MALAT1 and gastric cancer: In 2020, when investigating the autophagy activity of GC tissues, researchers found that MALAT1 can inhibit the expression of miR-204 in GC cells and prevent miR-204 from down-regulating LC3B and transient receptor potential melastatin 3 (transient receptor potential melastatin 3), which activates autophagy and promotes cell proliferation [120].