MC-Sq-Cit-PAB-Gefitinib is a potent antitumor drug-linker conjugate for Antibody-Drug Conjugates (ADC), utilizing Gefitinib—an EGFR tyrosine kinase inhibitor—connected through the MC-Sq-Cit-PAB ADC linker.
Gefitinib impurity 1 is a compound derived from Gefitinib, a potent and selective EGFR tyrosine kinase inhibitor (IC 50 = 33 nM). This orally active compound selectively inhibits tumor cell growth stimulated by EGF (IC 50 = 54 nM) and inhibits EGFR autophosphorylation induced by EGF in tumor cells. Additionally, Gefitinib induces autophagy and exhibits antitumor activity.