Table 2
Cytokeratin 20 (CK20) PCR of blood samples of patients with colorectal cancer
Number of positive tests out of four CK20 PCRs/sample
Stage
0
1
2
3
4
Positive/total patients
Stage II
10
3
2
0
0
5/15
Stage III
7
3
0
0
0
3/10
Stage IV
4
0
0
1
0
1/5