MS9427 TFA is a potent PROTAC-based EGFR degrader, exhibiting dissociation constants (Kd) of 7.1 nM for wild-type EGFR and 4.3 nM for the L858R EGFR mutation. It preferentially degrades the mutant EGFR, sparing the wild-type form, utilizing both the ubiquitin/proteasome system (UPS) and the autophagy/lysosome pathways. Its efficacy extends to the significant inhibition of non-small cell lung cancer (NSCLC) cell proliferation, indicating its potential utility in anticancer research [1].