求翻译：经皮冠状动脉介入治疗术后再狭窄最常见的现象是支架内形成了因血管平滑肌细胞迁移、增生和分泌细胞外基质而导致的过度增厚的新生内膜，而后者起因在于内膜的完整性受到破坏，内皮细胞受损，内膜下胶原暴露[3]。内皮细胞在PCI术后再狭窄过程中的作用逐渐被认识，人们开始关注内皮细胞在预防PCI术后再狭窄所起到的作用[4。5]。是什么意思？

Restenosis after percutaneous coronary intervention in treatment of most common phenomenon is the formation of in-stent for vascular smooth muscle cell migration, proliferation and secretion of extracellular matrix and result in excessive thickening of neointima, which cause lies in the inner membrane integrity is damaged, damaged endothelial cells, exposed collagen in films [3]. Endothelial cell's role in the process of re-stenosis after PCI awareness gradually people started concern in prevention of Restenosis after PCI in endothelial cells role played by [4. 5].