highly significantP = 0.007
For T4 lesions, the range was 1–4 cm with 49% of MUs performing a 2-cm margin (with highly significant differences between groups: 52% of AMs, 15% of PMs and 42% of FMUs, P = 0.007), 90% of MUs from 2 to 4 cm (38% of the AMs, 40% of PMs, and 53% of FMUs).