Self-expanding metal stent placement and pathological alterations among obstructive colorectal cancer cases

Table 4 Pathological features of patients with colorectal cancer according to decompression methods in strata of American Joint Committee on Cancer-pT stage or tumor location

Characteristic1	All cases (n = 102)	Decompression methods		P value2,3
		Transanal tube (n = 76)	SEMS (n = 26)
Lymphatic invasion
AJCC-pT2/T3 cases, n (%)				0.024 (0.036)
Absent	8 (12)	8 (15)	-
Minimal	31 (46)	25 (46)	6 (43)
Moderate	20 (29)	17 (31)	3 (21)
Severe	9 (13)	4 (7.4)	5 (36)
AJCC-pT4 cases, n (%)				0.53 (0.56)
Absent	3 (8.8)	2 (9.1)	1 (8.3)
Minimal	10 (29)	8 (36)	2 (17)
Moderate	12 (35)	6 (27)	6 (50)
Severe	9 (26)	6 (27)	3 (25)
Venous invasion
AJCC-pT2/T3 cases, n (%)				0.0031 (0.0025)
Absent	13 (19)	12 (22)	1 (7.1)
Minimal	37 (54)	32 (59)	5 (36)
Moderate	12 (18)	9 (17)	3 (21)
Severe	6 (8.8)	1 (1.9)	5 (36)
AJCC-pT4 cases, n (%)				0.0077 (0.042)
Absent	6 (18)	5 (23)	1 (8.3)
Minimal	8 (24)	5 (23)	3 (25)
Moderate	11 (32)	10 (45)	1 (8.3)
Severe	9 (26)	2 (9.1)	7 (58)
Lymphatic invasion
Cecum to transverse colon cases, n (%)				0.21 (0.088)
Absent	3 (19)	3 (23)	-
Minimal	7 (44)	6 (46)	1 (33)
Moderate	4 (25)	4 (31)	-
Severe	2 (13)	-	2 (67)
Descending to rectum, n (%)				0.40 (0.096)
Absent	8 (9.3)	7 (11)	1 (4.4)
Minimal	34 (40)	27 (43)	7 (30)
Moderate	28 (33)	19 (30)	9 (39)
Severe	16 (19)	10 (16)	6 (26)
Venous invasion
Cecum to transverse colon cases, n (%)				0.10 (0.078)
Absent	5 (31)	5 (38)	-
Minimal	6 (38)	5 (38)	1 (33)
Moderate	2 (13)	2 (15)	-
Severe	3 (19)	1 (7.7)	2 (67)
Descending to rectum, n (%)				0.0001 (0.0012)
Absent	14 (16)	12 (19)	2 (8.7)
Minimal	39 (45)	32 (51)	7 (30)
Moderate	21 (24)	17 (27)	4 (17)
Severe	12 (14)	2 (3.2)	10 (43)

¹Percentage indicates the proportion of patients with a specific clinical characteristic among all patients or in strata of decompression methods.

²We used the chi-square test to compare as categorical variables. We adjusted the two-sided α level to 0.05.

³We used the Mann-Whitney U test to compare as nonparametric continuous variables. We adjusted the two-sided α level to 0.05.

AJCC: American Joint Committee on Cancer; SEMS: Self-expanding metal stent.