Identification of patients at-risk for Lynch syndrome in a hospital-based colorectal surgery clinic

Table 3 Features of the 223 colorectal tumors in the 212 probands¹

Feature	n (%)
Tumor site
Ascending colon	22 (9.9)
Transverse colon	12 (5.4)
Descending colon	11 (5.0)
Rectosigmoid	158 (71.1)
Other (cecum, unspecified site)	19 (8.6)
Total	222 (100.0)
Missing data	1
Differentiation
Well differentiated	20 (10.0)
Moderately differentiated	157 (78.1)
Poorly differentiated	24 (11.9)
Total	201 (100.0)
Missing data	22
Mucinous feature	15 (6.7)
Total	223 (100.0)
Missing data	0
MSI-high phenotype2	42 (21.3)
Total	197 (100.0)
Missing data	26
Dukes stage (n = 195)
A	6 (3.1)
B	76 (39.0)
C	87 (44.6)
D	26 (13.3)
Total	195 (100.0)
Missing data	28

¹Cases with missing data were excluded from the analysis;

²Cases included all patients with microsatellite instability-high phenotype, independent of age.