Pure Well-Differentiated Adenocarcinoma Is a Safe Factor for Lymph Node Metastasis in T1 and T2 Colorectal Cancer: A Pilot Study

Table 6

A multicenter review analyzing 72 T1 cancers with LNM.

Case number	72
Age, years; mean (range)	64.7 (27–83)
Sex (male/female) %, (n)	50.0 (36)/50.0 (36)
Tumor size, mm; mean (range)	21.0 (5–55)
Location (colon/rectum) %, (n)	55.6 (40)/44.4 (32)
Morphology (polypoid/nonpolypoid) %, (n)	48.6 (35)/51.4 (37)
SM invasion distance, μm; mean (range)	4158.7 (850–11,000)
SM invasion (T1a/T1b) %, (n)	2.8 (2)/97.2 (70)
Lymphatic invasion positive %, (n)	45.8 (33)
Venous invasion positive %, (n)	36.1 (26)
Lymphatic or venous invasion positive %, (n)	63.9 (46)
Budding grade 2/3%, (n)	22.2 (16)
Poor or mucinous histology %, (n)	45.8 (33)
PWDA %, (n)	0.0 (0)

LNM: lymph node metastasis; PWDA: pure well-differentiated adenocarcinoma.