SMART1 is a highly specific and CRBN-dependent PROTAC that can effectively degrade Smurf1. SMART1 can block the PDK1-Akt signaling pathway in KRAS mutant colorectal cancer. SMART1 can inhibit tumor growth in KRAS mutant colorectal cancer (CRC) xenograft models. (Blue: CRBN ligand; Black: linker; Pink: Smurf1 ligand (Smurf1-L) ) [1].