They can also regulate ferroptosis in tumor cells: MiR-137 regulates ferroptosis by targeting the glutamine transporter SLC1A5 in melanoma39 (Fig. 8); MiR-9 regulates ferroptosis in melanoma by targeting glutamic oxaloacetate transaminase52; MiR-214 plays an active role in enhancing erastin-induced ferroptosis by destroying the ATF4 imbalance in hepatoma cells53. Here, ATF4 is linked to neoplasm.