Mucinous adenocarcinoma: A unique clinicopathological subtype in colorectal cancer

Table 1 Clinicopathological characteristics of patients with mucinous adenocarcinoma or non-mucinous adenocarcinoma in China, USA and Germany[6,24,25]

	China			USA			Germany
	MAC (%)	NMAC (%)	P	MAC (%)	NMAC (%)	P	MAC (%)	NMAC (%)	P
Age(yr)	21.4% (< 50)	11.3% (< 50)	0.005	62.6% (> 65)	56.3% (> 65)	< 0.001	67 (25-88)	65 (15-96)	0.037
Gender			0.603			< 0.001			0.034
Male	58.1	55.4		47.9	51.4		52.8	58.5
Female	41.9	44.6		52.1	48.6		47.2	41.5
Tumor location			< 0.001			< 0.001			< 0.001
Right hemicolon	35.0	18.9		65.3	46.2		51.5	27.5
Left hemicolon	23.9	30.4		24.8	36.2		18.9	29.8
Rectum	41.0	50.7		9.9	17.6		27.5	40.1
Tumor size (cm)			< 0.001			< 0.001			-
≤ 5	34.2	54.2		48.93	68.34		-	-
> 5	65.8	45.8		51.07	31.66		-	-
Primary tumor (T)			0.001			< 0.001			< 0.001
T1, T2	28.2	44.5		13.8	26.5		13.3	30.5
T3, T4	71.8	55.4		86.2	73.5		86.7	69.5
Regional lymph nodes (N)			< 0.001			< 0.001			0.018
N0	35.9	55.0		52.5	57.0		49.1	55.6
N1, N2	64.0	45.0		47.5	43.0		50.9	44.4
Distant metastasis (M)			0.001			0.004			< 0.001
M0	56.4	72.4		84.7	85.8		75.5	78.5
M1	43.6	27.6		15.3	14.2		24.5	21.5
Stage			0.001			< 0.001			< 0.001
Ⅰ, Ⅱ	28.2	44.5		21.5	31.2		44.8	52.0
Ⅲ, Ⅳ	71.8	55.5		78.5	68.8		55.2	48.0
Histological grading			< 0.001			< 0.001			< 0.001
G1, G2	82.9	89.8		76.4	80.1		55.2	69.6
G3, G4	17.1	10.1		23.6	19.9		44.8	30.4

P value of the χ² test was used to compare the NMAC and MAC groups. MAC: mucinous adenocarcinoma; NMAC: nonmucinous adenocarcinoma.