Mechanism-related circulating proteins as biomarkers for clinical outcome in patients with unresectable hepatocellular carcinoma receiving sunitinib

Charles S Harmon, Samuel E DePrimo, Eric Raymond, Ann-Lii Cheng, Eveline Boucher, Jean-Yves Douillard, Ho Y Lim, Jun S Kim, Maria José Lechuga, Silvana Lanzalone, Xun Lin, Sandrine Faivre, Charles S Harmon, Samuel E DePrimo, Eric Raymond, Ann-Lii Cheng, Eveline Boucher, Jean-Yves Douillard, Ho Y Lim, Jun S Kim, Maria José Lechuga, Silvana Lanzalone, Xun Lin, Sandrine Faivre

Abstract

Background: Several proteins that promote angiogenesis are overexpressed in hepatocellular carcinoma (HCC) and have been implicated in disease pathogenesis. Sunitinib has antiangiogenic activity and is an oral multitargeted inhibitor of vascular endothelial growth factor receptors (VEGFRs)-1, -2, and -3, platelet-derived growth factor receptors (PDGFRs)-α and -β, stem-cell factor receptor (KIT), and other tyrosine kinases. In a phase II study of sunitinib in advanced HCC, we evaluated the plasma pharmacodynamics of five proteins related to the mechanism of action of sunitinib and explored potential correlations with clinical outcome.

Methods: Patients with advanced HCC received a starting dose of sunitinib 50 mg/day administered orally for 4 weeks on treatment, followed by 2 weeks off treatment. Plasma samples from 37 patients were obtained at baseline and during treatment and were analyzed for vascular endothelial growth factor (VEGF)-A, VEGF-C, soluble VEGFR-2 (sVEGFR-2), soluble VEGFR-3 (sVEGFR-3), and soluble KIT (sKIT).

Results: At the end of the first sunitinib treatment cycle, plasma VEGF-A levels were significantly increased relative to baseline, while levels of plasma VEGF-C, sVEGFR-2, sVEGFR-3, and sKIT were significantly decreased. Changes from baseline in VEGF-A, sVEGFR-2, and sVEGFR-3, but not VEGF-C or sKIT, were partially or completely reversed during the first 2-week off-treatment period. High levels of VEGF-C at baseline were significantly associated with Response Evaluation Criteria in Solid Tumors (RECIST)-defined disease control, prolonged time to tumor progression (TTP), and prolonged overall survival (OS). Baseline VEGF-C levels were an independent predictor of TTP by multivariate analysis. Changes from baseline in VEGF-A and sKIT at cycle 1 day 14 or cycle 2 day 28, and change in VEGF-C at the end of the first off-treatment period, were significantly associated with both TTP and OS, while change in sVEGFR-2 at cycle 1 day 28 was an independent predictor of OS.

Conclusions: Baseline plasma VEGF-C levels predicted disease control (based on RECIST) and were positively associated with both TTP and OS in this exploratory analysis, suggesting that this VEGF family member may have utility in predicting clinical outcome in patients with HCC who receive sunitinib.

Trial registration: ClinicalTrials.gov: NCT00247676.

Figures

Figure 1
Figure 1
Plasma pharmacodynamics of soluble protein biomarkers during treatment with sunitinib. (A) VEGF-A and VEGF-C; (B) sKIT and sVEGFRs-2 and -3. C, cycle; D, day.
Figure 2
Figure 2
Plasma pharmacodynamics of VEGF-C in patients with baseline VEGF-C levels above or below the median value of 822.2 pg/mL. C, cycle; D, day.
Figure 3
Figure 3
Receiver operating characteristic (ROC) curves for prediction of disease control (partial response [PR] or stable disease [SD] > 12 weeks) by baseline level of soluble protein. Arrows indicate ROC curve-derived cut-points.
Figure 4
Figure 4
Final Kaplan-Meier estimate of time to progression (TTP) and overall survival (OS) in patients stratified by above/below median baseline levels of VEGF-C.
Figure 5
Figure 5
Kaplan-Meier estimate of time to progression (TTP) and overall survival (OS) in patients stratified by above/below median ratio to baseline levels of sKIT (A and B), sVEGF-A (C and D), and VEGF-C (E and F) at post-baseline time points. Graphs A, C, and E show TTP and graphs B, D, and F show OS. C, cycle; D, day.

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