A gene expression signature of pancreatic adenocarcinoma. A two-class statistical analysis (see Methods) identified 147 transcripts (rows) differentially expressed (FDR ≤10%) between primary adenocarcinoma samples and histologically normal and chronic pancreatitis samples combined (columns). Patient ID numbers are shown below the columns. Forty three transcripts mapping to intronic or intergenic regions were identified (43/147, i.e. 29%). Expression level of each gene is represented by the number of standard deviations above (red) or below (blue) the average value for that gene across all samples. Samples are ordered according to their individual correlation to the average profile of the primary tumor samples. Sample tissue histology is shown below each patient ID.