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Analysis an Affymetrix U133 2.0 Plus data set previously obtained by us on thirty other MPM tumor specimens compared with normal peritoneum (n = 7) [23]. Profiling of Affymetrix data to identify statistically significant biological groups of genes was done using Xenobase software for hypergeometric analysis of gene annotations provided by the Gene Ontology Program http://www.geneontology.org. RT-P