Falnidamol (BIBX 1382) is an orally active, selective EGFR tyrosine kinase inhibitor with an IC50 of 3 nM. Falnidamol displays > 1000-fold lower potency against ErbB2 (IC50=3.4 μM) and a range of other related tyrosine kinases (IC50>10 μM). Falnidamol is a pyrimido-pyrimidine compound and has anti-cancer activity.

ErbB2:3.4 μM, EGFR:3 nM

Animal Model: Five- to six-week-old athymic NMRI-nu/nu female mice (21-31 g) with A431, FaDu, or HN5 cells
Dosage: 10 mg/kg
Administration: p.o.; daily; 16 days
Result: Completely suppressed tumor growth of human A431 xenografts with respective T/C values of 15 and 6% after 2 weeks of treatment [2].