Optimal postoperative surveillance strategies for stage III colorectal cancer

Figure 1 Number of imaging studies during surveillance period based on the development of recurrence. A: Mean number of abdomino-pelvic computed tomography (APCT) and chest computed tomography (CCT) studies were higher in the recurrence group (APCT, 2.63 ± 1.64 vs 1.77 ± 0.66; CCT, 1.27 ± 1.24 vs 0.91 ± 0.49; P < 0.001, each); B: In patients with intra-abdominal recurrence, mean number of APCT studies were higher in the recurrence group (APCT, 2.75 ± 1.79 vs 1.85 ± 0.79, P < 0.001; CCT, 1.09 ± 1.13 vs 1.00 ± 0.71, P = 0.060); C: In patients with intra-thoracic recurrence, mean number of APCT and CCT studies were higher in the recurrence group (APCT, 2.41 ± 1.21 vs 1.97 ± 1.09; CCT, 1.58 ± 1.34 vs 0.93 ± 0.66; P < 0.001, each). APCT: Abdomino-pelvic computed tomography; CCT: Chest computed tomography.

Figure 2 Kaplan–Meier analyses of recurrence-free interval according to surveillance intensity. Recurrence-free interval was significantly longer in low intensity group.

Figure 3 Kaplan–Meier analyses of post-recurrence survival according to surveillance intensity. Surveillance intensity did not show difference in post-recurrence survival.

Figure 4 Kaplan–Meier analyses of overall survival according to surveillance intensity. High intensity group had lower overall survival rate than low intensity group.