Compared to endometrium from women without disease, women with adenomyosis had a significantly higher ectopic expression of DNMT1 (p = 3.2 × 10–6) and DNMT3B (p = 0.002) whereas DNMT3A (p = 4.1 × 10–6) was significantly reduced in both eutopic and ectopic endometrium. Here, DNMT1 is linked to adenomyosis.