Table 1. Patient demographics.

Parameter	Number
Total cases (n)	311
Age (years)
Median age	61
Interquartile range	31–89
Gender, n (%)
Female	225 (72.3)
Male	86 (27.7)
Location of primary tumor, n (%)
Anus	117 (56.9)
Anal canal	92 (29.6)
Anorectum	16 (5.1)
Overlapping lesion of rectum, anus, anal canal	10 (3.2)
Rectum	7 (2.3)
Anorectal junction	6 (1.9)
Skin of anus	1 (0.3)
Perianal skin	1 (0.3)
Cloacagenic zone	1 (0.3)
Specimen site, n (%)
Local	210 (67.5)
Distant metastasis	101 (32.5)