Fig. 3

Kaplan–Meier subgroup progression-free survival analysis. There was a statistically significant difference in the progression-free survival rate between the concave-shaped filling defects and the no filling defects groups (log-rank P < 0.0001), as well as between the concave-shaped filling defects and convex-shaped filling defects groups (log-rank P < 0.0085). However, no statistically significant difference in progression-free survival was observed between the convex filling defects group and the no filling defects group (log-rank P = 0.2807)