Gefitinib (ZD1839): Selectivity & Specificity
Gefitinib (ZD1839) is a potent inhibitor of Raf (>10µM), MEK-1 (>10µM), ERK-2 (>100µM), EGFR2 kinase domain (1.2–3.7 µM), EGFR (2.12 ± 0.25 nM), VEGFR-2 (45.3 ± 1.2 nM), and EGFR kinase (0.5–33 nM). Gefitinib (ZD1839) exhibits the greatest inhibitory potency toward EGFR kinase (IC50 = 0.5–33 nM).