Signal transducer and activator of transcription 3 (STAT3) is a central mediator of cytokine and growth factor signaling and is aberrantly activated in approximately 70% of human cancers. Persistent STAT3 signaling drives tumor proliferation, survival, metastasis, angiogenesis, immune evasion and inflammation. Researchers from the University of Michigan reported the discovery and preclinical characterization of SD-965, a selective STAT3 PROTAC degrader.