EGFR and central nervous system cancer: CiteSpace generated 8 clusters: cluster 0 for lower-grade glioma, cluster 1 for lung cancer histology, cluster 2 for lung adenocarcinoma, cluster 3 for breast cancer, cluster 4 for radiation-induced lung injury, cluster 5 for epidermal growth factor receptor (EGFR) mutation, cluster 6 for late radiotherapy toxicity, and cluster 7 for artificial intelligence.