After HNF4A was silenced and overexpressed in the endometriosis cell line hEM15A, Western blot analysis displayed that in comparison with the sh‐NC group, the expression of HNF4A and ARID1A in the sh‐HNF4A group was remarkably decreased, whereas the protein expression of HNF4A and ARID1A in the oe‐HNF4A group was prominently increased compared with the oe‐NC group (Figure 5F). This evidence concerns the gene HNF4A and endometriosis.