Haematoxylin and eosin stained AC220 order slides were reviewed to confirm the diagnosis of invasive breast cancer; afterwards,

two representative tumor regions were selected and marked on the donor blocks. Tumor TMA blocks were created by punching a cylinder using a hollow needle with a diameter of 2 mm; the blocks were obtained from the two selected areas of each donor block before being inserted into an empty paraffin block. Subsequently, these blocks were cut into 4 μm thick slides and prepared for immunohistochemical (IHC) analysis. Immunohistochemical analysis Using IHC staining, the expression of different proteins in human breast cancer was verified. In this process, sections were deparaffinaged in xylene prior to rehydration

using find more gradient alcohol. Endogenous peroxydase activity was blocked by 3% hydrogen peroxide in 50% methanol for 20 minutes. For antigen retrieval, sections were treated with citrate buffer saline (pH 6.0) for 15 minutes at 95°C in a microwave oven. After blocking with 10% normal goat Histone Methyltransferase inhibitor serum for 30 minutes at room temperature, sections were incubated with primary antibodies for another 30 minutes at room temperature. The sections were subsequently incubated for 16 hours at 4°C. Primary antibodies and dilution were as follows: rabbit polyclonal anti-CXCR4 (Abcam, dilution 1:100); rabbit polyclonal anti-CCR7 (Abcam, dilution 1:100); rabbit polyclonal anti-CXCL12 (Abcam, dilution1:100); goat polyclonal anti-CCL21 (Santa Cruz Biotechnology, dilution 1:50); rabbit polyclonal anti-EGFR (Santa Cruz Biotechnology, dilution 1:100); mouse monoclonal anti-ER (Zhongshan; ready-to-use); rabbit polyclonal anti-PR (Santa Cruz Biotechnology,

dilution 1:100); and mouse monoclonal anti-HER2 (Zhongshan; ready-to-use). Following incubation, Plasmin sections were lavaged with phosphate buffered solution (PBS) and incubated with horseradish peroxidase (HRP)-conjugated goat anti-rabbit IgG, goat anti-mouse IgG, or rabbit anti-goat IgG for 40 min at room temperature. Staining was performed using 3,3′-diaminobenzidine (DAB). Sections were counterstained with haematoxylin followed by dehydration and mounting. Negative controls were prepared using PBS in lieu of the first antibody. Scoring of immunostaining Sections were read by two separate pathologists blinded to patients’ clinical pathology parameters. Both intensity and percentage of positive cells were considered. Five microscopy fields were reviewed in each core with 400× magnification, after which positive cells of 100 tumor cells in each field were counted. In staining for CXCR4, CCR7, CXCL12, CCL21 and EGFR, tumor cells with brown cytoplasm and/or nucleus or membrane were considered positive and then scored based on four classes: none (0); weak brown (1+); moderate brown (2+); and strong brown (3+).