Figure 5
From: Intrinsic bias in breast cancer gene expression data sets
Hazard ratio point estimates tend to be larger in the TRANSBIG data set for ER positive tumors. The graphs were based on unsupervised hierarchical clustering analyses using the 5,000 randomly-generated unigene gene. Bars represent the median hazard ratio (HR) from univariate Cox regression analyses and the whiskers represent the inter-decile range (10%–90%) of the values. A. Results from analyses based on all tumors in each data set. B. Results from analyses based on ER positive tumors.