SULT1E1 and endometrial cancer: At the cellular level, SULT1E1 immunoreactivity was diminished (Utsunomiya et al., 2004) or was not detected (www.proteinatlas.org; Uhlén et al., 2015) in endometrial cancer, compared to normal endometrium, while in other studies, increased SULT1E1 staining has been observed in cancerous endometrium, compared to adjacent control endometrium (Xu et al., 2012).