To evaluate tumor tissue histological changes, tumor sections were processed and immunohistochemical staining of the paraffin sections was performed using a microwave-based antigen retrieval technique, specimen slides were incubated overnight at 4 °C with primary antibodies that were raised against Ki67 (D2H10, Cell Signaling Technology), then Dako LSAB2 System-HRP (K0675), and Dako Liquid DAB + Substrate Chromogen System (K3468).
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