LETM1 and head and neck squamous cell carcinoma: LETM1 expression levels were not related to gender (P = 0.545), age (P = 0.466), primary site of tumor (P = 0.764), pT (P = 0.334), alcohol use history (P = 0.168), and smoking status of patients with HNSCC (P = 0.328) (Table 2).