Fig. 3.

Kaplan-Meier curve analyses of patients with anal squamous cell carcinoma, treated between April 2012 and May 2023, showing survival after surgery, concurrent chemoradiotherapy (CRT), or CRT plus immunotherapy (CRT-I). Curves show comparisons of rates, by type of treatment, for all 100 study patients, of (A) overall survival (P = 0.280), (B) progression-free survival (P < 0.001), (C) distant metastasis-free survival (P = 0.002), and (D) locoregional relapse-free survival (P < 0.001). Symbols represent treatment comparisons between two groups: Numbers of symbols indicate P-value levels: ns indicates not significant, ‘*’ means P < 0.05, ‘**’ means P < 0.01 and ‘***’ means P < 0.001.