Fig. 2

Kaplan-Meier analyses of oncologic outcomes. The oncologic outcomes of patients who did (cx+) or did not (cx-) receive chemotherapy were compared (red curve: cx + group, black curve: cx- group). a–c outcomes before propensity-score matching (n = 316); d–f outcomes after propensity-score matching (n = 152). Triangles indicate the censored cases. a The overall survival of patients with/without chemotherapy before propensity-score matching. b The local control rate of patients with/without chemotherapy before propensity-score matching. c The distant progression-free survival of patients with/without chemotherapy before propensity-score matching. d The overall survival of patients with/without chemotherapy after propensity-score matching. e The local control rate of patients with/without chemotherapy after propensity-score matching. f The distant progression-free survival of patients with/without chemotherapy after propensity-score matching