Correlation between data obtained from Nanostring and RQ-PCR analysis on fresh-frozen and FFPE tissues. Scatter-plot matrices examining the correlation between Nanostring and RQ-PCR data in fresh-frozen (A) and FFPE (B) samples. Scatter plot matrices show normalized quantification values. The pair-wise Pearson product-moment correlation coefficient for Nanostring vs. RQ-PCR data in fresh-frozen samples was r = 0.78 (p < 0.0001); this same analysis revealed a lower correlation coefficient in FFPE samples (r = 0.59) (p < 0.0001). A corresponding heatmap for the Pearson correlation of gene expression abundance in fresh-frozen (FF) and FFPE samples using Nanostring vs. RQ-PCR is shown to the right of each scatter plot (C and D respectively). These results show a good correlation between Nanostring and RQ-PCR in fresh-frozen samples, and a lower correlation between data obtained using these two different technologies, when using clinical, archival, FFPE tissues.