Lucitanib (E-3810) is a novel VEGFR and FGFR inhibitor. It potently and selectively inhibits VEGFR1, VEGFR2, VEGFR3, FGFR1 and FGFR2 (IC50s: 7 nM, 25 nM, 10 nM, 17.5 nM, and 82.5 nM, respectively).

Lucitanib potently inhibits FGFR2 activity (Ki<0.05 μM), follows by PDGFRα activity (Ki=0.11 μM) and it also potently inhibits VEGF and bFGF-stimulated HUVEC proliferation (IC50: 40 and 50 nM, respectively), which consistent with the inhibitory activity of VEGFR and FGFR auto-phosphorylation. Lucitanib (E-3810) also inhibits CSF-1R (IC50: 5 nM)[1].The Ki values obtained for DDR2, LYN, CARDIAK, CSBP (2), EPHA2, and YES range between 0.26 and 8 μM[2].

Lucitanib (20 mg/kg; 7 consecutive days; p.o.) treatment, completely inhibits (P<0.01) the bFGF induced angiogenic response compare with the response in vehicle-treated mice. E-3810 significantly delays growth during treatment, but tumors resume their growth when treatment is suspended; in a few cases, tumor regression is observed[1]. The activity of Lucitanib given at the doses of 15 mg/kg is tested on MDA-MB-231 breast cancer transplanted subcutaneously, at a late stage, when tumor masses reach 350 to 400 mg. This tumor xenograft is very sensitive to Lucitanib , with complete tumor stabilization lasting throughout the 30-day treatment. As in other tumor models, tumors re-grow after withdrawal of Lucitanib at a rate similar to control tumors[3]. Lucitanib displays a broad spectrum of activity, being active in all the xenografts tested (HT29 colon carcinoma, A2780 ovarian carcinoma, A498, SN12K1, and RXF393 renal carcinomas). It has dose-dependent inhibition of tumor growth.