Figure 4

First two principal components of miRNA expression analysis in the BPV Study. Samples are colored by tissue and by the preservation group: FFPE with 1 (n = 29), 2 (n = 30), 3 (n = 30), or 12 h (n = 30) DTF or matched snap-frozen controls (n = 30). Renal carcinoma (kidney), colon adenocarcinoma (colon) and fallopian tube and peritoneal carcinoma (ovary) specimens clustered separately in this plot, but there was no clustering by DTF. One colon specimen with a 1 h DTF (Sample 51-4) was omitted.