Phase 3 Study of GLSI-100 Immunotherapy in HER2Neu Positive Breast Cancer Patients After Standard Trastuzumab-based Therapy Evaluating Safety and Effectiveness in High-Risk or Residual Disease Cases

What this Trial Is About

This research investigates GLSI-100 immunotherapy in people with HER2neu positive breast cancer who are at high risk for their cancer returning. It focuses on participants who have completed both neoadjuvant and postoperative adjuvant standard treatments. The study is Phase 3, randomized, double-blinded, and placebo-controlled, involving subjects who are HLA-A*02 positive as well as an open-label group of non-HLA-A*02 positive subjects. The goal is to evaluate the treatments impact on invasive breast cancer-free survival over a median follow-up of 4 years. Participants receive 6 primary immunization injections of GLSI-100 or placebo intradermally once a month for the first 6 months, followed by 5 booster injections spaced 6 months apart, totaling 11 injections over 3 years. There are three groups one receiving placebo 0.9% normal saline, one receiving GLSI-100 immunotherapy in HLA-A*02 positive subjects, and an open-label arm for non-HLA-A*02 positive subjects receiving GLSI-100 under the same schedule. During the study, participants undergo regular monitoring and assessments including invasive disease-free survival, distant disease-free survival, overall survival, and quality of life questionnaires at baseline and up to 36 months. Researchers track safety and treatment effects over a median 4-year follow-up. The study continues until December 2031, aiming to provide comprehensive data on long-term outcomes and quality of life for participants receiving these treatments.

Phase 3 Study to Evaluate the Efficacy and Safety of HER2/Neu Peptide GLSI-100 (GP2 + GM-CSF) in HER2/Neu Positive Subjects