BIBX 1382

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]

References:
1. F. F. Solca, A. Baum, E. Langkopf, G. Dahmann, K. H. Heider, F. Himmelsbach and J. C. van Meel, J Pharmacol Exp Ther 2004, 311, 502-509.

Phase I and pharmacokinetic study of BIBX 1382 BS, an epidermal growth factor receptor (EGFR) inhibitor, given in a continuous daily oral administration.[Pubmed:12008195]

Eur J Cancer. 2002 May;38(8):1072-80.

The pyrimido-pyrimidine BIBX 1382 BS inhibits the intracellular tyrosine kinase domain of the epidermal growth factor receptor (EGFR), thus specifically reverting the aberrant enzymatic activity from overexpressed and constitutively activated EGFR. A phase I and pharmacokinetic study of this new specific molecule was carried out. After initially performing an accelerated titration design from the first toxicities onwards, a modified Fibonacci scheme was used to escalate the daily oral dose. The following dosages and cycles (defined as treatment during 28 days) were applied: 25 mg: 6; 50 mg: 3; 100 mg: 6; 200 mg: 7; 150 mg: 3. Over a 10 months accrual phase, 11 patients (pts) (7 females, 4 males) with a median age of 63 years (range 50-73 years), World Health Organization Performance Status (WHO PS) 0:5 pts, 1:6 pts and miscellaneous solid tumours were entered. The median number of cycles applied per pt was 2 (range 1-7). Reversible, dose-dependent increase of liver enzymes (maximal Common Toxicity Criteria (CTC) grades: gamma-glutamyl transferase (GGT): 4, aspartate aminotransferase (GOT): 3, alanine aminotransferase (GPT): 3, alkaline phosphatase (AP): 3, bilirubin: 3) occurred. Oral medication yielded plasma levels far below those expected to be efficacious. In conclusion, target plasma levels could not be reached via the oral route at a reasonable dosage. Meanwhile, a preclinically unknown metabolite was identified from the urine of one patient. Subsequently, this metabolite was found to be abundant in patient plasma. The metabolite was demonstrated to be pharmacologically inactive. Due to a dose-limiting increase of liver enzymes, low bioavailability of BIBX 1382 BS and the detection of a pharmacologically inactive metabolite, this trial was discontinued.

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.

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