In addition to the p300 stabilization induced by USP24 in cancer cells to regulate IL-6 expression through increased histone H3 acetylation, USP24 also reduces DNA methylation in the promoter region of IL-6 in lung cancer cells, but not in M2 macrophages, to increase IL-6 transcription by decreasing DNMT1 protein stability. Here, DNMT1 is linked to cancer.