Table 4.

Liver cancer studies

Data set	D1	D2	D3	D4
Experimenter	Hospital A	Hospital B	Hospital C	Hospital C
Tumor	16 (14)	23	29	12 (10)
Normal	16 (14)	23	5	9(7)
Chip type	cDNA(Version 1)	cDNA(Version 1)	cDNA(Version 1)	cDNA(Version 2)
(Cy5:Cy3)	Sample:normal liver	Sample:placenta	Sample:placenta	Sample:sample

Tumor: number of tumor samples. Normal: number of normal samples. Numbers in the “()” are the number of subjects used in analysis. Version 2 chips have different spot locations from Version 1 chips.