Table 1.

Numbers of circulating tumor cells relative their age, for individual subjects. 1 to 10 circulating tumor cells per 7.5 ml blood sample in 107 individuals out of the 3388 screened.

Age	Total number pat	1 CTC	2 CTC	3 CTC	4 CTC	≥5 CTC	Number of CTC pos pat	%
45–49	699	6	12	3	3	2	26	3.72
50–54	734	3	12	4	4	2	25	3.41
55–59	674	1	7	6	1	1	16	2.37
60–64	518	2	10	3	1	1	17	3.28
65–69	374	0	8	1	0	1	10	2.67
70–74	230	0	4	3	0	1	8	3.48
75–80	159	0	4	0	0	1	5	3.14
	3388	12	57	20	9	9	107	3.16