Fig. 3From: A prognostic model for stratification of stage IB/IIA esophageal squamous cell carcinoma: a retrospective studya Correlation between TNM stage and the number of lymph nodes (NLNs) (one-way ANOVA test); b Correlation between TNM stage and PD-L1 expression (one-way ANOVA test); C. Correlation between NLNs and PD-L1 expression (linear regression and Pearson’s correlation analysis)Back to article page