Paclitaxel is an antimitotic agent that acts on the microtubule apparatus of the cell. It stimulates the assembly of microtubules from tubulin dimers and stabilizes them, preventing depolymerization. As a result, the normal process of dynamic reorganization of microtubule networks, which is important for cellular functions during interphase and mitosis, is disrupted. In addition, paclitaxel causes the formation of abnormal clusters or “bundles” of microtubules during the cell cycle, as well as multiple “stars” of microtubules during mitosis.