CRA-026440 inhibits the growth of human tumor xenografts in vivo. CRA-026440 inhibits the growth of human tumor xenografts in vivo. The growth of tumors over time is plotted in (A) U937 histiocytic tumor xenograft model (vehicle alone, ♦; 100 mg/kg, ×; 50 mg/kg, ▴; 25 mg/kg, ▪), (B) HCT 116 colon tumor xenograft model (vehicle alone, ♦; 150 mg/kg, ◊; 100 mg/kg, ×; 75 mg/kg, ▴; 50 mg/kg, ▪), (C) HCT116 colon tumor xenograft model (vehicle alone, ♦; 50 mg/kg qdx4/wk, ▪; 67 mg/kg qdx3/wk, □; 100 mg/kg qdx2/wk, ×; 100 mg/kg Monday + Friday/wk, ◊), (D) HCT 116 colon tumor xenograft model (vehicle alone, ♦; 25 mg/kg, ▴; 50 mg/kg, ▪; Avastin 25 mg/kg, ×; Avastin + CRA-026440 at 25 mg/kg, ▵; Avastin + CRA-026440 at 50 mg/kg, □). Ki67 immunohistochemical analysis: (E) HCT 116 xenograft tumors with three daily i.v. treatment of vehicle, (F) HCT 116 xenograft tumors with three daily i.v. treatment of CRA-026440 at 100 mg/kg. Error bars were calculated as described in Materials and Methods. *, P < 0.05; **, P < 0.01. Z. Alexander Cao et al. Mol Cancer Ther 2006;5:1693-1701 ©2006 by American Association for Cancer Research