The present invention relates to methods for the diagnosis and treatment of cancer in mammals, in particular gastric cancer, based on the new target AVL9. The present invention thus relates to diagnostic methods and related components to be used in such methods. Furthermore, the present invention relates to the treatment of cancer in mammals, in particular gastric cancer, based on AVL9 as a target. Specifically, the present invention relates to the immunotherapy of cancer using AVL9 tumor-associated cytotoxic T cell (CTL) peptide epitopes, alone or in combination with other tumor-associated peptides, and respective pharmaceutical composi-tions, in particular vaccine compositions.本發明涉及基於新靶標AVL9的哺乳動物癌症診斷和治療方法,特別是胃癌。因此,本發明涉及這些方法中所用的診斷方法和相關組成元素。此外,本發明涉及基於新靶標AVL9治療哺乳動物的癌症,特別是胃癌。具體來說,本發明還涉及單獨使用或與其他腫瘤相關肽聯合使用的AVL9腫瘤相關細胞毒性T細胞(CTL)肽表位、以及各藥物組合物(特別是疫苗組合物)對癌症進行的免疫療法。(無元件符號說明)