TM4SF1 and neoplasm: Peptide 5 is a TM4SF1 CTL (cytotoxic CD8 T-cell) epitope and may induce T-cell reactions after DNA immunization and increase peptide-specific cytotoxic T cells (CD107a+, CD8+), thus inhibiting the growth of EL4/TM4SF1/HLA-A2 tumor cells in A2 Tg mice.