Alofanib (RPT835) is a novel selective allosteric inhibitor of FGFR2 and has a dramatic inhibitory effect with IC50 <10 nM on FGF2-induced phoshphorylation of FRS2a in KATO III cells. Alofanib induces mainly apoptosis with cleavage of caspase 3, PARP and Bcl-2 in SKOV3 cell line. Cytotoxic effect of compound on ovarian cancer cells is low. Alofanib inhibits phosphorylation of FRS2α with the IC50 values of 7 and 9 nmol/l in cancer cells expressing different FGFR2 isoforms. In a panel of four cell lines representing several tumour types (triple-negative breast cancer,melanoma, and ovarian cancer), alofanib inhibits FGF-mediated proliferation with 50% growth inhibition (GI50) values of 16-370 nmol/l. Alofanib dose dependently inhibits the proliferation and migration of human and mouse endothelial cells (GI50: 11-58 nmol/l) compared with brivanib and bevacizumab.
In vivo, Intravenous alofanib significantly in dose-dependent manner potentiated the efficiency of the combination of paclitaxel and carboplatin. Alofanib suppresses angiogenesis in ovarian cancer mouse model. In a FGFR-driven human tumour xenograft model, oral administration of alofanib is well tolerated and results in potent antitumour activity.
|Cell lines||SKOV3, HS478T, Mel Kor cells|
|Preparation method||Inhibited growth of SKOV3 and HS578T cells with GI50s of 0.37 and 0.21 μM. Did not potently inhibit growth of Mel Kor cells that do not contain FGFR2 (GI50>10 μM).|
|Concentrations||0.2, 0.4, 0.8 μM|
|Incubation time||6 hours after dosing, FGF2 is added at a concentration of 25 ng/ml|
|Animal models||C57Bl/6 × DBA/2 F1 mice of 22-30 g|
|Administration||Intraperitoneally, 0, 3 and 6 d|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
|Solubility||DMSO ≥ 30 mg/mL|
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