GSTM1 and squamous cell carcinoma: WBC: white blood cell; RBC: red blood cell; Hb: hemoglobin; Plt: platelet; ALP: alkaline phosphatase; AST: aspartate aminotransferase; ALT: alanine aminotransferase; γ-GTP: γ-glutamyl transpeptidase; LDH: lactate dehydrogenase; Na: sodium; K: potassium; Cl: chloride; Ca: calcium; Crea: creatinine; BUN: blood urea nitrogen; TP: total protein; Alb: albumin; T-Bil: total bilirubin; CRP: C-reactive protein; SCC: squamous cell carcinoma; CEA: carcinoembryonic antigen