Paraffin sections (5 μm) from tumor tissue 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 min. Immunohistochemistry assay was performed as described previously [22 (link)] using super-sensitive horseradish peroxidase immunohistochemistry kit (Sangon Biotech, Shanghai, China) per the manufacturer’s instructions, and the anti-Ki67 antibody (sc-23900, Santa Cruz) was used.
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