Table 1. Analysis of spiked carcinoma cells in human whole blood on a cell microarray chip.

Sample*	number of Leukocytes	spike rate	number of cells**	number of leukocytes	number of carcinoma cells	estimated spiked rate
	(/10 ml)	(%)	(/microchamber)	(/chip)	(/chip)	(%)
1	25,600,000	0.000195	89±3.1	1,860,000	4	0.000215
2	26,200,000	0.000191	90±2.7	1,880,000	4	0.000213
3	16,800,000	0.000298	87±2.2	1,820,000	5	0.000275
4	27,800,000	0.000180	89±4.2	1,860,000	3	0.000161
5	25,400,000	0.00197	89±5.2	1,860,000	38	0.00204
6	26,200,000	0.00191	87±2.3	1,820,000	37	0.00203
7	27,600,000	0.00181	89±3.7	1,860,000	34	0.00183

*Samples no. 1 to 4 were spiked with 50 carcinoma cells; and 5 to 7, were spiked with 500 carcinoma cells,

**Ten microchambers were randomly selected on a cell microarray chip, and the number of carcinoma cells in each of the chambers was counted.