Table 1.

Frequency of CTC in 7.5 mL of blood from normal donors: patients with benign disease and metastatic breast, colorectal, and prostate cancer patients before initiation of a new line therapy.

	Percentage of patients with CTC above threshold
	# pat	≥1	≥5	≥10	≥50	≥100	≥500	≥1000
Normal	295	3.4	0.0	0.0	0.0	0.0	0.0	0.0
Benign	255	7.5	0.4	0.4	0.0	0.0	0.0	0.0
Breast	177	70.6	49.7	38.4	20.9	15.8	3.4	2.8
Colorectal	413	47.5	18.2	11.6	2.4	1.0	0.0	0.0
Prostate	218	77.5	57.3	45.0	20.6	13.8	3.7	2.3