Racial differences in the anatomical distribution of colorectal cancer: a study of differences between American and Chinese patients

Table 1 Histological diagnosis of patients with colorectal cancer

	No of patients (%)
	White	Oriental
Adenocarcinoma	664 (96.2)	816 (93.8)
Nonadenocarcinoma	26 (3.8)	54 (6.2)
Total	690 (100.0)	870 (100.0)

Table 2 Anatomic subsite distribution of colorectal cancer by race

	Men				Women				Total
	White		Oriental		White		Oriental		White		Oriental
	n	%	n	%	n	%	n	%	n	%	n	%
Cecum	57	8.6	14	1.7c	50	7.5	16	2.0c	107	16.1	30	3.7c
Ascending	45	6.8	31	3.8a	32	4.8	29	3.6	77	11.6	60	7.4b
Hepatic flexure	5	0.8	27	3.3c	2	0.3	26	3.2c	7	1.1	53	6.5c
Transverse	27	4.1	20	2.5	13	1.9	25	3.0	40	6.0	45	5.5
Splenic flexure	8	1.2	17	2.1	2	0.3	7	0.8	10	1.5	24	2.9
Descending	20	3.0	9	1.1a	11	1.7	7	0.9	31	4.7	16	2.0b
Sigmoid	63	9.5	82	10.0	54	8.1	64	7.9	117	17.6	146	17.9
Rectum	172	25.9	249	30.5c	103	15.5	193	23.7c	275	41.1	442	54.2c
Proximal	142	21.4	109	13.6c	99	14.9	103	12.6a	241	36.3	212	26.0c
Distal	255	38.4	340	41.7c	168	25.3	264	32.3a	423	63.7	604	74.0c
Total	397	59.8	449	55.0	267	44.2	367	45.0	664	100.0	816	100.0

^aP < 0.05,

^bP < 0.01,

^cP < 0.001.

Table 3 Anatomic subsite distribution of colorectal cancer by race and time

Time		Proximal			Distal			Total
		Man	Woman	Ratio	Man	Woman	Ratio	Man	Woman	Ratio
1990-1995	White	51	43	1.19	106	72	1.47	157	115	1.37
	Yellow	55	49	1.12	163b	128a	1.27	218b	177	1.23
1996-2000	White	91	56	1.63	149	96	1.55	240	152	1.58
	Yellow	54c	54a	1.00	177	136	1.30	231b	190	1.22
Total	White	142	99	1.43	255	168	1.52	397	267	1.49
	Yellow	109c	103a	1.06	340c	264a	1.29	449	367	1.22

^aP < 0.05,

^bP < 0.01,

^cP < 0.001.