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Analysis of concordance in mRNA measurements between snap frozen and formalin-fixed paraffin-embedded (FFPE) breast tumors. Twenty-three breast tumors are ranked for their level of mRNA expression of the indicated genes (normalized to Hmbs expression). Results using RNA extracted from snap frozen (y-axis) versus FFPE (x-axis) pieces of the same breast tumor are shown. Spearman’s rank order correlation coefficients are indexed above each graph.
