PGAM1 and ovarian cancer: Dual‐luciferase experiment results further confirmed that miR‐542‐3p is bound to circ‐PGAM1, indicating that circ‐PGAM1 in ovarian cancer cells acted as an miRNA sponge to compete for miR‐542‐3p binding sites through the ceRNA mechanism to regulate miR‐542‐3p activity.