PLOD1 and head and neck squamous cell carcinoma: In both the overall (OS) and disease specific survival (DSS) analyses, PLOD expression was shown to be closely associated with poor prognosis in HNSCC with these evaluations determining a hazard ratio range of 1.51 (PLOD1) to 1.78 (PLOD2) (Fig. 2A and B, all p < 0.01).