Over-time reproducibility of BluePrint FFPE indices. Chart showing over-time index measurements from January 2012 through January 2015 of three clinical control samples covering the three subtypes. A. C1, measuring Luminal-type index n = 1639, B. C2, measuring HER2-type index n = 1534, C. C3, measuring Basal-type index n = 1594. Concordance for all samples overtime was 100%. Each dot represents a single breast cancer sample for which total RNA underwent BluePrint microarray laboratory processing and analysis.