求翻译：紫杉醇已被成功用于药物涂层支架，但紫杉醇药物涂层支架迟发性血栓形成事件增加[6]。可能与其对内皮细胞的毒性作用有关，尤其高浓度时：在1000 nmol/L时可以抑制一半（54.7%）的内皮细胞生长。是什么意思？

Paclitaxel has been successfully used for drug-coated stent, but late-paclitaxel drug eluting stent thrombosis increased [6]. May its toxic effect on endothelial cell-related, especially when high concentrations of: 1000 can be suppressed by half when nmol/L (54.7%) endothelial cell growth.