PSMD14 and head and neck squamous cell carcinoma: The results of IHC confirmed that the protein expression of PSMD14 was much higher in low-grade dysplasia (Week 24) and high-grade dysplasia/carcinoma (Week 28) than that in normal tissue (Week 16) (Figure 2D), indicating that PSMD14 may be implicated in HNSCC tumorigenesis.