SLC7A11 and thyroid cancer: In addition, the levels of Fe2+, iron, and ROS were enhanced by circ_0067934 knockdown, while SLC7A11 overexpression reversed this effect in FTC133 and TPC-1 cells (Figures 7B–D), indicating that circ_0067934 represses ferroptosis of thyroid cancer cells by inducing SLC7A11.