NQO1 and non-small cell lung carcinoma: The patients with NQO1 positive expression had lower OS rates compared with those with NQO1 negative expression in the groups of T1-2 (Log-rank = 9.931, P = 0.002), T3-4 (Log-rank = 9.387, P = 0.002) (Figure 4A & B), without LN metastasis (Log-rank = 9.274, P = 0.002) and stage I-II of NSCLC (Log-rank = 5.770, P = 0.016) (Figure 4C & E), however, in the groups of patients with LN metastasis or III-IV stages, OS rate was not correlated with NQO1 expression status (Log-rank = 0.919, P = 0.553 and Log-rank = 0.572, P = 0.050, respectively) (Figure 4D & F).