The specimens were sliced into 4 μm sections, covered with paraffin, and stored at 4°C until immunohistochemistry was performed. The immunohistochemistry procedure was based on our previous study (15 (link)) with slight modifications. The immunohistochemistry kit was obtained from Zhongshan Golden Bridge Biotechnology, Beijing, Co., Ltd., and included 3% H2O2, normal goat serum for blocking streptavidin marked with horseradish peroxidase, and diaminobenzidine reaction agent. The sodium citrate antigen retrieval solution was acquired from Beijing Solarbio Science & Technology Co., Ltd. The polyclonal antibody against LIGHT was acquired from Sigma-Aldrich (HPA012700) and was applied at a concentration of 1:50.
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