IHC was executed as previously described.23 (link) The antibodies used in the IHC were anti-KDM5A and anti-ki-67 (Abcam, USA). The KDM5A protein would be quantified with the proportion and intensity of positively stained cells across three randomized images. We used the NanoZoomer 2.0-RS system (Hamamatsu Photonics Inc., Germany) to obtain the images and the software NDP.view 2.5.14 version to analyze the digital slides.