ALB and esophageal squamous cell carcinoma: As shown in Figure 3B, these keywords formed 11 clusters: #0 drug delivery, #1 human serum albumin, #5 human serum albumin nanoparticles, and #6 bovine serum albumin nanoparticles can be classified under comprehensive evaluation; #2 breast cancer, #3 lung cancer, #4 cancer therapy, #8 pancreatic cancer, and #9 esophageal squamous cell carcinoma can be classified under clinical application; and #7 photodynamic therapy and #10 multimodal therapy can be classified under multifunctional NPs and combination therapy.