IHC staining and score calculation were conducted as described previously (20 (link)). Anti-ZEB1 antibody (1:100; cat. no. ab203829; Abcam) was used to detect their expression levels in mouse tumors. Images were visualized using a Nikon ECLIPSE Ti (Nikon Corporation) inverted microscope system (x20 magnification) and processed using Nikon software (CaptureNX2, version 2.4.7).