Paraffin sections (5 μm) from xenograft tumor samples were deparaffinized in 100% xylene and rehydrated with a decreasing ethanol series and then water. Antigen retrieval was conducted in 0.01 mol/L sodium citrate buffer (pH 6.0) at 100°C for 10 minutes. IHC assay was performed as described previously using supersensitive horseradish peroxidase immunohistochemistry kit (Sangon Biotech, Shanghai, China) [3 (link)] per manufacturer’s instructions with anti-Ki67 antibody (sc-23900, Santa Cruz) and anti-MMP2 antibody (sc-13595, Santa Cruz).
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