31). This study observed the effect of growth factor addition, for instance, vascular endothelial growth factor (VEGF)-loaded flow into the cell. Based on the experiment, adding growing factors such as VEGF in the microfluidic chips may represent one driving force of cell migration. This information may help understand the migration of GBM cells and metastasis of cancerous tissue (Ref. 31). Here, VEGFA is linked to glioblastoma.