NCIt definition : A cancer vaccine comprised of a synthetic peptide with an amino acid sequence corresponding
to positions 154-163 of the amino acid sequence for prostate-specific antigen (PSA)
with a leucine substitution at position 155. Upon administration, PSA:154-163 (155L)
peptide vaccine may elicit a cytotoxic T-cell response against tumor cells that express
PSA. (NCI05);