The TCF4/β-catenin axis is a key driver of tumor growth, where β-catenin has remained resistant to therapy and is traditionally considered an undruggable protein. At the ACS Fall 2025 meeting, Parabilis Medicines Inc. divulged results of work on hyperstabilized α-helical peptides named helicons that directly bind to β-catenin and block its interaction with TCF transcription factors such as TCF4, as well as inhibit the Wnt signaling pathway.