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Twenty two surgical specimens of gastric cancer resected after administration of OK-432 for the skin reaction test were examined to determine whether the cancer cells had the same antigens as OK-432, a product of hemolytic streptococcus cells. When the tissues were stained by the PAP method with anti-Su streptococcus antibody used as the primary antibodies, the common antigens were demonstrated in 10 (45.5%) of the 22. The presence or absence of the common antigens was independent of the degree of skin reaction to OK-432, and the relations of the common antigens to other host responses were not clear in this study. This is the first report for the presence of such common antigens between human gastric cancer and OK-432.

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