Heat shock protein 90 (Hsp90) consists of four isoforms. Among them, the Hsp90α is overexpressed in advanced tumors and involved in tissue repair, tumor migration and metastasis as well. Researchers from Fujian Medical University (FJMU) reported on the discovery and preclinical characterization of [I], a selective proteolysis targeting chimera (PROTAC) acting as an Hsp90α protein degradation inducer for breast cancer treatment.