Table 3. Ratio of HER-2 gene amplification of primary tumor and corresponding CTCs.

	Ratio HER-2/CEP 17
Patient no.	Tumor	CTCs
1	13.60	4.0
2	9.00	2.5
3	6.46	2.5
4	5.01	3.4
5	3.47	2.6
6	6.00	3.4
7	7.16	2.0
8	5.01	2.7
10	5.67	2.1
11	5.00	2.3
Mean ± SD	6.64 ± 2.86	2.8 ± 0.7