Colorectal Carcinoma with Extremely Low CA19-9

Table 1

Clinical characteristics of clinical CA19-9 negative cases (n = 75).

Age	64.0 (29–86)
Gender (M/F)	65/42
Location
Cecum	8
Ascending	19
Transverse	5
Descending	2
Sigmoid	31
Rectum	42
TNM stage
I	31
II	32
III	27
IV	17