ab hg fe d c Supplementary Figure 1 Supplementary figure 1: Validation of the ERRα antibody used for immunohistochemical analysis. Control MCF7 breast cancer cell line (a), ERRα siRNA treated MCF7 cells (b). Representative selection of immunohistochemical staining pattern of ERRα; negative nucleus (c), strong nucleus (d), negative cytoplasm (e), strong cytoplasm (f), medium cytoplasm and medium nucleus (g), and a mix of medium and negative nuclei (h). To validate the ERRα antibody used for immunohistochemistry MCF7 cells (ATCC, LGC standards, UK) cultured in phenol-red free Optimem media supplemented with 4% FBS (Gibco by Life Technologies, UK) were transfected with control siRNA (Silencer® Negative Control No. 1; AM4611) or ERRα -directed siRNA (Ambion by Life Technologies, UK; s4829 and s4830) using the Amaxa Nucleofector system (Lonza, Swizerland; Program P-020) with the nucleofection reagent kit V. Transfected cells were harvested 72 h post-transfection, formalin fixed, dehydrated and paraffin embedded. Sections of 4µm were prepared for immunohistological staining according to the protocol used for TMAs.
ER- Cytoplasmic ERRαNuclear ERRα AB HR (BCS): 1.46 ( ) HR (RFS): 1.08 ( ) HR (BCS): 2.94 ( ) HR (RFS): 1.73 ( ) Adjuvant untreated Supplementary Figure 2 Supplementary Figure 2: The prognostic value of ERRα protein expression and subcellular location in adjuvant-untreated ER-negative patients. The prognostic value of ERRα levels evaluated according to hormone receptor status in adjuvant untreated patients (A- B). Breast cancer survival (BCS), Hazard ratio (HR); (95% confidence interval).
ER+ Cytoplasmic ERRαNuclear ERRα HR (BCS): 1.46 ( ) HR (RFS): 1.27 ( ) RFS, HR: 0.76 ( ), p=0.31 MFS, HR: 0.81 ( ), p=0.50 BCS, HR: 0.93 ( ), p=0.85 HR (BCS): 0.98 ( ) HR (RFS): 1.18 ( ) RFS, HR: 0.86 ( ), p=0.58 MFS, HR: 0.93 ( ), p=0.82 BCS, HR: 1.32 ( ), p=0.48 Adjuvant untreated Tamoxifen treated A C B D Supplementary Figure 3 Supplementary Figure 3: ERRα protein expression is not prognostic in ER-positive breast cancer. The prognostic value of ERRα levels evaluated according to hormone receptor status in adjuvant untreated patients (A, C), and in tamoxifen-treated patients (B, D). Breast cancer survival (BCS), Recurrence-free survival (RFS), Metastasis-free survival (MFS), Hazard ratio (HR); (95% confidence interval).