based products may also have the potential to treat other HER2 1-3+ expressing cancers.

    Dr. Thompson commented, "The analysis of the immune response data in the Phase IIb trial provides mechanistic confirmation of treatment effect correlated with the clinical response previously reported. GP2 treated patients, independent of their HER2 status, experienced a potent immune response to GP2, far greater than patients treated with placebo. In addition, this data has provided us with insight that will guide the upcoming Phase III trial. We believe that monitoring immune response will be an important aspect of the Phase III trial."

    Excerpts from the AACR Poster CT183:

    Title: Final five year median follow-up data from a prospective, randomized, placebo-controlled, single-blinded, multicenter, phase IIb study evaluating a time series of immune responses using HER2/neu peptide GP2 + GM-CSF vs. GM-CSF alone after adjuvant trastuzumab in HER2 positive women with operable breast cancer

    Each GP2 treated patient was scheduled to receive 6 intradermal injections with GP2+GM-CSF over the first 6 months of treatment as part of the Primary Immunization Series and 4 boosters every 6 months thereafter. Placebo patients received intradermal injections with GM-CSF alone.

    Immune responses to GP2 were measured over time using a CD8 T cell dimer binding assay (Dimer Binding Assay) and delayed-type-hypersensitivity (DTH) skin tests. The Dimer Binding Assay detects the percentage of GP2 specific killer T cells that can kill recurring cancer cells. The DTH skin test measures the diameter of the skin immune response to GP2 in millimeters 48-72 hours after injection of GP2 without GM-CSF.

    Figure 1 of the poster shows that GP2 immunity peaked at 6 months in HER2 3+ patients after they completed their first 6 immunizations, as measured by the Dimer Binding Assay. The data also shows that for the 2.5 years that the immune response was measured, the immunity was sustained and remained above baseline, resulting in 100% disease free survival (0% recurrence rate) over 5 years. In the placebo arm, the immune response was not as robust, resulting in 89% disease free survival (11% recurrence rate). Immune response in GP2-treated patients increased quickly during the Primary Immunization Series and remained statistically significantly above baseline for 6 months after the completion of the Primary Immunization Series. Some patients received boosters beginning at 12 months and the immune response was assessed one month after the receiving the booster.

    Dimer Binding Assay: The Dimer Binding Assay detects the percentage of GP2 specific killer T cells that can kill recurring cancer cells. Ex vivo immune response was assessed over 2.5 years with blood draws at baseline, then after the 3rd and 6th immunizations in the Primary Immunization Series, and then after each booster. Immune responses were assessed by phenotypic clonal expansion assays in the majority of patients (n=113). GP2-specific CTLs were quantified in patients treated with GP2 using the Ig:A2 Dimer Assay and demonstrated an expansion over time, showing an increase over baseline after the 3rd immunization and remaining elevated for the entire course of follow-up.

    Figure 2 of the poster shows the same Dimer Binding Assay data for HER2 3+ patients as in Figure 1, where the GP2 treated patients showed statistically significant dimer readings versus baseline (pre-vaccination) at 3, 6, and 12-13 months.

    DTH Skin Test: The DTH skin test measures the diameter of the skin immune response to GP2 in millimeters, 48-72 hours after intradermal injection of GP2 without GM-CSF. A DTH reaction was used to assess in vivo immune responses in patients (n=150). The DTH orthogonal mean of the skin wheal was measured 48-72 hours after injection using the sensitive ballpoint-pen method and is compared using a Wilcoxon Rank-Sum. For GP2 treated patients, there was a significant increase in DTH reactions after the PIS compared to baseline DTH reactions.

    Figure 3A shows that after completion of the 6th immunization after 6 months, GP2 treated patients showed a robust immune response using the DTH skin test, while the placebo did not (p = 0.009). Within GP2 treated patients, the change from baseline after 6 months was a median of 4.8 mm (mean of 11.6 mm), which was a statistically significant increase over baseline (p < 0.0001). The change from baseline in DTH at 6 months was more robust in the GP2 treated patients. Those patients had an 11.6 mm mean increase in DTH after 6 months of exposure while patients treated with GM-CSF alone had a 5.2 mm mean increase (p = 0.023). This DTH data supports the Dimer Binding Assay data that shows a peak immune response after 6 months.

    Figure 3B shows that the DTH immune response for GP2 treated patients was similarly robust in HER2 3+ patients and HER2 1-2+ patients, independent of prior trastuzumab treatment and HER2 expression levels. Thus, GP2's robust immune response in the HER2 1-2+ population suggests the potential to apply GP2 immunotherapy to HER2 low to intermediate expressing breast cancers, as well as to other HER2 1-3+ expressing cancers.

    AACR Abstract CT183:

    Title: Final five year median follow-up data from a prospective, randomized, placebo-controlled, single-blinded, multicenter, phase IIb study evaluating a time series of immune responses using HER2/neu peptide GP2 + GM-CSF vs. GM-CSF alone after adjuvant trastuzumab in HER2 positive women with operable breast cancer

    Snehal S Patel, David B McWilliams, Mira S Patel, Christine T Fischette, Jaye Thompson and F Joseph Daugherty.

    Greenwich LifeSciences, Stafford, TX

    Background: The final analysis of the GP2 prospective, randomized, placebo-controlled, single-blinded, multicenter Phase IIb trial (NCT00524277) investigating GP2+GM-CSF versus GM-CSF alone in HLA-A02 patients administered in the adjuvant setting to node-positive and high-risk node-negative breast cancer patients with HER2 status (IHC 1-3+) is now complete with 5 year follow-up. It has been previously reported that completion of the GP2+GM-CSF Primary Immunization Series (PIS) reduced recurrence rates to 0% over a 5 year follow-up period in HER2 3+ patients, who received a standard course of trastuzumab after surgery. Here we present the final immune response results, assessing peak immunity compared to baseline and between GP2 treated patients versus placebo, including by HER2 status. Interim analyses for this trial have been previously reported by Mittendorf et al.

    Methods: Each GP2-treated patient was scheduled to receive 6 GP2+GM-CSF intradermal injections over the first 6 months as part of the PIS and 4 GP2+GM-CSF booster intradermal injections every 6 months thereafter. Placebo patients received GM-CSF only intradermal injections. Immune responses to GP2 were measured over time using delayed-type-hypersensitivity (DTH) skin tests and CD8 Tcell dimer binding assays.

    Results: This basket trial explored HER2 3+ patients, who received a standard course of trastuzumab after surgery, and HER2 1-2+ patients, who did not receive trastuzumab after surgery. A DTH reaction was used to assess in vivo immune responses in patients (n=145). The DTH orthogonal mean was measured 48-72 hours after injection using the sensitive ballpoint-pen method and are compared using a Wilcoxon Rank-Sum. For GP2 treated patients, there was a significant increase in DTH reactions after the PIS compared to baseline DTH reactions. The DTH orthogonal mean in GP2 treated patients at baseline had a median 0.0mm versus 10.8mm after the PIS. For patients receiving GM-CSF alone, the DTH orthogonal mean prior to and after the PIS had a median of 0.0mm. In addition, the DTH reactions after the PIS were significantly greater in GP2 treated patients than in placebo patients (10.8mm vs. 0.0mm, p=0.009) and the DTH immune response in GP2 treated patients was similar between HER2 3+ and HER2 1-2+ patients. Ex vivo immune responses were assessed by phenotypic clonal expansion assays in the majority of patients (n=114). GP2-specific CTLs were quantified using the Ig:A2 dimer assay and demonstrated a gradual expansion over time reaching statistical significance approximately 6 months after the PIS compared to baseline in the GP2 treated patients (n=53, p=0.010) but not in the control patients (n=39, p=0.165).

    Conclusions: Immunological data comparing peak immunity to baseline and GP2 treated patients to placebo showed that GP2 treated patients, independent of HER2 status, experienced a significant increase in their immune response while those receiving GM-CSF only did not. Future studies may explore the use of immune responses to assess: immunogenicity of GP2 by HLA type, timing of boosters to sustain immunity, clinical site performance, and the discontinuation of treatment for non-responders.

    About the AACR Annual Meeting 2021

    The AACR is the first and largest cancer research organization dedicated to accelerating the conquest of cancer and has more than 48,000 members residing in 127 countries and territories. The AACR Annual Meeting program covers the latest discoveries across the spectrum of cancer research — from population science and prevention; to cancer biology, translational, and clinical studies; to survivorship and advocacy — and highlights the work of the best minds in research and medicine from institutions all over the world.

    About Breast Cancer and HER2/neu Positivity

    One in eight U.S. women will develop invasive breast cancer over her lifetime, with approximately 266,000 new breast cancer patients and 3.1 million breast cancer survivors in 2018. 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. In a randomized, single-blinded, placebo-controlled, multi-center (16 sites led by MD Anderson Cancer Center) Phase IIb clinical trial, no recurrences were observed in the HER2/neu 3+ adjuvant setting after median 5 years of follow-up, if the patient received the 6 primary intradermal injections over the first 6 months (p = 0.0338). Of the 138 patients that have been treated with GP2 to date over 4 clinical trials, GP2 treatment was well tolerated and no serious adverse events were observed related to GP2 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.

    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 titled "Risk Factors" in the final prospectus related to the public offering filed with the SEC. 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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