For example, one feature of the eutopic endometrium in women with endometriosis is unusual infiltration of CD138(+) ESPCs and CD20(+)/CD5(+)/HLA-DR(+) B cells; these are typical immunocompetent cells observed in CE, but are sparse in the nonpathological endometrium [4]. This evidence concerns the gene SDC1 and cholesteryl ester measurement.