Initial testing (stage 1) of the multi-targeted kinase inhibitor sorafenib by the pediatric preclinical testing program.

Journal Article

BACKGROUND: Sorafenib is an inhibitor of multiple kinases (e.g., VEGF receptors, PDGFR, FLT3, RET, BRAF, KIT) and is approved by FDA for treatment of two adult cancers. The activity of sorafenib was evaluated against the PPTP's in vitro and in vivo panels. PROCEDURES: Sorafenib was evaluated against the PPTP in vitro panel using 96-hr exposure at concentrations ranging from 1.0 nM to 10.0 µM. It was tested against the PPTP in vivo panels at a dose of 60 mg/kg administered by oral gavage daily for 5 days per week, repeated for 6 weeks. RESULTS: In vitro sorafenib demonstrated cytotoxic activity, with a median IC(50) value of 4.3 µM. Twenty of 23 cell lines had IC(50) values between 1.0 and 10.0 µM. A single cell line (Kasumi-1) with an activating KIT mutation had an IC(50) value < 1.0 µM (IC(50) = 0.02 µM). In vivo sorafenib induced significant differences in event-free survival (EFS) distribution compared to control in 27 of 36 (75%) of the evaluable solid tumor xenografts and in 1 of 8 (12.5%) of the evaluable ALL xenografts. Sorafenib induced tumor growth inhibition meeting criteria for intermediate activity (EFS T/C) in 15 of 34 (44%) evaluable solid tumor xenografts. No xenografts achieved an objective response. CONCLUSIONS: The primary in vitro activity of sorafenib was noted at concentrations above 1 µM, with the exception of a more sensitive cell line with an activating KIT mutation. The primary in vivo effect for sorafenib was tumor growth inhibition, which was observed across multiple histotypes.

Full Text

Duke Authors

Cited Authors

  • Keir, ST; Maris, JM; Lock, R; Kolb, EA; Gorlick, R; Carol, H; Morton, CL; Reynolds, CP; Kang, MH; Watkins, A; Houghton, PJ; Smith, MA

Published Date

  • December 1, 2010

Published In

Volume / Issue

  • 55 / 6

Start / End Page

  • 1126 - 1133

PubMed ID

  • 20672370

Electronic International Standard Serial Number (EISSN)

  • 1545-5017

Digital Object Identifier (DOI)

  • 10.1002/pbc.22712

Language

  • eng

Conference Location

  • United States