In areas of mPIN (n=12 mice, 35-49 weeks; Fig. 4B,B′; Fig. S9B) or MIC (n=6 mice, 45-49 weeks; Fig. 4C,C′; Fig. S9C) of PB-MYC tumors, Gli1nlacZ was expressed in scattered cells in the stroma, primarily adjacent to the tumor epithelium. Here, MYC is linked to neoplasm.