Table 1. Baseline patient characteristics and histopathological findings.

Characteristics	Value
Total patients	59
Age (years)
≤ 60	42(71.2%)
> 61	17(28.8%)
Primary mass location(from anal verge)
0–5 cm	27(45.8%)
5.1–10 cm	29(49.2%)
10.1–15 cm	3(5.0%)
pre-nCRT clinical T stage
T3	37(62.7%)
T4	22(37.3%)
pre-nCRT clinical N stage
N0	11(18.6%)
N+	48(81.4%)
post nCRT TRG group
TRG1-2	30(50.8%)
TRG3-5	29(49.2%)
ypT stage
T0	16(27.1%)
T1	1(1.7%)
T2	11(18.6%)
T3	30(50.9%)
T4	1(1.7%)
ypN stage
N0	15(25.4%)
N+	44(74.6%)

TRG indicates tumor regression grade; nCRT, neoadjuvant chemoradiotherapy; ypT/N stage, therapy pathological T/N stage.