Biomarkers, Tumor/genetics; Carcinoma/genetics; Gene Expression; Laryngeal Neoplasms/genetics; Neoplasm Recurrence, Local/genetics; Protein Kinase C/genetics; Adult; Aged; Aged, 80 and over; Angiotensin-Converting Enzyme 2; Carcinoma/diagnosis; Carcinoma/mortality; Carcinoma/surgery; Disease-Free Survival; Female; Gene Expression Profiling; Humans; Laryngeal Neoplasms/diagnosis; Laryngeal Neoplasms/mortality; Laryngeal Neoplasms/surgery; Larynx/metabolism; Larynx/pathology; Larynx/surgery; Longitudinal Studies; Male; Membrane Proteins/genetics; Middle Aged; Neoplasm Recurrence, Local/diagnosis; Neoplasm Recurrence, Local/mortality; Neoplasm Recurrence, Local/surgery; Peptidyl-Dipeptidase A/genetics; Prognosis; Proportional Hazards Models; Reverse Transcriptase Polymerase Chain Reaction