Cross-platform comparisons of the up-modulated transcripts in ERα (+) breast carcinomas. One hundred and eighty-three genes were identified by more than one study, eleven of which were commonly identified across the three platforms. a) Comparison between SAGE and oligonucleotide microarray platforms  showing a highly significant number of overlapping genes (p < 0.001) (see table 2). b) Comparison between SAGE and cDNA microarray platforms  (p > 0.05). c) Statistically significant number of overlapping genes identified by both DNA microarrays platforms (p < 0.01).