This is a prospective cohort, one center. twenty patients who will undergo percutaneous stent implantation with everolimus eluting stent will be include. The primary endpoint was the correlation between the change (baseline vs. 1 week) in the number of circulating endothelial progenitor cells and in cell functionality following an everolimus eluting stent implantation with the grade of neointimal hyperplasia measured by optical coherence tomography