FAT1 and head and neck squamous cell carcinoma: FAT1 signature (FAT1‐HR vs. FAT1‐LR subgroup), age (> 60 years vs. ≤ 60 years), and advanced T stage (T3 and T4 vs. T1 and T2) were independent prognostic factors of OS in patients with HNSCC (P = 0.025, 0.0494, and 0.0264, respectively; Table S3).