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BIBX1382 is a potent, selective inhibitor of epidermal growth factor receptor (EGFR) tyrosine kinase with IC50 value of 3 nM.[1]

BIBX1382 is an inhibitor of EGFR kinase for treatment of cancer. In a tyrosine kinase activity assay using cytoplasmic tyrosine kinase domains of EGFR, HER2, VEGFR2, HGFR, IGF1R, B-InsRK and c-src cloning and expressing in Sf9 insect cells, BIBX1382 selectively and potently inhibited EGFR kinase activity with an IC50 value of 3 nM. In the EGFR and pEGFR ELISA assay using EGFR highly expressed A431 cells (vuval squamous cell carcinoma), BIBX1382 inhibited EGFR phosphorylation at EC50 at 141 nM.[1] In A431, FaDu (hypopharyngeal squamous cell carcinoma) and HN5 (head and neck squamous cell carcinoma) xenograft nude mice models, oral administration of BIBX1382 at dose of 10 mg/kg daily showed strong antitumor activity in a dose-dependent manner after 2 weeks of treatment. Moreover, tumor regressions were obtained after 170 days’ long term oral administration of BIBX1382 at dose of 50 mg/kg daily in A431 xenograft nice model.[1]

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