Overview of the samples included in the study.

FF = Fresh Frozen, FFPE = Formalin Fixed Paraffin Embedded; pair_ID = number of the pair FF-FFPE; FF (FFPE)_ID = FF (FFPE) sample identifier; FF (FFPE)_array_ID = sample identifier on the array; a, b = biological replicates, c = technical replicate; RIN = RNA Integrity Number; ER = Estrogen Receptor; PR = Progesteron Receptor; HER2 = Human Epidermal growth factor Receptor 2; IHC = Immunohystochemistry; CISH = Chromogenic In Situ Hybridization; MP = MammaPrint, High = high risk, Low = low risk; grade = histological grade; NA Not Available.