The anti‐Ki‐67 (1:2,00, ab15580; Abcam) and anti‐SGTB (1:1000, ab202419, Abcam), biotinylated goat anti‐rabbit IgG secondary antibody (1:300, ab64256, Abcam) and 3,3‐diaminobenzidine (DAB) kits (Vector Laboratories, Peterborough, UK) were used for IHC analysis based on standard methods[18 (link)].