In ectopic endometrium in patients with adenomyosis group, LPA1 staining was localized to the cytoplasm, membrances of the epithelial cells of the endometrial glands, LPA2, LPA4 and LPA5 staining were localized to the nuclei of both stromal and glandular cells, LPA3 was little in both stroma and epithelial cells. Here, LPAR5 is linked to adenomyosis.