MKI67 and cancer: Mirroring the situation in cancer compartment, these stromal subpopulations displayed diverse phenotypes with the most significant differences in the expression of CD90, αSMA, and CD29 – a set of well‐known cancer‐associated fibroblast (CAF) markers, surface integrin CD49c, adhesion G protein‐coupled receptor family member CD97, tetraspanin CD9, canonical TGF‐β signaling hallmark pSmad2, and proliferation surrogate Ki‐67 (Fig. S3C,D).