Contingency table.

8,977 genes that were classified as expressed or non-expressed by integrating two gene expression data sets for PANC-1 cells (only genes that are absent or present in all data sets were considered) were examined for expression by integrating two PANC-1 expression data sets and assigned with an absent or present expression status by stringent criteria. For genes targeted by siRNA pools exhibiting a significant phenotype (primary screening hits) no significant difference between expressed and non-expressed genes could be detected (p = 0.32). Contingency table.