Invasive micropapillary carcinoma: A distinct type of adenocarcinomas in the gastrointestinal tract

Table 3 Characteristics of study group diagnosed with colorectal invasive micropapillary carcinoma

Parameter	Kim et al[20], 2006	Haupt et al[32], 2007	Xu et al[44], 2009	Verdú et al[10], 2011	Lino-Silva et al[42], 2012
No. of patients	55	34	30	60	15
Mean age, yr	64	66	57	65.8	56
Sex	F-15	F-15	F-13	F- 23	F-8
	M-40	M-19	M-17	M-37	M-7
Location
Colon	33	30	12	24	15
Rectum	22	2	18	36	0
Unspecified	0	2	0	0	0
Percentage of IMPC	5%-80%	5%-60%	5%-75%	5%-30%	10%-80%
Adenocarcinoma type
Nonmucinous	55	29	29	57	15
Mucinous	0	5	1	3	0
Grade of malignancy (G)
G1	5	1	13	23	0
G2	43	26	0	30	0
G3	7	7	0	7	6
G4	0	0	17	0	9
pT stage (T)
T1	2	3	0	3	0
T2	4	5	5	9	0
T3	45	24	25	38	9
T4	4	2	0	10	6
Lymphovascular invasion	Yes-25	Yes-14	Yes-10	Yes-28	Yes-5
(LV) (Yes/No)	No-30	No-20	No-20	No- 32	No-10
Lymph node metastasis (N)	Yes-41	Yes-25	Yes-19	Yes- 38	Yes-15
(Yes/No)	No-14	No-9	No-11	No-12	No-0
Distant metastasis (M)	Yes-13	Yes-4	Yes- 1	Yes-10	Yes-3
(Yes/No)	No-42	No-30	No-29	No-50	No-12
Correlations	N, M, TNM stage	N	G, N, TB	T, TNM stage, N,M, VI, PI	G, N, TNM stage

PD: Predominant; ND: No data; M: Male; F: Female; VI: Venous vessel invasion: PI: Perineural invasion.