This is a phase II randomized clinical trial to study the effect of COX-2 inhibitor Celecoxib and EGFR tyrosine kinase inhibitor Erlotinib alone or in combination on molecular markers of apoptosis and angiogenesis.
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Change in expression of selected biomarkers in tissue samples, assessed by immunohistochemistry (IHC) and PCR
Timeframe: baseline and 21 days