Evaluation of KRAS mutations, angiogenic biomarkers and DCE-MRI in patients with advanced non-small cell lung cancer receiving sorafenib.

Kelly, R.J., Rajan, A., Force, J., Keen, C., Cao, L., Yu, Y., Choyke, P.L., Turkbey, B., Raffeld, M., Xi, L., Steinberg, S.M., Wright, J.J., Lopez-Chavez, A., Kummar, S., Guttierrez, M., Giaccone, G.
Journal   Clin Cancer Res.
Species  
Analytes Measured   PlGF , Flt-1 VEGFR1
Matrix Tested   Plasma
Year   2011
Volume   17
Page Numbers   1190-1199
Application   Cytokines and Chemokines
Abstract
PURPOSE: Sorafenib, a multikinase inhibitor targeting Raf and VEGFR, has shown activity in unselected patients with non-small-cell lung cancer (NSCLC). At present there are no validated biomarkers indicative of sorafenib activity.

EXPERIMENTAL DESIGN: Patients received sorafenib 400 mg BID daily to determine activity and tolerability and to measure its biological effects. KRAS mutation status (N = 34), angiogenesis markers (VEGF, bFGF, FLT-1, PLGF-1) and imaging with DCE-MRI (dynamic contrast enhanced MRI) to determine early changes in tumor vascular characteristics were evaluated. Three parameters K(trans), K(ep), and V(e) were measured by DCE-MRI at baseline and day 14 of cycle 1. Cytokine analysis was done on days 0, 14, 28, and 54.

RESULTS: Thirty-seven patients with previously treated stage IV NSCLC were enrolled in this single-center phase II trial. In 34 evaluable patients, 2 had partial responses and 20 had stable disease for 3 to 17 months, a disease control rate of 65%. The median progression-free survival (PFS) was 3.4 months, and median overall survival (OS) was 11.6 months. Toxicity was consistent with the known side effects of sorafenib. KRAS (32%) and EGFR mutations (22%) showed no correlation with response, PFS, or OS. K(ep), was significant in predicting an improvement in OS (P = 0.035) and PFS (P = 0.029). Cytokine analysis demonstrated an improved OS for bFGF day 0 (<6 vs. >6 pg/mL; P = 0.042), whereas a PFS benefit was seen with bFGF at day 28 (<6 vs. >6; P = 0.028).

CONCLUSIONS: KRAS and EGFR mutational status showed no correlation with response, PFS, or OS. Radiologic and cytokine changes may act as biomarkers indicative of early angiogenesis inhibition.

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