SDC1 and cholesteryl ester measurement: With the eutopic endometrial samples in the hysterectomized specimens, Cicinelli et al. [17] compared the prevalence of CE (one or more CD138(+) ESPCs in 10 HPFs, 100-fold magnification) in women with advanced endometriosis (stage IV according to the revised American Society for Reproductive Medicine classification) and those without endometriosis.