Table 1. Patient demographic and clinical characteristics.

	Patient Cohort				Total
	Cohort I		Cohort II
	N	Col %	N	Col %	N	Col %
Number of patients	19	100	13	100.0	32	100.0
Gender
Male	7	36.8	2	15.4	9	28.1
Female	12	63.2	11	84.6	23	71.9
Total	19	100	13	100.0	32	100.0
Age
Under 55	9	47.4	6	46.2	15	46.9
55-69	6	31.6	6	46.2	12	37.5
70+	4	21.1	1	7.7	5	15.6
Total	19	100.0	13	100.0	32	100.0
Race
White	16	84.2	11	84.6	27	84.4
Black	3	15.8	1	7.7	4	12.5
Other	0	0	1	7.7	1	3.1
Total	19	100.0	13	100.0	32	100.0
PS
0	13	68.4	8	61.5	21	65.6
1	6	31.6	5	38.5	11	34.4
Total	19	100.0	13	100.0	32	100.0
Stage
T1-2 N0	11	57.9	4	30.8	15	46.9
T3-4 N0	6	31.6	5	38.5	11	34.4
T1-2 N1-3	1	5.3	3	23.1	4	12.5
T3-4 N1-3	1	5.3	1	7.7	2	6.3
Total	19	100.0	13	100.0	32	100.0
Prior Surgery
No	12	63.2	11	84.6	23	71.9
Yes	7	36.8	2	15.4	9	28.1
Total	19	100.0	13	100.0	32	100.0
Histology
Squamous	11	57.9	10	76.9	21	65.6
Basaloid	6	31.6	2	15.4	8	25
Other	2	10.5	1	7.7	3	9.4
Total	19	100.0	13	100.0	32	100.0
Differentiation
Well	3	33.3	0	0	3	15
Moderate	3	33.3	5	45.5	8	40
Poor	3	33.3	6	54.5	9	45
Total	9	100.0	11	100.0	20	100.0
Location of Primary
Anal Canal (AC) Only	8	42.1	4	30.8	12	37.5
AC Extending to Perianal Skin	3	15.8	2	15.4	5	15.6
AC Extending to Rectum	4	21.1	7	53.8	11	34.4
AC Extending to Perianal Skin & Rectum	2	10.5	0	0	2	6.3
Perianal Skin Only	2	10.5	0	0	2	6.3
Total	19	100.0	13	100.0	32	100.0
Vaginal Wall involvement
No	18	94.7	11	84.6	29	90.6
Yes	1	5.3	2	15.4	3	9.4
Total	19	100.0	13	100.0	32	100.0
Prostate involvement
No	19	100.0	12	92.3	31	96.9
Yes	0	0	1	7.7	1	3.1
Total	19	100.0	13	100.0	32	100.0
Inguinal LN involvement
No	16	88.9	8	72.7	24	82.8
Yes	2	11.1	3	27.3	5	17.2
Total	18	100.0	11	100.0	29	100.0