According to the instructions, the tissue was subject to baking, dewaxing, hydrating, antigen retrieval, primary antibody incubation, washing, secondary antibody incubation, dehydrating, etc. The expression of STAT3 protein was stronger in gastric cancer and adjacent tissues under the microscope, and the expression of STAT3 protein in gastric cancer tissue is slightly stronger than that in adjacent tissues, as shown in Figure 2. Here, STAT3 is linked to gastric cancer.