ALDH1A1 and neoplasm: The expression of SOX2 was significantly correlated with pathological grade (G I and G III, P < 0.05) but not with tumor stage (T1–T3) and lymph node status (N0 and N1 + N2, P > 0.05); ALDH1 was significantly correlated with tumor stage (T1–T3) and pathological grade (G I–G III, P < 0.05) but not with lymph node status (N0 and N1 + N2, P > 0.05); and CD44 was not significantly correlated with either the tumor stage (T1 to T3), pathological grade (G I–III), or lymph node status (P > 0.05).