Methods and compositions are provided for modulating Hedgehog (Hh) pathway signaling in a cell. Aspects of the methods include methods for inhibiting Hh pathway-promoted cancer proliferation and/or metastasis that is promoted by Hh pathway signaling, methods for treating cancers promoted by Hh pathway signaling, and methods for screening candidate agents for the ability to treat a cancer promoted by Hh pathway signaling. In addition, reagents and kits thereof that find use in practicing the subject methods are provided.