Table 2. Comparison of the chemotherapy efficacy according to CTC counts.

	Relative low CTC level (n=27)	High CTC level (n=40)	P value
Radiological response
Complete response	0	0
Partial response	11	15
Stable disease	8	10
Progressive disease	4	11
Undefined	4	4
Clinical response rate
Objective response rate	11 (40.7%)	15 (37.5%)	0.969
Disease control rate	19 (70.4%)	25 (62.5%)	0.506