Background:
* von Hippel-Lindau (VHL) inactivation by mutation or promoter hypermethylation is seen in a high proportion of sporadic clear cell renal cancers.
* Inactivation of VHL leads to accumulation of proteins targeted for degradation through the ubiquitin pathway, which includes a group of transcriptionally active proteins called the hypoxia inducible factors (HIF), whose alpha subunits undergo degradation in a VHL-dependent fashion.
* Accumulation of HIFs results in overexpression of several genes including vascular endothelial growth factor (VEGF), glucose transporter 1 (GLUT-1), transforming growth factor (TGF-a), platelet derived growth factor (PDGF), and erythropoietin, which are believed to play a role in tumorigenesis, tumor progression and metastasis.
* Kinase insert domain-containing receptor/vascular endothelial growth factor receptor 2 (kinase insert domain receptor (KDR)/vascular endothelial growth factor 2 (VEGFR2)) is an endothelial cell receptor for vascular endothelial growth factor (VEGF) and plays a crucial role in mediating tumor angiogenesis, while EGFR (a receptor for TGF-a and epidermal growth factor (EGF) is believed to mediate tumor growth and proliferation.
* ZD6474 is an orally administered receptor tyrosine kinase inhibitor with activity against the KDR/VEGFR2 and the epidermal growth factor receptor (EGFR).
Objective:
Primary Objective
-To evaluate the efficacy (overall response rate) of single agent ZD6474 in advanced clear cell renal cell carcinoma (RCC).
Secondary Objectives
* To evaluate progression free survival in patients treated with ZD6474.
* To study the safety and tolerability of ZD6474.
* To evaluate the correlation between VHL mutational status and response to ZD6474.
* To investigate the effect of ZD6474 on circulating endothelial cells and endothelial progenitor cells and to explore the utility of these markers as surrogates of angiogenesis inhibition.
* To investigate the effect of ZD6474 on potential biomarkers of angiogenesis in plasma such as VEGF and soluble VEGFR2.
* To study the effect of ZD6474 treatment on tumor vascular flow and permeability using dynamic contrast enhanced magnetic resonance imaging.
* To investigate the effect of ZD6474 on EGFR and VEGFR mediated signaling using tumor biopsy tissue (when available).
Eligibility:
* Adults with measurable advanced clear cell renal carcinoma
* Patients must have received no more than three prior systemic therapies (no more than two agents known to inhibit VEGF or VEGFR) and must have either progressed on or be unable to receive 1) Sunitinib or sorafenib, and 2) High dose interleukin-2 (IL-2).
Design:
* Single agent ZD6474 administered daily at a dose of 300mg/day.
* Patients will be evaluated for response every 8 weeks using Response Evaluation Criteria in Solid Tumors (RECIST) criteria.
* The study is based on an open label Simon two-stage optimal phase II design and will accrue a maximum of 37 patients.