Patent No. 594479 Disclosed is the use of an inhibitor of expression and/or activity of a tumor antigen for the preparation of a pharmaceutical composition for treating or preventing a tumor disease, wherein said tumor antigen comprises an amino acid sequence encoded by a nucleic acid which comprises the nucleic acid sequence according to SEQ ID NO: 1 of the sequence listing or a variant of said nucleic acid sequence, wherein (i) the inhibitor of expression of a tumor antigen is an inhibitory nucleic acid selectively hybridizing to the nucleic acid which comprises the nucleic acid sequence according to SEQ ID NO: I of the sequence listing or a variant of said nucleic acid sequence, or (ii) the inhibitor of activity of a tumor antigen is an antibody specifically binding to said tumor antigen, wherein said variant is a functional variant and said tumor disease is a cancer of the stomach, a gastric cancer, a gastric carcinoma, an adenocarcinoma of the stomach or a metastasis thereof.
