MS 39 is a highly effective, highly affinity and selective depressant of mutant epidermal growth factor receptor (EGFR) with high efficiency, high affinity and selectivity. MS 39, conjured by gefitinib to VHL ligand via a linker, effectively induced the degradation of mutant EGFR (DC50 values in HCC827(exon 19 del) and H3255 (L858R mutation) lung cancer cell lines were 5 nM and 3.3 nM, respectively). However, there was no significant effect in wild-type EGFR cell lines with concentrations up to 10 μM. MS 39 inhibited the proliferation of H3255 lung cancer cells in vitro and was bioavailable in mice after administration.

MS 154 is a potent and selective cereblon-recruiting Degrader (PROTAC®) of mutant epidermal growth factor receptor (EGFR), comprising a cereblon-binding moiety joined by a linker to gefitinib(Iressa). MS 154 decreases EGFR protein levels, inhibits downstream signaling in and inhibits proliferation of mutant EGFR-bearing lung cancer cells (DC50values are 11 and 25 nM in HCC-827 and H3255 cells, respectively; Dmax> 95% at 50 nM), but not in WT-EGFR-bearing ovarian and lung cancer cells lines. Bioavailable in mice following ip administration.

MS9427 is a potent PROTAC EGFR degrader, demonstrating high affinity for EGFR with dissociation constants (K d s) of 7.1 nM for the wild-type (WT) EGFR and 4.3 nM for the L858R mutant EGFR, indicating selective degradation of the mutant over the WT EGFR. This degradation occurs through both ubiquitin/proteasome system (UPS) and autophagy/lysosome pathways. Furthermore, MS9427 effectively inhibits the proliferation of non-small cell lung cancer (NSCLC) cells, positioning it as a potential therapeutic agent in anticancer research [1].

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].