These words were classified into 11 large clusters (Figure 7): “exosome,” “invasion,” “chemoresistance,” “glycolysis,” “liver fibrosis,” “egfr,” “heih,” “pvt1,” “dna methylation,” “wnt,” “inflammation,” and “laryngeal squamous cell carcinoma.” This timeline view (Figure 7) visualized the most important keywords in a specific field and showed the emergence, popularity, and decline of the research topic. The gene discussed is PVT1; the disease is laryngeal squamous cell carcinoma.