Varlitinib 是有效，可逆的泛 EGFR 小分子抑制剂，对 HER1，HER2 和 HER4 的 IC50 值分别为7，2，4 nM。

Varlitinib is a potent, reversible, small molecule pan-EGFR inhibitor with IC50s of 7, 2, 4 nM for HER1, HER2 and HER4, respectively.

In cell-based assays using tumor cells that over-express EGFR (A431) or ErbB-2 (BT474), Varlitinib (ARRY-334543) potently inhibits substrate phosphorylation. Varlitinib is shown to be highly selective for EGFR/ErbB-2, and does not show any significant activity when screened against a panel of 104 kinases[2].

Varlitinib treatment potently inhibits tumor growth with complete tumor regression observed at dosing of 100 mg/kg twice a day. After five days of Varlitinib treatment, phosphorylation of HER1-3, RAS/RAF/MEK/MAPK, p70S6K, S6 ribosomal, 4EBP1, Cdk-2, Cdc-2 and retinoblastoma are strongly inhibited. Varlitinib treatment results in a significant reduction in survivin and a concomittant increase in Caspase 3 cleavage products[1]. In murine xenograft models, Varlitinib (ARRY-334543) demonstrates significant dose-related (25, 50, 100 mg/kg) tumor growth inhibition in A431-derived tumors when administered orally, twice a day, for 21 days[2].

845272-21-1

C22H19ClN6O2S

466.94

ARRY-334543;ASLAN001

DMSO:31.5mg/mL (67.5mM),ultrasonic and warming and heat to 60°C
Ethanol:<1 mgml
H2O:<1 mgml
Powder: -20°C for 3 years
In solvent: -80°C for 2 years