HDAC9 and cancer: HDAC inhibition or EGFR inhibition is reported to be associated with cellular functions such as cell apoptosis and cell‐cycle arrest.[23, 55] To verify if our developed GM‐protac could also induce cancer cell apoptosis and cell cycle arrest, we treated H1975‐OR cells with different concentrations of GM‐protac and tested by FACS using FITC‐labeled Annexin V and propidium iodide (PI).