Table 3
Cytokeratin 20 (CK20) PCR of bone marrow samples of patients with colorectal cancer
Number of positive tests out of four CK20 PCRs/sample
0
1
2
3
4
Positive/total patients
Stage II
3
4
2
0
0
6/9
Stage III
7
0
0
0
0
0/7
Stage IV
0
2
1
0
0
3/3