NCIt definition : A recombinant 19-residue peptide vaccine consisting of amino acids 161 through 180
of the cancer/testis (CT) antigen. ESO-1 (161-180) peptide vaccine may stimulate the
host immune system to mount a cytotoxic T lymphocyte (CTL) response against tumor
cells positive for ESO-1, resulting in decreased tumor growth. ESO-1 is expressed
in a variety of cancers, including melanoma, breast, bladder, prostate, and hepatocellular
cancers. (NCI04);