GLI1 is a protein originally isolated in human glioblastoma. The GLI proteins are the effectors of Sonic Hedgehog (Hh) signaling and have been shown to be involved in cell-fate determination, proliferation and patterning in many cell types and most organs during embryo development. GLI1 was originally isolated from a glioma tumor and has been found to be up regulated in many tumors including muscle, brain and skin tumors such as Basal cell carcinoma (BCC). Shh and the Gli genes are normally expressed in hair follicles, and skin tumors expressing Gli1 may arise from hair follicles. The level of Gli1 expression correlates with the tumor grade in bone and soft tissue sarcomas.