Bmc Medical Genomics the Removal of Multiplicative, Systematic Bias Allows Integration of Breast Cancer Gene Expression Datasets – Improving Meta-analysis and Prediction of Prognosis

Background: The number of gene expression studies in the public domain is rapidly increasing, representing a highly valuable resource. However, dataset-specific bias precludes meta-analysis at the raw transcript level, even when the RNA is from comparable sources and has been processed on the same microarray platform using similar protocols. Here, we demonstrate, using Affymetrix data, that much of this bias can be removed, allowing multiple datasets to be legitimately combined for meaningful meta-analyses.

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