On May 23, 2022 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, reported the following (Press release, Greenwich LifeSciences, MAY 23, 2022, View Source [SID1234614943]):
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We have completed the manufacturing of GP2, released 3 clinical lots, and started the stability testing program for these lots. Previously, the FDA informally asked us to allow them to review an updated chemistry and manufacturing section on drug product before initiating the Phase III trial as our manufacturing information for the final drug product was incomplete and the lots were being tested for the first time. Subsequently, we received a formal clinical hold letter. Greenwich has provided a response and is working with the FDA to resolve all outstanding issues. All hold issues are associated with manufacturing and pharmacy procedures.
We continue to work toward study initiation. We are scheduling site initiation visits to train clinicians, nurses, coordinators, and pharmacists to activate and open clinical sites. We, along with our CRO, continue to actively recruit and prepare sites for site initiation.
Dr. Jaye Thompson, VP Clinical and Regulatory Affairs, commented, "We continue to make progress towards opening up our first sites. We just completed our first Data Safety Management Board (DSMB) meeting and are currently scheduling our initial Steering Committee Meeting with the lead clinicians of FLAMINGO-01. Our electronic data capture and inventory management systems are anticipated to go live in June. We are working to address all FDA issues rapidly so that the study can be initiated shortly."
Three abstracts and two posters were accepted for presentation at the upcoming AACR (Free AACR Whitepaper) Annual Meeting 2022. The titles of the abstracts are as follows:
Abstract Number: LBA550; Poster Number: 322; Abstract Title: Evaluation of booster injections in maintaining peak immunity in a phase IIb study evaluating HER2/neu peptide GP2 (GLSI-100) versus GM-CSF alone after adjuvant trastuzumab in HER2 positive women with breast cancer.
Abstract Number: e12519; Abstract Title: Baseline GP2 immune response as an independent prognostic factor in a phase IIb study evaluating HER2/neu peptide GP2 (GLSI-100) versus. GM-CSF alone after adjuvant trastuzumab in HER2-positive women with breast cancer.
Abstract Number: TPS1110; Poster Number: 485b; Abstract Title: A randomized, multicenter, placebo-controlled, phase III study to evaluate the efficacy and safety of HER2/neu peptide GLSI-100 (GP2 + GM-CSF) in patients with residual disease or high-risk PCR after both neo-adjuvant and postoperative adjuvant anti-HER2 (Co-authored with Baylor College of Medicine)
CEO Snehal Patel commented, "These abstracts and posters highlight the first steps to optimizing the use of GLSI-100. We are planning to study the peak immunity of GP2 and how to assess when to administer booster injections. The current methodology is to deliver 6 primary injections over the first 6 months and 5 booster injections 6 months apart, thus totaling 11 injections over 3 years. However, in the future, we envision using immune response and T-cell profiles to determine when boosters may be needed. This may allow GLSI-100 to protect breast cancer survivors over longer periods of time against recurring metastatic breast cancer. In addition, approximately 20% of patients in the Phase IIb trial had a GP2 immune response before being treated with GP2, possibly due to a potential impending recurrence. We found that some patients with baseline immune response to GP2 tended to recur at faster rates. We are planning to study this observation in the Phase III trial, which could lead us to being able to use GP2 immune response as an independent prognosticator for impending recurrence. This would allow doctors to detect recurrences sooner than current standard of care and to thus start aggressive treatments sooner with potentially better outcomes."
Mr. Patel further added, "This will be the first ASCO (Free ASCO Whitepaper) meeting in person since 2019, attended by oncologists from around the world. Greenwich is in discussions with 2 of the largest oncology networks in Europe for participation in FLAMINGO-01, and we look forward to expanding our outreach to potential international sites at ASCO (Free ASCO Whitepaper). In the US, we anticipate that the largest oncology network will provide one of the first sites to treat patients and that a second oncology network in the US may participate along side. We believe that the participation of clinical trial networks focused on cancer treatment will help to increase the enrollment rate in FLAMINGO-01 and expand the geographic footprint to allow more patients to participate."
About the ASCO (Free ASCO Whitepaper) Annual Meeting
Founded in 1964, ASCO (Free ASCO Whitepaper) is the world’s leading professional organization for physicians and oncology professionals caring for people with cancer. ASCO (Free ASCO Whitepaper) offers premier scientific events for oncology professionals, patient advocates, industry representatives, and major media outlets worldwide. The ASCO (Free ASCO Whitepaper) 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: View Source
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 View Source
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.