Frozen sections (8 μm thick) were stained by using the NoVo Link Polymer Detection System (Leica, Biosystems Newcastle Ltd, UK), followed by AEC substrate kit (Vector Laboratories Inc. Burlingame, CA), according to the manufacturer's instruction. Hematoxylin and eosin (H&E) stain and immunohistochemistry study were performed as described previously48 (link). Isotype antibody was used as the staining negative control. Anti-Ki-67 and anti-caspase 3 antibodies were from Santa Cruz and Cell Signaling.
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