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Flow chart of the study plan. TCGA: The Cancer Genome Atlas; TICs: tumor-infiltrating immune cells; K-M: Kaplan-Meier; ROC: receiving operating characteristic; PCA: principal coordinate analysis; GO: Gene Ontology; KEGG: Kyoto Encyclopedia of Genes and Genomes; PPI: protein-protein interaction; HNSCC: head and neck squamous cell carcinoma, DCA: decision curve analysis.
