KCNQ4 and breast cancer: The Transwell assay demonstrated a significant decrease in the number of cells transfected with overexpressed KCNQ4 plasmid through the filter membrane compared to the control group, suggesting the inhibitory effect of KCNQ4 on the migration and invasion of MDA-MB-231 (Fig. 14H) and MDA-MB-468 (Fig. 14J) breast cancer cells.