KDM3A and lung cancer: Moreover, compared with cells treated by oe‐KDM3A + EV‐inhibitor‐NC, the expression of let‐7i in cells treated by oe‐KDM3A + EV‐let‐7i inhibitor was remarkably reduced, KDM3A was evidently up‐regulated, and the proliferation, migration and invasion abilities of lung cancer cells were enhanced (Figure 3H‐K).