EGFR and pancreatic neoplasm: The fourth quadrant (basic themes) contained two clusters, cluster one included “pancreatic cancer”, “nanoparticle”, “drug delivery system”, “gemcitabine”, “nanomedicine”, “cancer”, “cancer therapy”, “liposome”, “targeted drug delivery”, and “chemotherapy”; cluster two included “magnetic nanoparticle”, “mesoporous silica nanoparticle”, “photodynamic therapy”, “magnetic resonance imaging”, “photothermal therapy”, “theranostics”, “nanomaterial”, “active targeting”, “EGFR”, and “cisplatin”.