MAGE-A1-derived peptide acetate is a short peptide sequence originating from the MAGE-A1 protein. As a tumor-specific antigen, it can be recognized and activated by cytotoxic T lymphocytes (CTLs), inducing an immune response against tumor cells expressing MAGE-A1. This immune reaction can result in the lysis and death of tumor cells. MAGE-A1-derived peptide acetate is utilized in tumor immunology research.