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Phase 3 Study to Evaluate the Efficacy and Safety of HER2/Neu Peptide GLSI-100 (GP2 + GM-CSF) in HER2/Neu Positive Subjects
Trial Status: active
This is a prospective, randomized, double-blinded, placebo-controlled, multi-center,
Phase 3 study of GLSI-100 immunotherapy in HLA-A*02 positive and HER2/neu positive
subjects who are at high risk for disease recurrence and have completed both neoadjuvant
and postoperative adjuvant standard of care therapy. Treatment consists of 6 intradermal
injections, Primary Immunization Series (PIS), over the first 6 months of treatment and 5
booster intradermal injections spaced 6 months apart. A third open-label arm will explore
GLSI-100 immunotherapy in non-HLA-A*02 positive and HER2/neu positive subjects.
Inclusion Criteria
HLA-A*02-positive, unless being enrolled in the third non-HLA-A*02 arm
Histologically confirmed diagnosis of HER2/neu positive primary breast cancer for all tumors biopsied (multifocal, multicentric, or synchronous contralateral disease)
Completion of both neoadjuvant and adjuvant trastuzumab-based standard of care breast cancer therapy
Stage I, II, or III at presentation with pathologic evidence of residual invasive carcinoma in the breast or axillary lymph nodes (residual disease) at surgery following completion of neoadjuvant therapy -OR- Stage III at presentation with pathologic complete response (pCR) at surgery following completion of neoadjuvant therapy
The subject can begin study therapy within one year of completion of adjuvant trastuzumab-based therapy and any other standard therapies, but, study therapy can be administered concurrently with endocrine therapy.
No clinical evidence of residual or persistent breast cancer per treating physician assessment
ECOG 0-2
Adequate organ function
Negative pregnancy test or evidence of post-menopausal status
If of childbearing potential, willing to use a form of highly effective contraception
Subject must both reside in and have been treated for their cancer in the country in which the clinical site is located.
Exclusion Criteria
Stage IV cancer or metastatic breast cancer at any time
Inflammatory breast cancer
Receiving other investigational agents
Receiving chemotherapy
Requiring long-term systemic treatment with corticosteroids or other immunosuppressive therapy
History of immunodeficiency or active autoimmune disease
A history of serious allergic reactions, including anaphylaxis, to human granulocyte-macrophage colony-stimulating factors such as sargramostim, yeast-derived products, or any component of the investigational product
Other malignancies except adequately treated in situ carcinoma of the cervix or basal cell or squamous cell carcinoma of the skin
Active infection
Known HIV infection with a detectable viral load within 6 months of the anticipated start of treatment. Note: Subjects on effective antiretroviral therapy with an undetectable viral load within 6 months of the anticipated start of treatment are eligible for this trial.
Additional locations may be listed on ClinicalTrials.gov for NCT05232916.
