In addition, the cluster related to prognosis, biomarker, immunohistochemistry, lymph node metastasis, and overall survival was positioned in the basic themes field; the cluster related to meta-analysis, polymorphism, P53, gastric cancer, and single nucleotide polymorphism was positioned in the emerging or declining themes field; the cluster related to chemotherapy, cisplatin, immunotherapy, EGFR, and docetaxel was positioned in the niche themes field (Figure 7D). This evidence concerns the gene EGFR and metastatic malignant neoplasm in the lymph nodes.