Different types of tumor microvessels in stage I-IIIA squamous cell lung cancer and their clinical significance

Figure 4 Disease-free survival curves according to the independent predictors of lung squamous cell carcinoma recurrence risk (log-rank test). A and B: Tumor grade; C and D: N stage; E and F: Loose, fine fibrous connective tissue; G and H: Fragmentation of the tumor solid component; I and J: Tumor spread through the alveolar air spaces; K and L: Odds ratio sum (ORS) ≤ 12.11 or ORS > 12.11. A, C, E, G, I and K: Recurrence free survival (RFS) curves for the main cohort of patients; B, D, F, H, J and L: RFS curves for the training cohort of patients. ^aP < 0.05, ^bP < 0.01, ^cP < 0.001, ^dP < 0.0001.