Fig. 3

OS in various subgroups of independent significant factors. OS, overall survival. a. Comparison of OS between pCT alone and POCRT in patients with squamous cell carcinoma before matching. b. Comparison of OS between pCT alone and POCRT in patients with squamous cell carcinoma after matching. c. Comparison of OS between pCT alone and POCRT in patients with without lymphovascular invasion before matching. d. Comparison of OS between pCT alone and POCRT in patients with without lymphovascular invasion after matching. e. Comparison of OS between pCT alone and POCRT in patients with ≤7 MLNs before matching. f. Comparison of OS between pCT alone and POCRT in patients with ≤7 MLNs after matching. g. Comparison of OS between pCT alone and POCRT in patients with pN2a before matching. h. Comparison of OS between pCT alone and POCRT in patients with pN2a after matching. OS, overall survival; pCT, postoperative chemotherapy; POCRT, postoperative chemoradiotherapy; scc, squamous cell carcinoma; non-vessel invasion, without lymphovascular invasion; MLNs≤7, metastatic lymph nodes≤7; pN2a, Combine pN2a1 and pN2a2, N2 at a single station without N1 involvement (‘skip’ metastasis, N2a1), N2 at a single station with N1 involvement (N2a2)