Afatinib N-Oxide, an impurity resulting from the oxidative degradation of Afatinib, is an irreversible inhibitor of the EGFR (Epidermal Growth Factor Receptor) family.
Afatinib impurity 11 is an impurity of Afatinib. Afatinib is an irreversible EGFR family inhibitor with IC50s of 0.5 nM, 0.4 nM, 10 nM and 14 nM for EGFRwt, EGFRL858R, EGFRL858R T790M and HER2, respectively[1]. [1]. Li D, et al. BIBW2992, an irreversible EGFR HER2 inhibitor highly effective in preclinical lung cancer models. Oncogene. 2008 Aug 7;27(34):4702-11.
DBPR112 is a potent EGFR inhibitor (IC50=487 nM) as a Clinical Candidate for the Treatment of Non-Small Cell Lung Cancer. DBPR112), DBPR112 not only displayed a potent inhibitory activity against EGFRL858R T790M double mutations but also exhibited tenfold potency better than the third-generation inhibitor, osimertinib,against EGFR and HER2 exon 20 insertion mutations. Overall, pharmacokinetic improvement through lead-to-candidate optimization yielded fourfold oral AUC better that afatinib along with F = 41.5%, an encouraging safety profile, and significant antitumor efficacy in in vivo xenograft models.