Figure 4. Correlation between risk score and clinical characteristics. (A) The distribution of clinical characteristics between high- and low-risk groups. (B) The difference of risk score between Age ≤65 and Age >65, (C) different gender, (D) smoking and non-smoking, (E) tumor size, (F) with and without lymph node metastasis, (G) with and without distance metastasis, (H) different TNM stage. **P < 0.01.