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Breakthrough in Clinical Trial Data: Biopharmaceutical company Greenwich Lifesciences Inc (NASDAQ: GLSI) recently announced the latest analysis results of its core immunotherapy GP2 in adjuvant treatment for breast cancer.

Breakthrough in Clinical Trial Data: Biopharmaceutical company Greenwich Lifesciences Inc (NASDAQ: GLSI) recently announced the latest analysis results of its core immunotherapy GP2 in adjuvant treatment for breast cancer.

老虎证券老虎证券2026/03/18 10:24
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Preliminary data show that in the subgroup of patients without the HLA-A*02 genotype, GP2 treatment can significantly reduce breast cancer recurrence rates by 70%-80%. This data comes from a follow-up analysis of a Phase IIb clinical trial involving approximately 160 HER2/neu-positive breast cancer patients who have completed standard treatment. Genotyping and Efficacy Correlation Highlighted GP2 is a peptide immunotherapy targeting the HER2/neu protein, activating specific T cells to attack tumor cells expressing HER2. This analysis focuses on the impact of different HLA genotypes on efficacy: in the HLA-A*02-positive group, which accounts for about 60% of the patient population, GP2 previously showed zero recurrence rate; while the current non-HLA-A*02 group (about 40%) also demonstrated significant efficacy, with safety data consistent with previous results. This suggests that GP2 may possess broad-spectrum anti-tumor potential across genetic subtypes, providing a new direction for personalized cancer immunotherapy. Industry Background and Competitive Landscape Currently, the global breast cancer immunotherapy field is still dominated by giants such as Roche and Merck, but there remains a huge unmet need for adjuvant therapies targeting high-risk populations. If GP2 proves its efficacy in Phase III clinical trials, it is expected to become the first immunotherapy focused on preventing recurrence of HER2-positive breast cancer. It is noteworthy that recently, pharmaceutical companies such as Pfizer and Bristol Myers Squibb have increased their investment in the oncology immunotherapy sector, but mostly focus on PD-1/PD-L1 inhibitor combination therapies. GP2’s differentiated positioning may create a unique space for its commercialization. Capital Market Response and Subsequent Milestones Although this data is still from early analysis, after the news was released, GLSI’s stock price fluctuated significantly in after-hours trading. Analysts pointed out that the key validation point lies in the design and patient enrollment progress of the Phase III clinical trial starting in 2024. If subsequent data can maintain the current level of efficacy, GP2 is expected to submit a Biologics License Application before 2026. JPMorgan’s latest research report highlights that GP2’s market value catalysts include details of the Phase III clinical protocol, potential partner movements, and exploration of expanding indications to other HER2-positive tumors.
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